# DevTools.tools

> Free, privacy-focused developer utilities. Tool input stays in the browser unless a tool explicitly needs a network request. No signup, no advertising. English-only.

Canonical site: https://www.devtools.tools
Full catalog: https://www.devtools.tools/llms-full.txt
Sitemap: https://www.devtools.tools/sitemap.xml

## Core tools

- [JSON Formatter](https://www.devtools.tools/json-formatter): Format, validate and beautify JSON instantly in your browser.
- [JWT Token Decoder](https://www.devtools.tools/jwt-decoder): Decode and inspect JSON Web Tokens (JWT) online.
- [Base64 Toolbox](https://www.devtools.tools/base64): Encode and decode Base64 text, files and images online.
- [Regex Tester](https://www.devtools.tools/regexp-tester): Test JavaScript regular expressions with live matches, capture groups, flags, and replace previews.
- [JSON to TypeScript](https://www.devtools.tools/json-to-typescript): Convert JSON into TypeScript interfaces instantly.
- [JSON ⇄ YAML Converter](https://www.devtools.tools/json-to-yaml): Convert JSON to YAML and YAML to JSON online.
- [Cron Expression Builder](https://www.devtools.tools/cron-builder): Build and validate cron expressions with a visual editor and ready-made presets.
- [UUID Generator](https://www.devtools.tools/uuid-generator): Generate v1 and v4 UUIDs online for free.
- [Hash Generator](https://www.devtools.tools/hash-generator): Generate MD5, SHA-1, SHA-256 and SHA-512 hashes online.
- [Color Contrast Checker](https://www.devtools.tools/color-contrast-checker): Check color contrast ratios for WCAG AA/AAA compliance online.
- [XML Formatter & Validator](https://www.devtools.tools/xml-formatter): Format, beautify and validate XML documents online.
- [SSL/TLS Deep Inspector](https://www.devtools.tools/ssl-inspector): Inspect TLS handshakes for any hostname.
- [Security Headers Checker](https://www.devtools.tools/security-headers-checker): Live GET request grades HSTS, CSP, X-Frame-Options and more.
- [DNS Lookup Tool](https://www.devtools.tools/dns-lookup): Query DNS records and resolve domain names to IP addresses

## Categories

- [Color Tools](https://www.devtools.tools/category/color-tools)
- [Design Tools](https://www.devtools.tools/category/design-tools)
- [Data Processing](https://www.devtools.tools/category/data-processing)
- [Text & Analysis](https://www.devtools.tools/category/text-analysis)
- [Generators](https://www.devtools.tools/category/generators)
- [Security Tools](https://www.devtools.tools/category/security-tools)
- [Network & API Tools](https://www.devtools.tools/category/network-api-tools)
- [Development Utilities](https://www.devtools.tools/category/development-utilities)
- [Visual Tools](https://www.devtools.tools/category/visual-tools)
- [Creator & Business Tools](https://www.devtools.tools/category/creator-business-tools)
- [Media & Audio](https://www.devtools.tools/category/media-audio)
- [Sound Tools](https://www.devtools.tools/category/sound-tools)
- [Financial Tools](https://www.devtools.tools/category/financial-tools)
- [Productivity Tools](https://www.devtools.tools/category/productivity-tools)
- [Device & Sensors](https://www.devtools.tools/category/device-sensors)
- [Education & Science](https://www.devtools.tools/category/education-science)
- [Daily & Lifestyle](https://www.devtools.tools/category/daily-lifestyle)
- [Health & Lifestyle](https://www.devtools.tools/category/health-lifestyle)
- [Randomness & Games](https://www.devtools.tools/category/randomness-games)
- [Games](https://www.devtools.tools/category/games)
- [Time & Productivity](https://www.devtools.tools/category/time-productivity)
- [AI Tools](https://www.devtools.tools/category/ai-tools)

## Guides and reference

- [Developer guides](https://www.devtools.tools/blog)
- [Cheat sheets](https://www.devtools.tools/cheatsheets)
- [HTTP status codes](https://www.devtools.tools/http-status)
- [Cron examples](https://www.devtools.tools/cron)
- [AI Community Hub](https://www.devtools.tools/ai)

## Site information

- [Home](https://www.devtools.tools/)
- [Privacy](https://www.devtools.tools/privacy)
- [Terms](https://www.devtools.tools/terms)
- [Contact](https://www.devtools.tools/contact)
- [llms-full.txt](https://www.devtools.tools/llms-full.txt)