# DevTools.tools — full catalog

Listed tools: 502. Each URL is the canonical tool page. Input stays in the browser unless a tool needs a live lookup.
Short index: https://www.devtools.tools/llms.txt

## Color Tools

[Color Tools landing](https://www.devtools.tools/category/color-tools)

- [Color Blindness Simulator](https://www.devtools.tools/color-blindness-simulator): Simulate color vision deficiencies on colors and images in your browser.
- [Color Contrast Checker](https://www.devtools.tools/color-contrast-checker): Check color contrast ratios for WCAG AA/AAA compliance online.
- [Color Converter](https://www.devtools.tools/color-converter): Convert colors between multiple formats (HEX, RGB, HSL, HSV, CMYK, LAB) with color blindness simulation, named colors, and batch processing
- [Color Extractor](https://www.devtools.tools/color-extractor): Pick HEX, RGB, HSL, HSV and CMYK from any image in your browser.
- [Color Generator](https://www.devtools.tools/color-generator): Generate color palettes, analyze colors, and create gradients with this comprehensive color tool.
- [Color Mixer](https://www.devtools.tools/color-mixer): Mix two colors at any ratio, preview intermediate steps, and copy the result as HEX, RGB, or HSL.
- [Color Names Finder](https://www.devtools.tools/color-names): Look up CSS color names or find the closest named match to any HEX color using perceptual color distance.
- [CSS Filter Generator](https://www.devtools.tools/css-filter-generator): Advanced visual CSS filter generator with Instagram-style presets, custom image upload, drop-shadow effects, and multi-format export capabilities.
- [CSS Gradient Generator](https://www.devtools.tools/css-gradient-generator): Visual CSS gradient generator.
- [Gradient Palette Builder](https://www.devtools.tools/gradient-palette-builder): Build a multi-stop color palette with RGB, HSL, or OKLCH interpolation.
- [Image Palette Extractor](https://www.devtools.tools/image-palette-extractor): Extract dominant colors from an image locally in your browser.
- [OKLCH Color Converter](https://www.devtools.tools/oklch-color-converter): Convert OKLCH and LCH colors to HEX, RGB, HSL, and LAB.
- [OKLCH Gamut Gradient & Harmony Studio](https://www.devtools.tools/oklch-gamut-gradient-studio): Convert hex to OKLCH, create hue-aware gradients, map wide-gamut colors to sRGB, and generate complementary, triadic, and analogous harmonies.
- [Palette Accessibility Checker](https://www.devtools.tools/palette-accessibility-checker): Check every color pair in a palette against WCAG AA and AAA text contrast thresholds.
- [Random Palette Generator](https://www.devtools.tools/random-palette-generator): Generate five-color palettes with harmony modes and lockable swatches.
- [Shades & Tints Generator](https://www.devtools.tools/color-shades-generator): Generate shades, tints, tones, and a Tailwind-style scale from any color.

## Design Tools

[Design Tools landing](https://www.devtools.tools/category/design-tools)

- [Aspect Ratio Calculator](https://www.devtools.tools/aspect-ratio-calculator): Calculate image and video dimensions for any aspect ratio, including 16:9, 4:3, 1:1, and 9:16.
- [Border Radius Generator](https://www.devtools.tools/border-radius-generator): Create CSS border-radius values visually with live preview, custom corner controls, blob shapes, and one-click copy.
- [Box Shadow Generator](https://www.devtools.tools/box-shadow-generator): Generate CSS box-shadow values with live preview, blur, spread, offsets, colors, inset mode, and presets.
- [CSS Grid Generator](https://www.devtools.tools/css-grid-generator): Build CSS Grid layouts visually with columns, rows, gaps, and live preview.
- [CSS Spring Physics Generator](https://www.devtools.tools/css-spring-physics-generator): Turn stiffness, damping, mass, and velocity into CSS cubic-bezier springs.
- [Cubic Bezier / Easing Generator](https://www.devtools.tools/cubic-bezier-generator): Create CSS cubic-bezier easing functions visually.
- [Dummy Avatar Generator](https://www.devtools.tools/dummy-avatar-generator): Generate unique SVG avatars for mockups and placeholders using various illustration styles
- [Flexbox Playground](https://www.devtools.tools/flexbox-playground): Experiment with CSS Flexbox properties in a live preview.
- [Mesh Gradient Generator](https://www.devtools.tools/mesh-gradient-generator): Design beautiful, fluid mesh gradients with optional noise and grain textures.
- [OG Image Generator](https://www.devtools.tools/og-image-generator): Create Open Graph images for social media sharing.
- [Pixel Art Sprite Studio](https://www.devtools.tools/pixel-art-sprite-studio): Draw retro pixel art with symmetry and dithering, animate frames with onion skinning, and export PNG, GIF, APNG, sprite atlases or CSS animations.
- [Px to Rem](https://www.devtools.tools/px-to-rem): Convert px ↔ rem with a custom root size, bulk CSS lines, and copy-ready snippets.
- [shadcn/ui Theme Generator](https://www.devtools.tools/shadcn-theme-generator): Generate custom shadcn/ui themes with CSS variables for light and dark mode.
- [Tailwind Theme Builder](https://www.devtools.tools/tailwind-theme-builder): Build custom Tailwind CSS themes with color palettes and generate tailwind.config.ts output
- [Typography Anatomy & Variable Font Lab](https://www.devtools.tools/font-anatomy-variable-lab): Inspect glyph outlines, kerning and OpenType features, preview variable font axes live, and export CSS @font-face + font-variation-settings.

## Data Processing

[Data Processing landing](https://www.devtools.tools/category/data-processing)

- [Base64 Toolbox](https://www.devtools.tools/base64): Encode and decode Base64 text, files and images online.
- [C# to VB.NET Converter](https://www.devtools.tools/csharp-to-vbnet-converter): Translate C# classes, methods, variable declarations, if/else and loops into VB.NET with Dim, Sub/Function, Class/End Class.
- [CSV Data Viewer](https://www.devtools.tools/csv-data-viewer): View CSV as a table with delimiter options.
- [CSV to Chart](https://www.devtools.tools/csv-to-chart): Paste or upload CSV data and generate bar, line, pie, or doughnut charts.
- [CSV to JSON Converter](https://www.devtools.tools/csv-to-json): Convert CSV to JSON instantly with custom delimiters and header options.
- [CSV to Markdown Converter](https://www.devtools.tools/csv-to-markdown-converter): Convert CSV to a GitHub-Flavored Markdown table and Markdown tables back to CSV.
- [CSV to SQL Converter](https://www.devtools.tools/csv-to-sql): Convert CSV to SQL with inferred CREATE TABLE, multi-row INSERT, and ANSI/MySQL/Postgres quoting.
- [DB Migration Script Generator](https://www.devtools.tools/db-migration-script-generator): Generate ALTER and CREATE migration SQL from two CREATE TABLE schemas.
- [Diff Checker](https://www.devtools.tools/diff-checker): Compare two text blocks and highlight differences side-by-side
- [Ephemeris Calculator](https://www.devtools.tools/ephemeris-calculator): Calculate tropical zodiac degrees, right ascension and declination for the Sun, Moon and planets in your browser.
- [ER Diagram Generator](https://www.devtools.tools/er-diagram-generator): Turn CREATE TABLE DDL into ER diagrams with FK lines.
- [GraphQL Formatter & Validator](https://www.devtools.tools/graphql-formatter): Format, validate and beautify GraphQL queries with syntax highlighting
- [GZip Compressor](https://www.devtools.tools/gzip-tools): Compress and decompress text with Gzip, Deflate, or Deflate-raw directly in your browser.
- [HTML Encoder/Decoder](https://www.devtools.tools/html-encoder-decoder): Encode and decode HTML entities.
- [HTML to Text Converter](https://www.devtools.tools/html-to-text-converter): Convert HTML to plain text by removing all HTML tags and entities.
- [Java to Kotlin Converter](https://www.devtools.tools/java-to-kotlin-converter): Translate Java classes, methods, variable declarations, for loops and println into idiomatic Kotlin.
- [JSON ⇄ YAML Converter](https://www.devtools.tools/json-to-yaml): Convert JSON to YAML and YAML to JSON online.
- [JSON Formatter](https://www.devtools.tools/json-formatter): Format, validate and beautify JSON instantly in your browser.
- [JSON Lines Converter](https://www.devtools.tools/jsonl-converter): Convert JSON Lines (NDJSON) to a JSON array, or JSON back to NDJSON.
- [JSON Schema Builder](https://www.devtools.tools/json-schema-builder): Generate a JSON Schema or MongoDB $jsonSchema from a form.
- [JSON Schema Validator](https://www.devtools.tools/json-schema-validator): Validate JSON against a JSON Schema (draft-07 + formats).
- [JSON to CSV Converter](https://www.devtools.tools/json-to-csv-converter): Convert JSON to CSV online with nested object flattening and custom delimiters.
- [JSON to Protobuf Converter](https://www.devtools.tools/json-to-protobuf-converter): Turn a JSON sample into a proto3 schema: scalar types, nested messages, and repeated fields, snake_cased and numbered.
- [JSON5 Validator](https://www.devtools.tools/json5-validator): Validate and format JSON5 documents — comments, trailing commas, unquoted keys.
- [JSONPath Evaluator](https://www.devtools.tools/jsonpath-evaluator): Paste JSON and a JSONPath expression to instantly see all matched values.
- [List & CSV Deduplicator](https://www.devtools.tools/list-deduplicator): Free duplicate remover for lists and CSV files: dedupe by column, keep first occurrence, case and trim options.
- [Local Sidereal Time](https://www.devtools.tools/local-sidereal-time): Compute Julian Date, Greenwich Mean Sidereal Time and Local Sidereal Time from UTC and longitude.
- [MongoDB Query Builder](https://www.devtools.tools/mongodb-query-builder): Build MongoDB find filters and aggregate pipelines visually.
- [Moon Phase & Eclipse Predictor](https://www.devtools.tools/moon-phase-eclipse-predictor): Get moon age, illumination, the next new and full moons, and upcoming solar or lunar eclipses.
- [NoSQL Validator](https://www.devtools.tools/nosql-validator): Validate JSON documents against JSON Schema or MongoDB $jsonSchema.
- [Number Base Converter](https://www.devtools.tools/number-base-converter): Convert numbers between different bases: Binary, Octal, Decimal, and Hexadecimal
- [Planet Aspects & Retrogrades](https://www.devtools.tools/planet-aspects-retrograde): List conjunctions, squares, trines, oppositions and retrograde stations over a date range.
- [Plist JSON XML Converter](https://www.devtools.tools/plist-json-xml-converter): Convert Apple .plist files to JSON or JSON to XML plist instantly.
- [Python to JavaScript Converter](https://www.devtools.tools/python-to-javascript-converter): Translate Python print, if/elif/else, for, while, def, f-strings and lists into JavaScript instantly.
- [SOAP Formatter](https://www.devtools.tools/soap-formatter): Format and beautify SOAP XML request/response envelopes.
- [SQL Builder](https://www.devtools.tools/sql-tools/builder): Build SQL SELECT queries by dragging clause blocks — learn how each clause works and copy ready-to-run SQL for 11 dialects.
- [SQL Compare](https://www.devtools.tools/sql-tools/compare): Compare two SQL queries and highlight the differences side by side — normalizes formatting first so only real changes show.
- [SQL Formatter](https://www.devtools.tools/sql-tools): Format, beautify and minify SQL queries online — supports 11 dialects including PostgreSQL and MySQL.
- [SQL Performance Analyzer](https://www.devtools.tools/sql-performance-analyzer): Analyze a SQL query for performance anti-patterns and get a score plus ranked, actionable fixes.
- [Stored Procedure Formatter](https://www.devtools.tools/stored-procedure-formatter): Format stored procedures online for SQL Server, Oracle, and PostgreSQL.
- [Temperature Converter](https://www.devtools.tools/temperature-converter): Convert temperatures between Celsius, Fahrenheit, and Kelvin
- [Time Zone Converter](https://www.devtools.tools/timezone-converter): Convert time between different time zones worldwide with automatic DST handling
- [Timestamp Converter](https://www.devtools.tools/timestamp-converter): Convert between Unix timestamps and human-readable dates with timezone support, multiple formats, and comprehensive date analysis
- [TOML to JSON Converter](https://www.devtools.tools/toml-to-json-converter): Convert TOML to JSON and JSON back to TOML.
- [TOML Validator](https://www.devtools.tools/toml-validator): Validate TOML (Cargo.toml, pyproject.toml) and pretty-print it as JSON.
- [Twitter Card Validator](https://www.devtools.tools/twitter-card-validator): Paste HTML and inspect twitter: card meta tags.
- [TypeScript to JavaScript Converter](https://www.devtools.tools/typescript-to-javascript-converter): Remove TypeScript types online: annotations, interfaces, type aliases, generics, enums, and as-assertions become clean JavaScript.
- [URL Encoder/Decoder](https://www.devtools.tools/url-encoder-decoder): Encode and decode URLs and percent-encoding instantly.
- [Visual SQL Query Builder](https://www.devtools.tools/sql-query-builder): Build SQL SELECT queries visually — columns, WHERE, GROUP BY, ORDER BY, LIMIT.
- [WSDL Formatter](https://www.devtools.tools/wsdl-formatter): Format and beautify WSDL XML service descriptions.
- [XML Formatter & Validator](https://www.devtools.tools/xml-formatter): Format, beautify and validate XML documents online.
- [XML to JSON Converter](https://www.devtools.tools/xml-to-json-converter): Convert XML to JSON online instantly.
- [YAML to TOML Converter](https://www.devtools.tools/yaml-to-toml): Convert YAML configuration to TOML format with proper syntax and validation
- [YAML Validator](https://www.devtools.tools/yaml-validator): Validate and lint YAML online with line-numbered error messages and JSON preview.

