About DevToolBox

DevToolBox is a collection of free, fast, and privacy-focused developer utilities. Every tool runs entirely in your browser — no data is ever uploaded to any server.

Whether you need to quickly format JSON, convert a timestamp, test a regex, or encode a URL, DevToolBox has you covered with a clean, distraction-free interface.

Our Tools

{} JSON Formatter

Format, validate, and minify JSON data with instant feedback and character count tracking.

B64 Base64 Encoder / Decoder

Encode and decode Base64 strings with full Unicode and CJK character support.

🕓 Timestamp Converter

Convert between Unix timestamps (seconds/milliseconds) and human-readable ISO dates with relative time display.

🎨 Color Converter

Instantly convert colors between HEX, RGB, and HSL formats with a live color preview.

.* Regex Tester

Test regular expressions in real time with pattern validation, custom flags, and match counting.

%20 URL Encoder / Decoder

Encode and decode URLs using standard encodeURIComponent for safe URL transmission.

Privacy First

All tools run 100% client-side in your browser. Your data never leaves your machine. There are no server-side processing, no uploads, and no data storage. We believe developer tools should be fast, free, and private.

Contact

Have feedback, suggestions, or found a bug? Reach out to us at contact@yourdomain.com.