# 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.

Canonical site: https://www.devtools.tools
Full catalog: https://www.devtools.tools/sitemap.xml

## Core tools

- [JSON Formatter](https://www.devtools.tools/json-formatter): Format, validate, search, and inspect JSON.
- [JWT Decoder](https://www.devtools.tools/jwt-decoder): Inspect JWT headers and payloads in the browser.
- [Base64 Encoder/Decoder](https://www.devtools.tools/base64): Encode and decode Base64 text.
- [Regular Expression Tester](https://www.devtools.tools/regexp-tester): Test regular expressions against sample text.
- [JSON to TypeScript](https://www.devtools.tools/json-to-typescript): Generate TypeScript interfaces from JSON samples.
- [JSON to YAML](https://www.devtools.tools/json-to-yaml): Convert JSON and YAML in either direction.
- [Cron Expression Builder](https://www.devtools.tools/cron-builder): Build and explain cron expressions.
- [HTTP Status Code Reference](https://www.devtools.tools/http-status): Browse HTTP status codes, examples, and fixes.
- [UUID Generator](https://www.devtools.tools/uuid-generator): Generate UUID, ULID, and NanoID values.
- [Hash Generator](https://www.devtools.tools/hash-generator): SHA and other hashes in the browser.
- [Color Contrast Checker](https://www.devtools.tools/color-contrast-checker): Check WCAG contrast ratios.
- [XML Formatter](https://www.devtools.tools/xml-formatter): Format and validate XML.
- [SSL Inspector](https://www.devtools.tools/ssl-inspector): Inspect TLS certificates and handshake details.
- [Security Headers Checker](https://www.devtools.tools/security-headers-checker): Grade HTTP security headers.
- [DNS Lookup](https://www.devtools.tools/dns-lookup): Query DNS records over HTTPS.

## 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)
- [Financial Tools](https://www.devtools.tools/category/financial-tools)
- [Productivity Tools](https://www.devtools.tools/category/productivity-tools)
- [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)
- [Abuse](https://www.devtools.tools/legal/abuse)
- [Sitemap](https://www.devtools.tools/sitemap.xml)
- [Blog RSS](https://www.devtools.tools/blog/rss.xml)
- [AI RSS](https://www.devtools.tools/ai/rss.xml)