## Text & Analysis

[Text & Analysis landing](https://www.devtools.tools/category/text-analysis)

- [Anagram Solver & Palindrome](https://www.devtools.tools/anagram-palindrome-analyzer): Normalize text for palindrome checks and privacy-preserving anagram analysis.
- [Binary Text Translator](https://www.devtools.tools/binary-text-translator): Convert text to binary or hex bytes and decode binary/hex back to text (UTF-8).
- [Case Converter & Text Formatter](https://www.devtools.tools/case-converter): Convert text between 14 different case formats including camelCase, snake_case, kebab-case with batch processing and advanced options
- [Character Frequency Analyzer](https://www.devtools.tools/character-frequency): Analyze character and letter frequencies, word count, line count and stats.
- [Find and Replace Text](https://www.devtools.tools/find-and-replace): Find and replace text online with optional regex, case-sensitive and multiline matching.
- [HTML to Markdown Converter](https://www.devtools.tools/html-to-markdown): Convert HTML to Markdown and strip scripts, styles, nav and noise for LLM context.
- [Keyword Extractor](https://www.devtools.tools/keyword-extractor): Extract ranked keywords with TF-IDF locally.
- [Log Parser](https://www.devtools.tools/log-parser): Turn Apache, Nginx, and syslog lines into structured rows.
- [Markdown Linter](https://www.devtools.tools/markdown-linter): Check Markdown for common style problems — skipped heading levels, trailing whitespace, hard tabs, missing space after #, trailing heading punctuation, long…
- [Markdown to HTML / JSX Converter](https://www.devtools.tools/markdown-to-html-converter): Convert Markdown to HTML or React JSX with GFM tables, task lists, syntax highlighting, and sanitization.
- [Markdown to Plain Text](https://www.devtools.tools/markdown-to-plain-text): Strip Markdown formatting to clean, readable plain text — removes headings, bold/italic, links, images, code fences, blockquotes, and list markers while…
- [Readability Score](https://www.devtools.tools/readability-score): Measure how easy your writing is to read with Flesch Reading Ease, Flesch–Kincaid Grade Level, and the Gunning Fog index — plus word, sentence, and syllable…
- [Regex Explainer](https://www.devtools.tools/regex-explainer): Break down a regular expression into a plain-English, token-by-token explanation with a live match preview and a library of common patterns
- [Regex Tester](https://www.devtools.tools/regexp-tester): Test JavaScript regular expressions with live matches, capture groups, flags, and replace previews.
- [ROT13 Cipher](https://www.devtools.tools/rot13-cipher): Encode and decode text with ROT13 or a configurable Caesar shift (1–25).
- [String Escape Utilities](https://www.devtools.tools/string-escape): Escape and unescape strings for HTML, JavaScript, JSON, SQL, URL, and other formats with batch processing
- [Subtitle Shift & Cleaner](https://www.devtools.tools/subtitle-tools): Free online tool to fix out-of-sync SRT and VTT subtitles.
- [Text Cleaner & Normalizer](https://www.devtools.tools/text-cleaner): Clean, normalize, and format text with whitespace cleanup, line ending conversion, HTML removal, and comprehensive text processing
- [Text Sentiment Analyzer](https://www.devtools.tools/text-sentiment-analyzer): Score text sentiment locally with AFINN.
- [Text Statistics Analyzer](https://www.devtools.tools/text-statistics): Comprehensive text analysis with word count, readability scores, frequency analysis, encoding detection, and detailed statistics
- [Text Summarizer](https://www.devtools.tools/text-summarizer): Summarize long text with extractive sentence scoring.
- [Unicode Character Inspector](https://www.devtools.tools/unicode-inspector): Inspect Unicode characters with detailed information: code points, escape sequences, HTML entities, CSS codes, and character properties.
- [Unicode Font Styler](https://www.devtools.tools/unicode-font-styler): Free fancy text generator: bold, script, fraktur, circled, small caps and 14 more Unicode styles for social bios.
- [Whisper Transcript Cleaner](https://www.devtools.tools/whisper-transcript-cleaner): Clean Whisper and voice AI transcripts while preserving subtitle timing

## Generators

[Generators landing](https://www.devtools.tools/category/generators)

- [ABA Routing Number Generator](https://www.devtools.tools/routing-number-generator): Generate mock US ABA routing numbers by Fed district and institution type.
- [Address Generator](https://www.devtools.tools/address-generator): Generate realistic addresses in the correct format for 21 countries — single-line, multi-line, JSON or HTML — plus a postcode validator.
- [ASCII Text Art Generator](https://www.devtools.tools/ascii-text-art): Generate ASCII art banners from text.
- [Credit Card Generator](https://www.devtools.tools/credit-card-generator): Generate Luhn-valid test credit card numbers for development and QA.
- [Crypto Address Generator](https://www.devtools.tools/crypto-address-generator): Generate mock Ethereum, Bitcoin, Solana and TRON addresses with EIP-55 and Bech32 checksums.
- [Driver's License Generator](https://www.devtools.tools/drivers-license-generator): Generate driver's license numbers in the correct format for 21 countries and all 50 US states, plus a format and Luhn validator — test data only, runs in your…
- [DUNS Number Generator](https://www.devtools.tools/duns-number-generator): Generate mock Dun & Bradstreet-shaped DUNS numbers for corporate test fixtures.
- [EAN / UPC Generator](https://www.devtools.tools/ean13-upc-generator): Generate EAN-13, UPC-A and GTIN-14 mock barcodes with GS1 Mod-10 check digits.
- [EIN Generator](https://www.devtools.tools/ein-generator): Generate IRS-prefix-compatible EIN test data with campus selection and JSON, CSV or SQL export.
- [Email Signature Generator](https://www.devtools.tools/email-signature-generator): Build a clean, cross-client HTML email signature — name, title, company, and contact links with an accent color and a live preview
- [Favicon Generator](https://www.devtools.tools/favicon-generator): Generate favicons (16x16, 32x32) from any image.
- [GST Number Generator](https://www.devtools.tools/gst-number-generator): Generate GSTIN, ABN, GST/HST and global GST test data with checksum checks.
- [HS Code Generator](https://www.devtools.tools/hs-code-generator): Generate mock Harmonized System and national tariff codes by category.
- [HTTP Status Code Reference](https://www.devtools.tools/http-status-code-reference): Quick reference for HTTP status codes
- [IBAN & SWIFT Validator](https://www.devtools.tools/iban-validator): Check IBAN length and MOD-97 check digits, format bank numbers and inspect SWIFT/BIC structure locally.
- [IBAN Generator](https://www.devtools.tools/iban-generator): Generate ISO 13616 mock IBANs with Mod 97-10 check digits.
- [IMEI Generator](https://www.devtools.tools/imei-generator): Generate mock IMEI and IMEI-SV numbers with TAC brands and Luhn check digits.
- [ISIN Generator](https://www.devtools.tools/isin-generator): Generate mock ISIN, CUSIP, SEDOL and WKN securities codes with the letter-aware Luhn check.
- [LEI Generator](https://www.devtools.tools/lei-generator): Generate mock LEI codes with LOU prefixes and Mod 97-10 check digits.
- [License Generator](https://www.devtools.tools/license-generator): Generate open-source license files — MIT, Apache 2.0, GPL 3.0, ISC, MPL 2.0, BSD-3-Clause and Unlicense — with year, holder and project filled in.
- [MAC Address Generator](https://www.devtools.tools/mac-address-generator): Generate mock MAC addresses with vendor OUI filters and unicast/multicast or locally administered bits.
- [Meta Tag Generator](https://www.devtools.tools/meta-tag-generator): Generate SEO-friendly <meta> tags for your website.
- [National Identity Generator](https://www.devtools.tools/national-identity-generator): Generate national ID test data for 18 countries, including TC Kimlik, SSN and CPF.
- [Phone Number Generator](https://www.devtools.tools/phone-number-generator): Generate phone numbers in the correct format per country — mobile, landline and toll-free — in international, national, raw or tel: format, plus a validator.
- [Privacy Policy Generator](https://www.devtools.tools/privacy-policy-generator): Generate a starter privacy policy for your website — fill in your company details and toggle sections for cookies, analytics, third-party services, GDPR, and…
- [PWA Manifest Generator](https://www.devtools.tools/pwa-manifest-generator): Create a web app manifest.json for a Progressive Web App — name, short name, theme and background colors, display mode, orientation, start URL, and icon entries
- [QR Code Generator](https://www.devtools.tools/qr-code-generator): Generate standard QR codes for URLs, Text, WiFi, Email, and more.
- [Robots.txt Generator](https://www.devtools.tools/robots-txt-generator): Generate a valid robots.txt for search engines and AI crawlers — allow/disallow rules per user-agent, crawl-delay, sitemap directive, and one-click presets to…
- [RSS Feed Generator](https://www.devtools.tools/rss-feed-generator): Build a valid RSS 2.0 feed XML from a channel title, link, description and a dynamic list of items — escape special characters and copy or download
- [Sitemap.xml Generator](https://www.devtools.tools/sitemap-xml-generator): Turn a list of URLs into a valid XML sitemap for search engines, with optional lastmod, changefreq, and priority per the sitemaps.org schema
- [Structured Data Generator](https://www.devtools.tools/structured-data-generator): Generate JSON-LD Schema markup (Article, Product, etc.) for Google SEO.
- [SWIFT / BIC Generator](https://www.devtools.tools/bic-swift-generator): Create mock SWIFT/BIC codes for QA.
- [Tax ID Validator](https://www.devtools.tools/tax-id-validator): Auto-detect and batch-validate global tax IDs with format and checksum explanations.
- [Tax Number Generator](https://www.devtools.tools/tax-number-generator): Generate valid tax identification numbers for testing (TR, US, SG, etc.)
- [Terms of Service Generator](https://www.devtools.tools/terms-of-service-generator): Generate a starter Terms of Service (Terms & Conditions) for your website or app — configurable clauses for accounts, payments, user content, and termination
- [TIN Generator](https://www.devtools.tools/tin-generator): Generate format and checksum-aware TIN test identifiers for global software QA.
- [Tracking Number Generator](https://www.devtools.tools/tracking-number-generator): Generate mock UPS, FedEx, USPS, DHL and UPU S10 tracking numbers with carrier checksums.
- [ULID & NanoID Generator](https://www.devtools.tools/ulid-nanoid-generator): Generate batches of modern unique IDs — ULID (sortable, Crockford base32) or NanoID (URL-friendly, configurable size and alphabet).
- [UUID Generator](https://www.devtools.tools/uuid-generator): Generate v1 and v4 UUIDs online for free.
- [VAT Number Generator](https://www.devtools.tools/vat-number-generator): Generate checksum-aware EU, UK and global VAT test numbers in JSON, CSV or SQL.
- [VAT Validator](https://www.devtools.tools/vat-validator): Batch-check VAT formats and checksums privately, then optionally verify EU registrations with VIES.
- [VIN Generator](https://www.devtools.tools/vin-generator): Generate mock vehicle identification numbers with WMI, model year and NHTSA Mod-11 check digit.

