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Free Developer Tools

15 tools

Format JSON, decode tokens, test regular expressions, generate UUIDs, and work with colours - free developer utilities that run in your browser.

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GitHub Profile Look up any GitHub user profile - view their repositories, stars, followers, and contribution activity in a clean summary. JWT Decoder Decode and inspect JSON Web Tokens (JWT) instantly. View header, payload, and signature - no libraries or backend needed. Stopwatch / Pomodoro Use the online stopwatch or Pomodoro timer to boost productivity. Set focus sessions and short breaks to work smarter. Text Tools All-in-one developer text toolkit - format JSON, encode/decode Base64, generate MD5/SHA hashes, and convert letter case. Color Tools Pick colors, convert between HEX, RGB, and HSL, build palettes, and generate CSS gradients. An essential toolkit for designers. IP Lookup Find the location, ISP, timezone, and organization behind any IP address. Also shows your own public IP automatically. YouTube Thumbnail Download the thumbnail of any YouTube video in HD, SD, or full resolution. Paste the video URL and save the image instantly. JSON Formatter Beautify, indent, and validate JSON instantly. Spot syntax errors and format messy API responses into readable code. JSON Minifier Compress JSON by removing whitespace to reduce payload size for APIs and config files, with byte savings shown. Base64 Encoder Encode text to Base64 or decode it back, with full Unicode support. Ideal for data URIs, tokens, and email payloads. URL Encoder Percent-encode text for safe use in URLs and query strings, or decode an encoded URL back to readable text. UUID Generator Generate cryptographically random version-4 UUIDs (GUIDs) in bulk for databases, keys, and APIs. Copy with one click. HTML Formatter Format, beautify, and indent messy HTML code. Also supports minification for production-ready output. Regex Tester Test regular expressions against sample text in real-time. Shows matches, groups, and supports replacement. Cron Expression Generator Generate cron expressions with visual fields and common presets. Perfect for Linux scheduling and automation.

About Developer Tools

These are the small utilities developers reach for every day. Beautify and validate messy API responses with the JSON Formatter, inspect a token with the JWT Decoder, build a pattern in the Regex Tester, or grab a UUID. Encoding tools for Base64 and URLs round out the kit.

Because everything runs client-side, code snippets and tokens you paste stay on your device - useful when you are working with anything sensitive.

Frequently Asked Questions

Do these tools send my code to a server?

No. They run entirely in your browser, so snippets, tokens, and data you paste are not uploaded.

Is it safe to decode a JWT here?

Yes - decoding happens locally and reads only the token's claims. As always, only inspect tokens you are authorised to handle.

Are the tools free with no limits?

Yes. Every developer tool is free to use with no sign-up or usage caps.