devtools.tools valid

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.

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For agents: Free privacy-focused developer utilities in the browser: JSON formatter, JWT decoder, Base64, regex tester, JSON-to-TypeScript and cron builder.

json formatter jwt decoder regex tester base64 cron builder

Authority: 50 reach 0 · trust 10 · quality 25 · freshness 15
Tier: listed
llms.txt: https://www.devtools.tools/llms.txt
llms-full.txt: https://www.devtools.tools/llms-full.txt
Sections: 4
Links: 47
Size: 4369 bytes
Registered: 2024-03-03
Country: United States Hosting inference
Hosting country: United States Hosting inference
Country evidence: No published address evidence collected yet
Categories: Developer tools
For agents: Documentation: developer or product docs worth reading, nothing to call
Inferred actions: Read documentation About these labels
Audience: developers · agents can: read docs · en
First seen: 2026-10-25T14:58:41.379Z
Last checked: 2026-10-25T14:58:45.483Z
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Their llms.txt

The beginning of the file, from our validated copy saved 2026-10-25T14:58:41.392Z. Cached copy · Source on devtools.tools

# 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): Paste a JWT to see its header, payload and exp/iat times instantly.
- [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-t
…

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Machine-readable: GET /v1/resolve?q=devtools.tools · GET /v1/domain/devtools.tools · this page as Accept: application/json or text/markdown · MCP lookup_domain

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