## Security Tools

[Security Tools landing](https://www.devtools.tools/category/security-tools)

- [AES Encryption](https://www.devtools.tools/aes-encryption): Encrypt and decrypt text with AES-GCM and a passphrase, fully in your browser.
- [Basic Auth Generator](https://www.devtools.tools/basic-auth-generator): Generate an HTTP Basic Authentication header from a username and password.
- [Bcrypt Generator & Verifier](https://www.devtools.tools/bcrypt-generator): Hash passwords with bcrypt and verify hashes — choose your cost factor (rounds 4–15), get a secure hash instantly, and check whether a password matches a hash.
- [BIP39 Mnemonic Generator](https://www.devtools.tools/bip39-mnemonic-generator): Generate BIP39 seed phrases (12–24 words) and validate mnemonics with checksum.
- [Checksum Calculator](https://www.devtools.tools/checksum-calculator): Compute SHA-1, SHA-256, SHA-384 and SHA-512 checksums of a file.
- [Client-Side File Encryptor](https://www.devtools.tools/file-encryptor-aes): Free client-side file encryption: AES-256-GCM + PBKDF2, .dte format, works offline, nothing uploaded.
- [CORS Header Validator](https://www.devtools.tools/cors-validator): Validate Cross-Origin Resource Sharing headers for security compliance
- [CORS Policy Builder](https://www.devtools.tools/cors-policy-builder): Build CORS response headers, Nginx directives, and JavaScript fetch examples for safe cross-origin requests and preflight handling
- [Credit Card Validator](https://www.devtools.tools/credit-card-validator): Validate credit card numbers with the Luhn algorithm and identify the issuer, including Visa, Mastercard, and Amex.
- [CSP Builder & Validator](https://www.devtools.tools/csp-builder): Build a Content-Security-Policy visually or audit an existing header for unsafe-inline, wildcards and missing directives.
- [CSR Decoder](https://www.devtools.tools/csr-decoder): Decode a PEM Certificate Signing Request (PKCS#10) in your browser — inspect its subject, public key, signature algorithm and subject alternative names.
- [Email Validator](https://www.devtools.tools/email-validator): Validate email addresses with RFC 5322 syntax checking, disposable/temporary email detection, and domain verification.
- [EXIF & Metadata Stripper](https://www.devtools.tools/exif-metadata-stripper): Free EXIF remover: strip GPS, camera and hidden metadata from JPG and PNG with a full removal report.
- [GPG Symmetric Encryption](https://www.devtools.tools/gpg-symmetric-encryption): Passphrase encrypt/decrypt with AES-GCM armored output.
- [Hash Comparison Tool](https://www.devtools.tools/hash-comparison): Compare hashes and verify checksums online.
- [Hash Generator](https://www.devtools.tools/hash-generator): Generate MD5, SHA-1, SHA-256 and SHA-512 hashes online.
- [HMAC Generator](https://www.devtools.tools/hmac-generator): Generate HMAC signatures (SHA-1, SHA-256, SHA-384, SHA-512) from a message and secret key using the Web Crypto API.
- [HTTP Security Header Checker](https://www.devtools.tools/http-security-header-checker): Audit pasted HTTP response headers for HSTS, CSP, clickjacking, MIME sniffing, referrer, permissions, and opener protections
- [JavaScript Obfuscator](https://www.devtools.tools/js-obfuscator): Obfuscate and minify JavaScript code to protect your source code.
- [JWT Signer](https://www.devtools.tools/jwt-signer): Create and sign JSON Web Tokens with HMAC, RSA, or ECDSA algorithms using the Web Crypto API.
- [JWT Token Decoder](https://www.devtools.tools/jwt-decoder): Decode and inspect JSON Web Tokens (JWT) online.
- [JWT Validator](https://www.devtools.tools/jwt-validator): Validate JWT signatures and exp/nbf/aud/iss claims online.
- [Password Breach Checker](https://www.devtools.tools/password-breach-checker): Check if your password has been exposed in known data breaches using the HIBP database
- [Password Generator](https://www.devtools.tools/password-generator): Generate secure passwords with customizable options including length, character sets, and complexity requirements
- [Password Strength Checker](https://www.devtools.tools/password-strength-checker): Analyze password security with real-time strength scoring and recommendations
- [PEM Certificate Inspector](https://www.devtools.tools/pem-certificate-inspector): Paste a PEM certificate or private key and inspect subject, issuer, validity, serial, public-key size and SANs.
- [PKI Key Pair Generator](https://www.devtools.tools/pki-key-pair-generator): Generate RSA keys, self-signed X.509 certs and CSRs online.
- [Security Headers Checker](https://www.devtools.tools/security-headers-checker): Live GET request grades HSTS, CSP, X-Frame-Options and more.
- [Security.txt Generator](https://www.devtools.tools/security-txt-generator): Generate an RFC 9116 security.txt with Contact, Expires, Encryption, Acknowledgments, Policy and more so researchers know how to report vulnerabilities to you
- [Self-Destructing Encrypted Note](https://www.devtools.tools/burn-note-generator): Free burn note generator: AES-256 one-time messages, key in the URL fragment servers never see, optional password, zero uploads.
- [SQL Injection Detector](https://www.devtools.tools/sql-injection-detector): Detect SQL injection patterns in an input or query.
- [SSH Key Pair Generator](https://www.devtools.tools/ssh-key-pair-generator): Generate SSH key pairs online: OpenSSH public key, PEM private key, SHA256 fingerprint.
- [SSL Chain Analyzer](https://www.devtools.tools/ssl-chain-analyzer): Verify a PEM certificate chain order, find missing intermediates, broken links, expired certs and duplicates.
- [Text Encryptor](https://www.devtools.tools/text-encryptor): Encrypt and decrypt text with a passphrase using AES-256-GCM and PBKDF2 key derivation — everything happens in your browser, nothing is uploaded or stored
- [TLS Handshake Simulator](https://www.devtools.tools/tls-handshake-simulator): Animated TLS 1.2 handshake tutorial in your browser.
- [Token Generator](https://www.devtools.tools/token-generator): Generate cryptographically secure random tokens, API keys and secrets.
- [TOTP / 2FA Generator](https://www.devtools.tools/totp-generator): Generate and verify TOTP two-factor authentication codes with QR code export

## Network & API Tools

[Network & API Tools landing](https://www.devtools.tools/category/network-api-tools)

