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Developer Tools

Everyday developer utilities. Pretty-print JSON, decode JWTs, encode/decode Base64 and URLs, convert timestamps, and pick colors - fast and private.

6 tools available

JSON Formatter

Format, validate, and minify JSON. Catches syntax errors with line numbers. 100% browser-based.

Base64 Encoder/Decoder

Encode and decode Base64 strings in your browser. Supports UTF-8 and binary. No upload.

JWT Decoder

Decode JSON Web Tokens to view header, payload, and signature. Free, browser-based, doesn't verify.

Timestamp Converter

Convert Unix timestamps (seconds or milliseconds) to human-readable dates and back. Multiple timezones.

URL Encoder/Decoder

Encode or decode URL strings. Handles full URLs and query parameter values. 100% browser-based.

Color Picker & Converter

Pick a color visually and get its HEX, RGB, HSL, and CSS values. Free, browser-based.

ATLX Tools

Free, browser-based online tools. Everything runs locally on your device - your files never leave your computer.

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All tools run in your browser. We don’t store your files.