- [API Mock Server](https://www.devtools.tools/api-mock-server): Mock REST APIs with a client-side fetch interceptor.
- [Bandwidth Calculator](https://www.devtools.tools/bandwidth-calculator): Estimate how long a file takes to transfer at a given connection speed — correctly handling bits vs bytes (Mbps vs MB/s) and SI vs binary size units
- [Broken Link Checker](https://www.devtools.tools/broken-link-checker): Find broken links in pasted HTML with client-side extraction.
- [cURL to Code Converter](https://www.devtools.tools/curl-to-code-converter): Convert cURL commands into JavaScript, Python, PHP, Go, Java, and more.
- [DNS Lookup Tool](https://www.devtools.tools/dns-lookup): Query DNS records and resolve domain names to IP addresses
- [DNS Propagation Checker](https://www.devtools.tools/dns-propagation): Query Cloudflare, Google, Quad9 and more in parallel.
- [Email Header Analyzer](https://www.devtools.tools/email-header-analyzer): Parse email headers to trace the Received hops and check SPF, DKIM and DMARC results.
- [HTTP Header Builder](https://www.devtools.tools/http-header-builder): Assemble HTTP request headers from a form and export them as a raw request block, a curl command, or a JavaScript fetch() call
- [HTTP Header Parser](https://www.devtools.tools/http-header-parser): Paste raw HTTP request or response headers and get a clean, structured breakdown with explanations for common headers like Cache-Control, CORS and security…
- [HTTP Request Builder](https://www.devtools.tools/http-request-builder): Test APIs and HTTP endpoints with customizable requests
- [IP Address Lookup](https://www.devtools.tools/ip-address-lookup): Comprehensive IP geolocation lookup with detailed analysis, bulk processing, history tracking, and security insights
- [IP Intelligence](https://www.devtools.tools/ip-intel): Check reverse DNS, Team Cymru ASN data, and Spamhaus ZEN listing for any public IP.
- [IPv6 Address Expander](https://www.devtools.tools/ipv6-expander): Expand a compressed IPv6 address to its full 8-group form and compress it back per RFC 5952 — with validation, embedded-IPv4 support, and a per-group breakdown
- [MX Record Lookup](https://www.devtools.tools/mx-lookup): Inspect MX (Mail Exchanger) records, priority preferences, and email provider detection
- [Network Info](https://www.devtools.tools/network-info): View browser network info and optional public IP.
- [NS Record Lookup](https://www.devtools.tools/ns-lookup): Inspect Name Server (NS) DNS records and authoritative DNS provider configurations
- [Open Graph Debugger](https://www.devtools.tools/open-graph-debugger): Inspect og:title, og:description, og:image, and other Open Graph tags from pasted HTML.
- [Port Reference](https://www.devtools.tools/port-reference): Search 100+ common TCP and UDP ports with service names and IANA status.
- [Port Scanner Guide](https://www.devtools.tools/port-scanner-guide): Learn about port scanning ethics and alternatives.
- [Postman Collection Builder](https://www.devtools.tools/postman-collection-builder): Generate Postman v2.1 collections from a form.
- [Reverse DNS (PTR) Lookup](https://www.devtools.tools/reverse-dns-lookup): Perform reverse DNS lookups for IPv4 and IPv6 addresses using DNS-over-HTTPS
- [SSL Certificate Checker](https://www.devtools.tools/ssl-certificate-checker): Analyze SSL/TLS certificates for any domain, check expiration dates, certificate chains, and security details
- [SSL/TLS Deep Inspector](https://www.devtools.tools/ssl-inspector): Inspect TLS handshakes for any hostname.
- [Subdomain Explorer](https://www.devtools.tools/subdomain-explorer): Find subdomains from crt.sh CT logs.
- [Subnet Calculator](https://www.devtools.tools/subnet-calculator): Calculate IPv4 and IPv6 subnets from CIDR notation — network address, broadcast, usable host range, subnet mask, wildcard mask, and a visual bit map
- [TXT Record & SPF/DKIM Checker](https://www.devtools.tools/txt-lookup): Query TXT records and analyze SPF, DKIM, and DMARC email authentication security policies
- [URL Parser](https://www.devtools.tools/url-parser): Parse a URL into protocol, host, path, query and hash, and decode query parameters.
- [URL Redirect Chain Checker](https://www.devtools.tools/url-redirect-chain-checker): Trace redirect chains and final URLs.
- [User Agent Parser](https://www.devtools.tools/user-agent-parser): Parse User-Agent strings to identify browser, OS and device.
- [Webhook Tester](https://www.devtools.tools/webhook-tester): Test webhooks with POST requests to localhost or public URLs.
- [WebSocket Frame Parser](https://www.devtools.tools/websocket-frame-parser): Parse WebSocket frames from hex in your browser.
- [WHOIS Lookup](https://www.devtools.tools/whois-lookup): Lookup domain registration information including registrar, creation date, expiration date, and name servers.

## Development Utilities

[Development Utilities landing](https://www.devtools.tools/category/development-utilities)

- [.env Secret Safety Linter](https://www.devtools.tools/env-secret-leak-linter): Parse .env files, report line-level syntax errors, detect common API keys and high-entropy secrets, and create a clean template locally.
- [.htaccess Generator](https://www.devtools.tools/htaccess-generator): Create an Apache .htaccess with HTTPS redirects, rewrite rules, error pages, security headers, and basic auth.
- [2D Fluid Dynamics & Particle Physics Sandbox](https://www.devtools.tools/fluid-particle-sandbox): Paint dye into a real Navier-Stokes fluid and play with Verlet particles, gravity wells and springs — then export Matter.js, PixiJS or vanilla Canvas code.
- [AI Function Calling Schema Generator](https://www.devtools.tools/function-calling-schema-generator): Convert TypeScript interfaces into deterministic OpenAI, Anthropic, and Gemini function calling schemas in your browser.
- [Algorithm Arena & Data Structure Visualizer](https://www.devtools.tools/algorithm-arena-visualizer): Race QuickSort vs MergeSort, step A* and Dijkstra through mazes, and watch AVL and Red-Black trees rebalance.
- [Ansible Playbook Generator](https://www.devtools.tools/ansible-playbook-generator): Create an Ansible playbook from hosts, vars, and tasks with modules.
- [Apache Config Generator](https://www.devtools.tools/apache-config-generator): Create an Apache 2.4 VirtualHost with ServerName, DocumentRoot, Directory block, aliases, and optional SSL.
- [Arrow IPC Stream Viewer](https://www.devtools.tools/arrow-ipc-stream-viewer): Create Arrow tables from JSON or open local IPC and Feather files to inspect schema, row count, and preview rows without uploading data.
- [ASN.1 DER/BER Decoder](https://www.devtools.tools/asn1-der-decoder): Inspect ASN.1 Tag-Length-Value structures, OIDs, integers, UTC times, offsets, and BER indefinite lengths locally.
- [Audio Waveform to SVG](https://www.devtools.tools/audio-waveform-to-svg): Decode audio in the browser and generate deterministic bar, line, or area SVG waveform paths.
- [Avro Schema to TypeScript](https://www.devtools.tools/avro-schema-typescript): Convert Avro records, unions, arrays, maps, enums, fixed and logical types into TypeScript and JSON Schema locally.
- [AWS Architecture Diagram](https://www.devtools.tools/aws-architecture-diagram): Sketch AWS architectures with EC2, S3, Lambda and more.
- [AWS IAM Least-Privilege Generator](https://www.devtools.tools/aws-iam-least-privilege): Create deterministic AWS IAM policy JSON with curated actions, resource ARN placeholders, and optional conditions.
- [AWS Pricing Calculator](https://www.devtools.tools/aws-pricing-calculator): Estimate AWS monthly costs for EC2, S3, Lambda and more.
- [Azure Architecture Diagram](https://www.devtools.tools/azure-architecture-diagram): Build Azure architecture diagrams with VMs, App Service, AKS and more.
- [Azure ARM Template Generator](https://www.devtools.tools/azure-arm-template-generator): Build Azure Resource Manager JSON templates with storage, App Service and Key Vault presets.
- [B-Tree & B+ Tree Index Visualizer](https://www.devtools.tools/btree-index-visualizer): Explore deterministic B-tree and B+ tree inserts, splits, linked leaves, and search paths in your browser.
- [Backtracking Solver Lab](https://www.devtools.tools/backtracking-solver-lab): Solve Sudoku with MRV heuristics and explore N-Queens solutions with deterministic client-side backtracking.
- [Bash POSIX Portability Checker](https://www.devtools.tools/bash-posix-portability-checker): Detect common Bash-only syntax and get POSIX shell alternatives locally in your browser.
- [Batch Regex Replace Simulator](https://www.devtools.tools/batch-regex-replace-simulator): Simulate regex replacements across multiple files with capture groups, match counts, and before/after previews in your browser.
- [Big-O Complexity Comparator](https://www.devtools.tools/big-o-complexity-comparator): Visualize O(1), log n, n, n log n, n², n³, 2ⁿ and n!
- [Birthday Paradox Hash Collision Calculator](https://www.devtools.tools/birthday-paradox-hasher): Calculate hash collision probabilities and 50% thresholds for MD5, SHA-1, SHA-256, and custom hash bit lengths locally.
- [Bitwise & IEEE-754 Explorer](https://www.devtools.tools/bitwise-ieee754-explorer): Visualize sign, exponent and mantissa bits for f32 and f64 values, with client-side AND, OR, XOR, NOT, shift and rotate operations.
- [Bloom & Cuckoo Filter Simulator](https://www.devtools.tools/bloom-cuckoo-filter-simulator): Visualize Bloom bits, compare theoretical and measured false positives, and inspect Cuckoo kick chains locally.
- [Browser Compatibility Checker](https://www.devtools.tools/browser-compatibility-checker): Check Baseline web feature support across Chrome, Firefox, and Safari.
- [BSON to JSON & Hex Decoder](https://www.devtools.tools/bson-hex-converter): Convert BSON and JSON in your browser and inspect byte offsets, hexadecimal values, and ASCII output.
- [Caddyfile Builder](https://www.devtools.tools/caddyfile-builder): Build Caddy reverse proxy, file server, headers, redirects, compression, and auth configuration in your browser, then validate common syntax errors.
- [Cellular Automata Studio](https://www.devtools.tools/cellular-automata-studio): Run Game of Life, Wireworld circuits, Langton's Ant and Wolfram's Rule 110 — toroidal grids, heatmaps, RLE import/export, GIF recording.
- [CHANGELOG Generator](https://www.devtools.tools/changelog-generator): Write a clean, consistent CHANGELOG entry in the Keep a Changelog format from grouped Added, Changed, Deprecated, Removed, Fixed, and Security notes
- [Chmod Calculator](https://www.devtools.tools/chmod-calculator): Calculate Linux file permissions (777, 755 etc) easily.
- [Chmod Octal & Symbolic Permission Matrix](https://www.devtools.tools/chmod-symbolic-octal-matrix): Calculate chmod octal and symbolic permissions, SUID, SGID, sticky bits, and ls -l output privately in your browser.
- [CircleCI Config Generator](https://www.devtools.tools/circleci-config-generator): Create a CircleCI config with jobs, Docker images, and run steps wired into a workflow.
- [Cloud-Init Generator](https://www.devtools.tools/cloud-init-generator): Create Cloud-Init user-data with users, SSH keys, packages, files, and commands.
- [CloudFormation Template Generator](https://www.devtools.tools/cloudformation-template-generator): Generate AWS CloudFormation YAML with S3, Lambda, IAM, EC2 and DynamoDB presets.
- [Code Diff & Patch Generator](https://www.devtools.tools/code-diff-patch-generator): Compare text with an LCS diff, generate standard unified patches, and apply them with context validation locally in your browser.
- [Convex Hull Algorithm Visualizer](https://www.devtools.tools/convex-hull-visualizer): Compare Graham scan and Jarvis march step by step with interactive SVG points and seeded generation.
- [Cron Expression Builder](https://www.devtools.tools/cron-builder): Build and validate cron expressions with a visual editor and ready-made presets.
- [Crontab Natural Language & Next Runs Heatmap](https://www.devtools.tools/crontab-natural-language-heatmap): Convert cron expressions to English and inspect the next 50 daylight-saving-safe local run times with a 24-hour heatmap.
- [CSS Grid Named Areas Builder](https://www.devtools.tools/css-grid-named-areas-builder): Build valid CSS Grid named areas visually with rectangular-area validation, live CSS output, and an actual grid preview.
- [CSS Scroll-Driven Animations & Timeline Builder](https://www.devtools.tools/css-scroll-driven-animations): Build valid animation-timeline scroll and view CSS with progress, reveal, parallax, and stagger recipes.
- [CSS View Transitions API Animation Lab](https://www.devtools.tools/css-view-transitions-builder): Create valid view-transition-old and view-transition-new CSS with fade, slide, scale, flip, and morph presets.
- [CSS/JS Minifier](https://www.devtools.tools/css-js-minifier): Minify your CSS and JavaScript code to reduce file size.
- [CSV Type & Null Ratio Profiler](https://www.devtools.tools/csv-type-inference-profiler): Analyze CSV types, missing values, numeric statistics, unique values, and top values entirely in your browser.
- [Database Connection String Builder](https://www.devtools.tools/db-connection-string-builder): Build and URL-encode connection strings for PostgreSQL, MySQL, MongoDB, Redis and SQLite from a simple form — with JDBC and key/value variants
- [Date Calculator](https://www.devtools.tools/date-calculator): Calculate date differences and add/subtract days, weeks, months or years.
- [Design Tokens to Code](https://www.devtools.tools/design-tokens-to-code): Transform DTCG design token JSON into CSS variables, Tailwind v4 @theme, Tailwind config, or SwiftUI code with alias resolution and cycle detection.
- [Digital Logic Gate & Circuit Simulator](https://www.devtools.tools/logic-gate-circuit-simulator): Design digital logic circuits with gates, flip-flops and MUXes, simulate propagation delay live, then export truth tables, K-Maps, Verilog and VHDL.
- [Distributed Systems & Network Topology Simulator](https://www.devtools.tools/distributed-systems-simulator): Simulate load balancers, microservices, queues and databases, inject chaos, watch Raft split-brain and circuit breakers react, export Docker/K8s/Mermaid.
- [Docker Compose Builder](https://www.devtools.tools/docker-compose-builder): Build a valid docker-compose.yml visually — services, ports, volumes and env vars.
- [Docker Run to Compose Converter](https://www.devtools.tools/docker-run-to-compose-converter): Convert docker run commands to docker-compose.yml online.
- [Dockerfile Builder](https://www.devtools.tools/dockerfile-builder): Generate production-ready Dockerfiles with multi-stage builds, healthchecks, non-root users and .dockerignore.
- [Dockerfile Layer Optimizer](https://www.devtools.tools/dockerfile-layer-optimizer): Review Dockerfile layers, apt cache cleanup, pinned images, Docker cache behavior, and multi-stage build suggestions locally.
- [DuckDB WASM Playground](https://www.devtools.tools/duckdb-wasm-playground): Run DuckDB SQL queries against local CSV and JSON data entirely in your browser with WebAssembly.
- [Environment Variable Encoder/Decoder](https://www.devtools.tools/env-encoder): Encode, decode, and format environment variables for secure deployment
- [EXIF GPS Map Reverser](https://www.devtools.tools/exif-gps-map-reverser): Read JPEG EXIF GPS coordinates locally and visualize photo locations on an OpenStreetMap embed without uploading images.
- [FFT Fourier Decomposition](https://www.devtools.tools/fft-fourier-decomposition): Explore radix-2 FFT wave decomposition, magnitude and phase spectra, frequency peaks, and inverse FFT round-trips.
- [Figlet ASCII Typography & ANSI Banner Studio](https://www.devtools.tools/ascii-figlet-banner-designer): Design ASCII typography banners using embedded Standard, Slant, Small, Big, and Mini fonts with deterministic rendering and width warnings.
- [FSM & Turing Machine Simulator](https://www.devtools.tools/fsm-turing-simulator): Edit transition tables and run deterministic DFA or single-tape Turing machines with detailed traces.
- [GCP Architecture Diagram](https://www.devtools.tools/gcp-architecture-diagram): Create GCP architecture diagrams with GKE, Cloud Run, GCS and more.
- [GeoJSON to TopoJSON & WKT Converter](https://www.devtools.tools/geojson-topojson-converter): Convert GeoJSON to quantized TopoJSON, recover features, generate WKT, and inspect a bounding box locally.
- [GeoTIFF Boundary Extractor](https://www.devtools.tools/geotiff-boundary-extractor): Open a local GeoTIFF to inspect dimensions, bands, CRS and its calculated bounding box without uploading data.
- [Git Commit Message Builder](https://www.devtools.tools/git-commit-builder): Build conventional commit messages with type, scope, body, and breaking changes.
- [GitHub Actions Matrix & Runner Budget Calculator](https://www.devtools.tools/github-actions-matrix-calculator): Calculate GitHub Actions matrix combinations, concurrency waves, 256-job limit warnings, and OS-weighted runner minutes.
- [GitHub Actions YAML Generator](https://www.devtools.tools/github-actions-yaml-generator): Generate GitHub Actions workflow YAML from a visual form.
- [Gitignore Auditor](https://www.devtools.tools/gitignore-generator): Audit your .gitignore against official templates: see missing, redundant and outdated patterns for your stack and copy a corrected file.
- [Gitignore Generator](https://www.devtools.tools/gitignore-generator): Build a .gitignore from 55+ official github/gitignore templates, or audit an existing one to find missing, redundant and outdated patterns — pick your stack…
- [GitLab CI Generator](https://www.devtools.tools/gitlab-ci-generator): Create a GitLab CI pipeline from stages and jobs: images, scripts, artifacts, and branch rules.
- [GLSL Shader Art & Visual FX Playground](https://www.devtools.tools/glsl-shader-playground): Write GLSL with live WebGL2 rendering, Shadertoy uniforms, inline errors and an FPS counter — export Three.js, R3F or standalone HTML, record WebM.
- [GPIO Pinout Interactive Visualizer](https://www.devtools.tools/gpio-pinout-interactive): Interactive Raspberry Pi 40-pin, ESP32 30-pin, and Arduino Uno 20-pin GPIO pinout visualizer with function filters.
- [Grafana Panel Generator](https://www.devtools.tools/grafana-panel-generator): Create import-ready Grafana panels for Prometheus with field configuration, thresholds, options, and validated 24-column grid placement.
- [Hallucination Entropy Analyzer](https://www.devtools.tools/hallucination-entropy-analyzer): Calculate Shannon entropy, perplexity, surprise, and cumulative uncertainty from token probabilities entirely in your browser.
- [Helm Chart Generator](https://www.devtools.tools/helm-chart-generator): Generate Helm chart files: Chart.yaml, values.yaml and templated Deployment, Service, Ingress and helpers.
- [Helm Values Diff & Merge](https://www.devtools.tools/helm-values-diff-merge): Merge Helm values.yaml files with recursive maps, list replacement, null deletion semantics, and a deterministic diff table.
- [HTML Editor](https://www.devtools.tools/html-editor): Online HTML editor with live preview.
- [HTML Minifier](https://www.devtools.tools/html-minifier): Minify HTML online — strip comments and collapse whitespace while preserving pre/code/script.
- [HTML Table Generator](https://www.devtools.tools/html-table-generator): Generate a clean semantic HTML table from CSV data.
- [Huffman & Shannon-Fano Tree Visualizer](https://www.devtools.tools/huffman-shannon-tree): Compare Huffman and Shannon-Fano coding from text.
- [Hyperlink Generator](https://www.devtools.tools/hyperlink-generator): Generate HTML anchor (<a>) tags with target, rel, aria-label and class attributes.
- [IAM Policy Generator](https://www.devtools.tools/iam-policy-generator): Create AWS IAM policy JSON from Allow/Deny statements with actions and resources.
- [Interactive RegEx Railroad & DFA/NFA Stepper](https://www.devtools.tools/regex-railroad-dfa-stepper): Visualize regex as railroad diagrams and finite automata (NFA/DFA via Thompson construction), step through backtracking, count backtracks and detect ReDoS risk.
- [JavaScript AST Visualizer](https://www.devtools.tools/javascript-ast-visualizer): Parse JavaScript modules with Acorn and inspect a collapsible syntax tree, node type distribution, and JSON output locally.
- [Jenkins Pipeline Builder](https://www.devtools.tools/jenkins-pipeline-builder): Create a declarative Jenkins pipeline: agent, environment, stages with shell steps, and post actions.
- [JSON Schema to TypeScript](https://www.devtools.tools/json-schema-to-typescript): Convert JSON Schema to TypeScript interfaces with required fields, unions, enums, nested objects, $ref, and index signatures locally.
- [JSON to Go Struct](https://www.devtools.tools/json-to-go): Convert JSON into Go structs with correct types and JSON struct tags.
- [JSON to TypeScript](https://www.devtools.tools/json-to-typescript): Convert JSON into TypeScript interfaces instantly.
- [Karnaugh Map Solver](https://www.devtools.tools/karnaugh-map-solver): Solve 2–4 variable Karnaugh maps and generate minimal SOP and POS Boolean expressions with don't-care optimization.
- [Kubernetes Ingress Route Visualizer](https://www.devtools.tools/k8s-ingress-route-visualizer): Visualize Kubernetes Ingress hosts, paths, services, TLS, and pods as a deterministic Mermaid graph in your browser.
- [Kubernetes Manifest Generator](https://www.devtools.tools/kubernetes-manifest-generator): Build Kubernetes Deployment, Service, ConfigMap and Secret YAML visually.
- [Kubernetes Resource Calculator](https://www.devtools.tools/kubernetes-resource-calculator): Calculate K8s CPU/memory requests and generate Deployment YAML.
- [Lighthouse Audit Summary](https://www.devtools.tools/lighthouse-audit-summary): Turn a Lighthouse report into a prioritized action list.
- [Linux Sysctl Tuner](https://www.devtools.tools/linux-sysctl-tuner): Generate deterministic Linux sysctl.conf tuning values from RAM, bandwidth, RTT, and workload profile.
- [Lorem Ipsum Generator](https://www.devtools.tools/lorem-generator): Generate placeholder text in multiple styles for design and development
- [Lottie JSON Tweaker](https://www.devtools.tools/lottie-json-tweaker): Preview a Lottie animation and safely edit its embedded RGB colors without uploading JSON.
- [Markdown Artifacts Previewer](https://www.devtools.tools/markdown-artifacts-previewer): Paste LLM markdown to separate and preview SVG and HTML artifacts in a sandboxed iframe.
- [MessagePack & CBOR Inspector](https://www.devtools.tools/msgpack-cbor-inspector): Encode JSON as deterministic MessagePack or CBOR and inspect headers, offsets, hex bytes, and nested values locally.
- [MIME Type Detector](https://www.devtools.tools/mime-detector): Detect MIME types from file content, extensions, or data URIs.
- [Mock Data Generator](https://www.devtools.tools/mock-data-generator): Generate realistic test data in multiple formats for development and testing
- [Monorepo Dependency Graph Viewer](https://www.devtools.tools/monorepo-dep-graph-viewer): Paste pnpm workspace and package.json data to inspect internal and external dependencies, detect cycles, and generate Mermaid output in your browser.
- [Morse Code Translator](https://www.devtools.tools/morse-code-translator): Translate text to Morse code and decode Morse code back to text.
- [MP4 MOOV Atom Inspector](https://www.devtools.tools/mp4-moov-atom-inspector): Inspect ISO BMFF box order, MOOV placement, track metadata, and streaming readiness locally in your browser.
- [Multi-Language Code Editor](https://www.devtools.tools/multi-language-code-editor): Lightweight code editor with syntax highlighting.
- [Multiple URL Opener](https://www.devtools.tools/multiple-url-opener): Open many URLs in new tabs with delay.
- [NGINX Config Builder](https://www.devtools.tools/nginx-config-builder): Generate an NGINX server config from a visual form — reverse proxy, static hosting, SPA fallback, SSL termination and HTTP-to-HTTPS redirects
- [Nginx Reverse Proxy Wizard](https://www.devtools.tools/nginx-reverse-proxy-wizard): Build deterministic Nginx server blocks with weighted upstreams, WebSocket upgrades, SSL termination, gzip, and proxy timeouts.
- [Nomad to Kubernetes Converter](https://www.devtools.tools/nomad-to-k8s-converter): Convert Nomad job HCL into Kubernetes Deployment and Service manifests locally in your browser.
- [Offline Secret Leak Scanner](https://www.devtools.tools/offline-secret-leak-scanner): Scan multiple files for API keys, tokens, private keys, JWTs, and high-entropy secrets without uploading content.
- [Open Source License Compatibility Matrix](https://www.devtools.tools/license-compatibility-matrix): Check whether dependency licenses can be combined with your project license and understand attribution, source, patent, and network copyleft obligations.
- [OpenAPI / Swagger Editor](https://www.devtools.tools/openapi-swagger-editor): Parse and validate OpenAPI 3.x and Swagger 2.0 specs online.
- [OpenTelemetry Collector Builder](https://www.devtools.tools/opentelemetry-collector-builder): Configure deterministic OpenTelemetry Collector receivers, processors, exporters, and service pipelines in your browser.
- [Parquet File Viewer](https://www.devtools.tools/parquet-file-viewer): Open a local Parquet file to inspect columns, types, row count, and the first 20 rows without uploading data.
- [Programmer Calculator](https://www.devtools.tools/programmer-calculator): Multi-base calculator with simultaneous binary, octal, decimal and hex views, bitwise AND/OR/XOR/NOT/shift operations, and IEEE 754 float inspection
- [Prometheus Alert Rule Builder](https://www.devtools.tools/prometheus-alert-rule-builder): Create Prometheus alerting rules from alerts, PromQL expressions, durations, severity labels, and annotations.
- [Prompt Injection Sandbox](https://www.devtools.tools/prompt-injection-sandbox): Detect prompt injection, system prompt extraction, jailbreak, authority spoofing, and base64 payload patterns locally.
- [PromQL Builder & Validator](https://www.devtools.tools/promql-builder-validator): Compose PromQL rate, histogram quantile, grouping, offset, and alert rule YAML in a free client-side builder.
- [PromQL Query Builder](https://www.devtools.tools/promql-query-builder): Compose Prometheus PromQL queries visually: metric selectors, label matchers, rate/increase, sum/avg by, topk and offsets.
- [Protocol Buffers AST Explorer](https://www.devtools.tools/protobuf-ast-explorer): Parse .proto schemas into a browsable AST: messages, fields, enums, services, and RPCs with resolved type references.
- [Redis CLI Simulator](https://www.devtools.tools/redis-cli-simulator): Run Redis commands in your browser: strings, hashes, lists, sets, sorted sets, keys and expiry.
- [Redis RDB Memory Estimator](https://www.devtools.tools/redis-rdb-memory-estimator): Estimate Redis key-pattern memory with SDS overhead, compact encoding thresholds, collection overhead, global overhead, and replication backlog notes.
- [Regex to Code Generator](https://www.devtools.tools/regex-to-code): Convert regex patterns into ready-to-use code for JavaScript, Python, Go, Java, and PHP
- [RSS Feed Validator](https://www.devtools.tools/rss-feed-validator): Paste an RSS 2.0 or Atom feed to check well-formedness, required channel/entry fields, and missing items.
- [S3 Bucket Policy Generator](https://www.devtools.tools/s3-bucket-policy-generator): Build an AWS S3 bucket policy for a principal, a set of actions, and an optional key prefix.
- [Scientific & Engineering Calculator](https://www.devtools.tools/scientific-calculator): Free online scientific calculator with 64-digit precision, function graphing, matrix algebra, statistics and unit conversion.
- [Semantic Version Calculator](https://www.devtools.tools/semver-calculator): Parse, validate, compare and bump semantic versions (major/minor/patch/prerelease).
- [SemVer Range Intersection](https://www.devtools.tools/semver-range-intersection): Find the intersection of npm SemVer ranges (^, ~, comparators, x-ranges, hyphen ranges and OR) and check versions privately in your browser.
- [Service Worker Generator](https://www.devtools.tools/service-worker-generator): Generate service worker JS with precache lists and offline fallback.
- [Slug Generator](https://www.devtools.tools/slug-generator): Convert any text into URL-friendly slugs.
- [Social Media Card Simulator](https://www.devtools.tools/social-media-card-simulator): Inspect Open Graph and Twitter Card metadata and preview social link cards for three major platforms.
- [SQLite WASM Studio](https://www.devtools.tools/sqlite-wasm-studio): Run multiple SQLite statements with official SQLite WebAssembly, preview SELECT results, inspect schemas, and view foreign-key relationships without uploading…
- [SVG Displacement Filter Lab](https://www.devtools.tools/svg-displacement-filter-lab): Create valid deterministic SVG feTurbulence, displacement, blur, and color matrix filter chains with visual presets.
- [SVG Path Morpher](https://www.devtools.tools/svg-path-morpher): Morph between SVG paths with normalized cubic interpolation and export SMIL or CSS keyframes.
- [Synthetic Data Faker](https://www.devtools.tools/synthetic-data-faker): Generate repeatable JSON, JSONL, and CSV synthetic datasets locally from a JSON Schema with a seeded random generator.
- [Systemd Service & Timer Builder](https://www.devtools.tools/systemd-service-builder): Build valid systemd .service and .timer units with restart policies, environment variables, calendars, and hardening options in your browser.
- [Tailwind Theme to CSS Variables](https://www.devtools.tools/tailwind-to-css-variables): Convert Tailwind theme.extend colors, font families, and spacing into CSS custom properties without evaluating JavaScript.
- [Terraform DAG Diagrammer](https://www.devtools.tools/terraform-dag-diagrammer): Parse Terraform resources and data blocks, find references and cycles, and export a deterministic Mermaid graph in your browser.
- [Terraform HCL Visualizer](https://www.devtools.tools/terraform-hcl-visualizer): Visualize Terraform HCL structure: resources, data, variables, outputs, modules and providers with attributes and inferred dependencies.
- [Traefik Router Generator](https://www.devtools.tools/traefik-router-generator): Build Traefik routers, services, and middleware YAML with Host, PathPrefix, TLS, authentication, rate limits, and load balancers.
- [Travis CI Config Generator](https://www.devtools.tools/travis-ci-config-generator): Create a Travis CI config: language, runtime versions, before_install, script, and an optional deploy step.
- [TSV Matrix Transposer & Normalizer](https://www.devtools.tools/tsv-matrix-transposer): Transpose, normalize, and repair delimited matrices entirely in your browser with deterministic results.
- [UART Baud Rate Error & Timing Calculator](https://www.devtools.tools/uart-baud-rate-calculator): Calculate serial frame timing, actual baud, divisor error, and reliability thresholds locally.
- [Unit Converter](https://www.devtools.tools/unit-converter): Convert length, weight, volume and area units online.
- [Unix Pipe Builder](https://www.devtools.tools/unix-pipe-builder): Build Unix command pipelines by chaining commands together with visual feedback
- [Vector Similarity Calculator](https://www.devtools.tools/vector-similarity-calculator): Compare vectors with cosine similarity, Euclidean distance, and dot product matrices, plus a deterministic PCA scatter plot in your browser.
- [Web Font Subsetter & Glyph Stripper](https://www.devtools.tools/font-subsetter-glyph-stripper): Inspect OTF, TTF, and WOFF sfnt tables, map used characters, estimate savings, and generate pyftsubset and CSS unicode-range output locally.
- [Web Vitals Budget Simulator](https://www.devtools.tools/web-vitals-budget-simulator): Model render-blocking resources, script execution, input delay, transfer time, and layout shifts against Core Web Vitals budgets.
- [Web Vitals Calculator](https://www.devtools.tools/web-vitals-calculator): Rate your Core Web Vitals — LCP, INP, and CLS — against Google's official good, needs-improvement, and poor thresholds, with an overall assessment
- [WireGuard Config Generator](https://www.devtools.tools/wireguard-config-generator): Build deterministic WireGuard client and multi-peer server configurations with local CIDR and key validation.

## Visual Tools

[Visual Tools landing](https://www.devtools.tools/category/visual-tools)

- [APCA Contrast Calculator](https://www.devtools.tools/apca-contrast-calculator): Measure Advanced Perceptual Contrast (APCA) for text and backgrounds, see typography-aware guidance, and compare WCAG 2.1 contrast.
- [Barcode Generator](https://www.devtools.tools/barcode-generator): Generate barcodes online in 8 formats: CODE128, EAN-13, UPC and more.
- [Base64 Image Encoder](https://www.devtools.tools/base64-image-encoder): Convert images to Base64 data URIs online with resizing and ready-to-use HTML/CSS/JS snippets.
- [CSS Container Queries Lab](https://www.devtools.tools/css-container-queries-lab): Create valid CSS container-name, container-type, and breakpoint @container rules for responsive cards, navigation, and tables.
- [EXIF Viewer & Cleaner](https://www.devtools.tools/exif-viewer): View and remove EXIF metadata from images.
- [Favicon Pack Generator](https://www.devtools.tools/favicon-pack-generator): Generate complete favicon packs with all standard sizes and Apple touch icons
- [Image Compressor](https://www.devtools.tools/image-compressor): Compress JPEG, PNG, and WebP images in your browser.
- [Image Format Converter](https://www.devtools.tools/image-format-converter): Convert images between different formats like PNG, JPG, WebP, and more
- [Image to ASCII Converter](https://www.devtools.tools/image-to-ascii): Convert any image to ASCII art.
- [Image to PDF Converter](https://www.devtools.tools/image-to-pdf): Free image to PDF converter: combine JPG and PNG into one PDF, reorder pages, A4/Letter or fit-to-image.
- [Image Watermarker](https://www.devtools.tools/image-watermarker): Free image watermarker: tiled or positioned text watermarks on JPG and PNG with live preview.
- [Markdown Previewer](https://www.devtools.tools/markdown-previewer): Preview Markdown rendered live as you type, with syntax highlighting.
- [Markdown Table Generator](https://www.devtools.tools/markdown-table-generator): Create Markdown tables visually or from CSV/Excel data.
- [Natal Chart](https://www.devtools.tools/natal-chart): Compute planet positions and house cusps from a birth time and place, then draw an SVG zodiac wheel.
- [OCR — Image to Text Extractor](https://www.devtools.tools/image-to-text-ocr): Free OCR extractor: pull text from screenshots, scans and photos with a self-hosted Tesseract engine.
- [PDF Signer & Annotator](https://www.devtools.tools/pdf-signer): Free PDF signer: draw your signature, position it on any page, download the signed PDF.
- [PDF to Image Converter](https://www.devtools.tools/pdf-to-image): Free PDF to image converter: render pages to PNG or JPG at 72–300 DPI, page ranges, self-hosted engine, fully private in your browser.
- [PDF Tools](https://www.devtools.tools/pdf-tools): Split and merge PDF files directly in your browser with local processing
- [QR Code Reader](https://www.devtools.tools/qr-code-reader): Read QR codes from camera or image with BarcodeDetector.
- [Responsive Tester](https://www.devtools.tools/responsive-tester): Preview any URL at phone, tablet and desktop widths.
- [Sidereal / Tropical Converter](https://www.devtools.tools/sidereal-tropical-converter): Apply Lahiri or Fagan/Bradley ayanamsa to tropical longitudes and chart how precession changes the offset from 1900 to 2100.
- [SVG Optimizer](https://www.devtools.tools/svg-optimizer): Optimize SVG files by removing unnecessary data to reduce file size while preserving visual quality
- [SVG Previewer](https://www.devtools.tools/svg-previewer): Paste SVG code to instantly preview the rendered image
- [SVG to PNG Converter](https://www.devtools.tools/svg-to-png-converter): Convert SVG to PNG online with custom size and background.
- [World Map](https://www.devtools.tools/world-map): Click into any country's states, provinces and districts on an interactive world map — paste data for a choropleth, then export SVG, PNG or GeoJSON.

## Creator & Business Tools

[Creator & Business Tools landing](https://www.devtools.tools/category/creator-business-tools)

- [Code Snippet to Image](https://www.devtools.tools/code-to-image): Create aesthetic, shareable images from your code snippets.
- [Creator Tax Form Guide](https://www.devtools.tools/creator-tax-form-guide): Build a private creator payout tax checklist for TikTok, YouTube, Twitch, Patreon and more.
- [Freelance Invoice Generator](https://www.devtools.tools/invoice-generator): Generate professional invoices in seconds without signing up.
- [Golden & Blue Hour](https://www.devtools.tools/golden-blue-hour): List sunrise, sunset, civil/nautical/astronomical twilight and golden or blue hour windows.
- [Hourly Rate Calculator](https://www.devtools.tools/hourly-rate-calculator): Calculate exactly how much you should charge per hour as a freelancer.
- [Social Frame Studio](https://www.devtools.tools/social-frame-studio): Create social-ready screenshots for LinkedIn, X, and Instagram with customizable gradients, window frames, and padding in your browser.
- [YouTube SEO Builder](https://www.devtools.tools/youtube-seo-builder): Create SEO-ready YouTube titles, descriptions, chapters, and tags with character-limit checks.
- [YouTube Thumbnail Downloader](https://www.devtools.tools/youtube-thumbnail): Preview and download YouTube thumbnails in every available size as JPG or ZIP.

## Media & Audio

[Media & Audio landing](https://www.devtools.tools/category/media-audio)

- [Audio Trimmer & Cutter](https://www.devtools.tools/audio-trimmer): Free audio trimmer: draggable waveform selection, precise timecodes, lossless WAV export.
- [Canvas WebM / Animated GIF Exporter](https://www.devtools.tools/canvas-webm-recorder): Animate an HTML canvas and export a local WebM recording or deterministic animated GIF without uploads.
- [Screen & WebCam Recorder](https://www.devtools.tools/screen-recorder): Free screen recorder: capture screen, webcam or both with a webcam bubble, tab audio, local MP4/WebM export.
- [Video to GIF Maker](https://www.devtools.tools/video-to-gif): Free video to GIF maker: trim clips, control FPS and size, palette-optimized output via self-hosted FFmpeg.
- [Voice Dictation](https://www.devtools.tools/voice-dictation): Free voice dictation: speak and see live text in 12 languages, browser speech engine, copy or download the transcript.

## Sound Tools

[Sound Tools landing](https://www.devtools.tools/category/sound-tools)

- [Ambient Noise Generator](https://www.devtools.tools/ambient-noise-generator): Free ambient noise generator: blend white, pink and brown noise live, sleep timer included.
- [Audio BPM Tap & Tempo Detector](https://www.devtools.tools/audio-bpm-tap-detector): Estimate BPM from beat taps or audio sample energy onsets.
- [Audio dBFS, dBu, dBV & Voltage Converter](https://www.devtools.tools/audio-db-level-converter): Convert dBFS, dBu, dBV, volts, and linear amplitude with professional +24 dBu and consumer -10 dBV full-scale references.
- [Binaural Noise Synthesizer](https://www.devtools.tools/binaural-noise-synthesizer): Generate deterministic binaural beat previews with Delta, Theta, Alpha, Beta, and Gamma presets and colored noise.
- [Metronome & Instrument Tuner](https://www.devtools.tools/metronome-instrument-tuner): Keep visual tempo and tune instruments around an adjustable A4 reference.
- [Morse Spectrogram Decoder](https://www.devtools.tools/morse-spectrogram-decoder): Convert text to ITU Morse, visualize WPM timing, synthesize sine-wave audio, and decode thresholded tone signals in your browser.
- [Text to Speech (TTS)](https://www.devtools.tools/text-to-speech): Free text to speech reader: browser voices, rate, pitch and volume control, sentence chunking.
- [Voice & Audio Recorder](https://www.devtools.tools/audio-voice-recorder): Record microphone audio locally and download a WebM recording when ready.
- [Web Audio Modular Synthesizer & Sound FX Generator](https://www.devtools.tools/web-audio-synth-studio): Design synth voices with ADSR, filters, LFO, overdrive, delay and reverb — play by mouse, keyboard or MIDI, watch the FFT, and export WAV or ready-to-paste…

## Financial Tools

[Financial Tools landing](https://www.devtools.tools/category/financial-tools)

- [Compound Interest Calculator](https://www.devtools.tools/compound-interest-calculator): Free compound interest calculator: initial amount, monthly contributions, compounding frequency, yearly schedule and chart.
- [Currency Converter](https://www.devtools.tools/currency-converter): Free currency converter with 30 currencies, offline snapshot rates and manual rate override.
- [Discount & VAT Calculator](https://www.devtools.tools/discount-vat-calculator): Calculate discounts with VAT or sales tax: VAT-inclusive and VAT-exclusive prices, quantity totals, TR KDV and EU presets.
- [FIRE & Retirement Calculator](https://www.devtools.tools/fire-retirement-calculator): Project a FIRE portfolio target using expenses, savings, contributions and return.
- [Loan & Mortgage Calculator](https://www.devtools.tools/loan-mortgage-calculator): Free loan and mortgage calculator: monthly payment, amortization schedule, extra payment savings and balance chart.
- [Savings Goal & Sinking Fund](https://www.devtools.tools/savings-goal-calculator): Calculate monthly sinking-fund contributions with return and inflation assumptions.
- [Subscription Expense Tracker](https://www.devtools.tools/subscription-expense-tracker): Review recurring monthly and yearly costs with local category totals.
- [Tip & Bill Splitter](https://www.devtools.tools/tip-bill-splitter): Free tip calculator and bill splitter: percentage or custom tip, per-person amounts and rounding that never leaves the total short.

## Productivity Tools

[Productivity Tools landing](https://www.devtools.tools/category/productivity-tools)

- [BMI & TDEE Calculator](https://www.devtools.tools/bmi-tdee-calculator): Free BMI calculator with WHO classification, healthy weight range, BMR (Mifflin-St Jeor) and TDEE calorie targets.
- [Habit & Streak Tracker](https://www.devtools.tools/habit-streak-tracker): Mark local calendar days and see a GitHub-style completion streak.
- [Pomodoro Focus Timer](https://www.devtools.tools/pomodoro-timer): Free online Pomodoro timer: configurable 25/5 cycles, long breaks, sound chimes, notifications and drift-proof background accuracy.
- [Typing Speed Test](https://www.devtools.tools/typing-speed-test): Free typing speed test with live WPM, accuracy and per-character feedback.

## Device & Sensors

[Device & Sensors landing](https://www.devtools.tools/category/device-sensors)

- [Digital Bubble Level](https://www.devtools.tools/bubble-level): Measure surface tilt with a visual bullseye and a ±0.2° level threshold.
- [Digital Compass](https://www.devtools.tools/digital-compass): Read a device heading with a manual desktop simulator and magnetic interference guidance.
- [Flashlight & Signal Beacon](https://www.devtools.tools/flashlight): Use a phone LED or bright screen as a flashlight with dimming, blink patterns, SOS and Morse code signals.
- [GPS Speedometer](https://www.devtools.tools/gps-speedometer): Track speed and distance from GPS with a Haversine fallback when speed is null.
- [I2C & SPI Bus Timing Diagram](https://www.devtools.tools/i2c-spi-timing-diagram): Detect I2C address conflicts across 7-bit and 8-bit notation, compare SPI modes 0-3 with CPOL/CPHA timing diagrams, and size I2C pull-up resistors.
- [IoT Pil Ömrü Tahminleyici](https://www.devtools.tools/iot-battery-life-estimator): Estimate IoT battery life from active and deep-sleep current, sampling cycles, Peukert effect, and self-discharge.
- [PWM Duty Cycle & Motor RPM Calculator](https://www.devtools.tools/pwm-duty-cycle-motor): Calculate PWM on/off timing, average voltage, linear DC motor RPM, RC cutoff, and timer register frequency locally.
- [Resistor Color Code & SMD Decoder](https://www.devtools.tools/resistor-smd-calculator): Calculate resistor values from color bands, convert values back to colors, and decode SMD and EIA-96 markings in your browser.
- [Screen & Physical Ruler](https://www.devtools.tools/screen-ruler): Use a CSS pixel ruler and calibrate it against a known physical reference.
- [Smart Mirror & Ring Light](https://www.devtools.tools/smart-mirror): Turn the front camera into a private mirrored preview with no upload.
- [Sound & Decibel Meter](https://www.devtools.tools/decibel-meter): Estimate relative sound level from the microphone with an honest calibration disclaimer.

## Education & Science

[Education & Science landing](https://www.devtools.tools/category/education-science)

- [3D Affine Transform Visualizer](https://www.devtools.tools/matrix-affine-transform-3d): Build 4x4 affine transforms, chain translate/rotate/scale matrices, and preview a rotating cube wireframe.
- [Exam & Section Timer](https://www.devtools.tools/exam-section-timer): Plan multi-section exams with total duration and seconds-per-question pacing.
- [Flashcards & Spaced Repetition](https://www.devtools.tools/flashcard-study-deck): Review a flashcard with a transparent SuperMemo SM-2 scheduling algorithm.
- [GPA & Grade Calculator](https://www.devtools.tools/gpa-grade-calculator): Calculate credit-weighted GPA and simulate the semester average needed for a target.
- [Graph Shortest Path Lab](https://www.devtools.tools/graph-shortest-path-lab): Create a weighted graph and visualize deterministic Dijkstra, A*, and Bellman-Ford shortest-path steps locally.
- [Interactive Periodic Table](https://www.devtools.tools/interactive-periodic-table): Explore all 118 elements, filter them and preview phase changes by temperature.
- [Perlin & Simplex Terrain Generator](https://www.devtools.tools/perlin-simplex-terrain): Compare seeded Perlin and Simplex 2D noise with octave layering, terrain thresholds, palettes, and an SVG map.
- [RF Wavelength & Dipole Antenna Calculator](https://www.devtools.tools/rf-antenna-wavelength): Calculate RF wavelength, identify AM, FM, VHF, UHF and ISM bands, and size dipole antenna sections in your browser.
- [Wolfram 1D Cellular Automata](https://www.devtools.tools/wolfram-1d-automata): Simulate Rule 30, Rule 90, Rule 110, Rule 184 and every elementary cellular automaton with configurable boundaries.

## Daily & Lifestyle

[Daily & Lifestyle landing](https://www.devtools.tools/category/daily-lifestyle)

- [Clothing & Shoe Size Chart](https://www.devtools.tools/clothing-shoe-size-converter): Estimate international shoe and clothing sizes from physical measurements.
- [Fuel Cost & Trip Calculator](https://www.devtools.tools/fuel-cost-trip-calculator): Estimate round-trip litres and fuel cost from distance, consumption and price.
- [Human Design BodyGraph](https://www.devtools.tools/human-design-bodygraph): Compute personality and 88° design gates, type, profile and authority, then draw an SVG bodygraph locally.
- [Kitchen & Recipe Converter](https://www.devtools.tools/kitchen-unit-converter): Scale ingredient quantities by servings and convert common kitchen volumes.
- [Laundry Care Symbols Guide](https://www.devtools.tools/laundry-care-decoder): Understand common wash, bleach, dry, iron and professional-clean symbols.
- [Life in Weeks](https://www.devtools.tools/life-in-weeks): Draw about 4000 week cells from a birth date, see lived vs remaining time, and pin milestones.
- [Moon Gardening Calendar](https://www.devtools.tools/moon-gardening-calendar): See which days favor leafy, root, flower or fruit work from the moon phase and sign.
- [Numerology Analyzer](https://www.devtools.tools/numerology-analyzer): Compute Pythagorean or Chaldean Life Path, Destiny, Soul Urge and Personality numbers in your browser.
- [Passport & Visa 6-Month Rule](https://www.devtools.tools/visa-passport-validity-checker): Compare travel date and passport expiry against a configurable validity buffer.

## Health & Lifestyle

[Health & Lifestyle landing](https://www.devtools.tools/category/health-lifestyle)

- [Biorhythm Calculator](https://www.devtools.tools/biorhythm-calculator): Plot physical, emotional and intellectual biorhythms and mark critical days.
- [BMR & TDEE Calculator](https://www.devtools.tools/bmr-tdee-calculator): Estimate daily calories from age, height, weight and activity, then split protein, carbs and fat.
- [Intermittent Fasting Planner](https://www.devtools.tools/intermittent-fasting-planner): Plan 16:8, 14:10, 18:6, 20:4 or 5:2 eat/fast windows from sunrise and see ketosis or autophagy notes.
- [Pregnancy Due Date Calculator](https://www.devtools.tools/pregnancy-due-date-calculator): Estimate a due date from LMP using Naegele's rule for informational planning.
- [Sleep Cycle & REM Calculator](https://www.devtools.tools/sleep-cycle-calculator): Suggest sleep or wake times using adjustable cycle and sleep-onset duration.

## Randomness & Games

[Randomness & Games landing](https://www.devtools.tools/category/randomness-games)

- [3D Dice Roller & Coin Flip](https://www.devtools.tools/dice-roller-coin-flip): Roll tabletop dice expressions or flip a coin with browser randomness.
- [Decision Wheel & Picker](https://www.devtools.tools/decision-wheel): Choose fairly from a list using cryptographically strong browser randomness.
- [Random Number & Raffle Picker](https://www.devtools.tools/random-number-picker): Pick a secure random number or raffle entry entirely on your device.

## Games

[Games landing](https://www.devtools.tools/category/games)

- [2048](https://www.devtools.tools/2048): Play 2048 free in your browser: swipe or arrow keys, merge tiles to reach 2048, undo a move and auto-save your progress with the best score stored locally.
- [Memory Match](https://www.devtools.tools/memory-match): Play Memory Match free in your browser: flip cards, match all pairs across three grid sizes and beat your best moves and time.
- [Minesweeper](https://www.devtools.tools/minesweeper): Play Minesweeper free online: three difficulties, guaranteed-safe first click, flag mode for touch and chording.
- [Snake](https://www.devtools.tools/snake): Play Snake free in your browser: swipe or keyboard controls, speed levels, wrap mode and auto-pause when the tab hides.
- [Tetris](https://www.devtools.tools/tetris): Play Tetris free in your browser: ghost piece, hold queue, hard drop and touch controls with auto-saved runs.

## Time & Productivity

[Time & Productivity landing](https://www.devtools.tools/category/time-productivity)

- [Fullscreen Countdown Timer](https://www.devtools.tools/fullscreen-countdown-timer): Run an absolute timestamp countdown for presentations, study and events.
- [Precision Stopwatch](https://www.devtools.tools/stopwatch-lap-timer): Measure drift-free elapsed time and compare lap splits using performance.now.

## AI Tools

[AI Tools landing](https://www.devtools.tools/category/ai-tools)

- [Agent Tool Flowchart Builder](https://www.devtools.tools/agent-tool-flowchart-builder): Model AI agent tool-call chains as a flowchart: tool nodes, decision branches, and bounded loops.
- [AI Agent Memory & Buffer Simulator](https://www.devtools.tools/ai-agent-memory-simulator): Simulate agent context assembly, retrieval ranking, and approximate token costs in your browser.
- [AI API Client SDK Generator](https://www.devtools.tools/ai-sdk-generator): Generate production-ready TypeScript, Python, or Go API client SDKs from OpenAPI specifications and cURL requests.
- [AI Code Explainer](https://www.devtools.tools/ai-code-explainer): Explain code with grounded cloud AI and source-aware validation.
- [AI Code Security Auditor](https://www.devtools.tools/ai-code-security-auditor): Audit source code for high-confidence OWASP Top 10 vulnerabilities with line-specific evidence and practical patches.
- [AI Code Translator](https://www.devtools.tools/ai-code-translator): Translate code between JavaScript, TypeScript, Python, Go, Rust, Java, and C# using target-language idioms.
- [AI Commit Message Generator](https://www.devtools.tools/ai-commit-message-generator): Generate Conventional Commits from a diff with on-device AI.
- [AI Database Schema & ER Architect](https://www.devtools.tools/ai-db-schema-architect): Generate 3NF database schemas, relationships, indexes, and Mermaid ER diagrams for PostgreSQL, MySQL, or MongoDB.
- [AI Design Pattern Refactor](https://www.devtools.tools/ai-design-pattern-refactor): Refactor legacy code into cohesive files using Strategy, Facade, Observer, Adapter, Repository, or SOLID design principles.
- [AI Documentation Generator](https://www.devtools.tools/ai-documentation-generator): Generate JSDoc/TSDoc with cloud AI and source-aware parameter validation.
- [AI E2E Test Builder](https://www.devtools.tools/ai-e2e-test-builder): Generate production-ready Playwright or Cypress end-to-end tests from a user journey.
- [AI JSON Type Inferencer](https://www.devtools.tools/ai-type-inferencer): Generate TypeScript interfaces and Zod validation schemas from JSON with nested types and enum inference.
- [AI Mermaid Diagram Generator](https://www.devtools.tools/ai-mermaid-diagram-generator): Generate valid Mermaid.js flowcharts, sequence, class, state, and ER diagrams from natural-language architecture descriptions.
- [AI Regex Generator](https://www.devtools.tools/ai-regex-generator): Generate JavaScript regex from plain English with cloud AI, examples, and a direct link to Regex Tester.
- [AI Shell Command Builder](https://www.devtools.tools/ai-shell-command-builder): Generate safe, explained Bash, Zsh, Fish, and PowerShell commands.
- [AI SQL Query Generator](https://www.devtools.tools/ai-sql-query-generator): Generate and format SQL from plain English with cloud AI, dialect selection, and optional table schemas.
- [AI Token Boundary Colorizer](https://www.devtools.tools/ai-token-boundary-colorizer): See exactly how o200k_base and cl100k_base tokenizers split your text, with per-token colors, token IDs, and character-to-token statistics.
- [AI Unit Test & Mock Generator](https://www.devtools.tools/ai-unit-test-generator): Generate executable unit tests with framework-specific mocks and dependency injection.
- [AI Vision UI to Code](https://www.devtools.tools/ai-vision-ui-to-code): Convert UI screenshots into faithful React, Vue, or HTML/CSS components with responsive cloud vision AI.
- [Context Assembler](https://www.devtools.tools/context-assembler): Merge files and folders into one LLM context block with XML tags, a project tree and a token estimate.
- [Fine-tune JSONL Validator](https://www.devtools.tools/finetune-jsonl-validator): Validate chat JSONL schema, report line-level errors, and estimate token distribution locally in your browser.
- [LLM Benchmarks](https://www.devtools.tools/llm-benchmarks): Compare 31 LLMs across coding, reasoning, speed and cost benchmarks.
- [LLM Guardrails & PII Redactor](https://www.devtools.tools/llm-guardrails-builder): Detect PII with validated local rules, redact test text, and import or export guardrail rule sets in your browser.
- [LLM Maliyet ve Bütçe Tahminleyici](https://www.devtools.tools/llm-cost-budget-forecaster): Compare deterministic LLM token costs across models with cache discounts, monthly budgets, and CSV export.
- [LLM Token Counter](https://www.devtools.tools/llm-token-counter): Count and visualize LLM tokens with model-aware BPE.
- [Needle-in-a-Haystack Generator](https://www.devtools.tools/needle-in-haystack-generator): Create a deterministic long-context prompt with a hidden needle at any depth and verify the expected answer locally.
- [Prompt Diff Comparator](https://www.devtools.tools/prompt-diff-comparator): Compare LLM prompt versions, placeholders, metrics, and expected A/B outputs locally.
- [Prompt Template Builder](https://www.devtools.tools/prompt-template-builder): Build reusable prompt templates with {{variables}}, auto-fill values and copy the compiled prompt.
- [RAG Chunking & Overlap Visualizer](https://www.devtools.tools/rag-chunking-visualizer): Compare fixed, sliding, sentence-aware, and paragraph chunking with exact offsets in your browser.
- [RAG Text Chunker](https://www.devtools.tools/text-chunker): Chunk Markdown or text by headings, words or characters with overlap and metadata for RAG.
- [SSML Markup Builder](https://www.devtools.tools/ssml-markup-builder): Create deterministic SSML with prosody, breaks, emphasis, say-as, and substitutions, then validate it locally.
- [System Prompt Compressor](https://www.devtools.tools/system-prompt-compressor): Compress system prompts with conservative, deterministic rules in your browser.
- [Token Cost Calculator](https://www.devtools.tools/token-cost-calculator): Estimate and compare LLM API costs across models with prompt caching, batch, traffic simulation and a real tokenizer.