About DevTools.fyi

DevTools.fyi is a collection of free online tools built for developers, designers, and content creators. Our mission is simple: provide fast, reliable utilities that work instantly without requiring sign-ups, subscriptions, or data uploads.

Every tool on this site runs entirely in your browser using JavaScript. When you paste JSON, text, or any other data, it never leaves your device. We do not collect, store, or transmit any user input. This makes DevTools.fyi safe to use with sensitive code, credentials, and proprietary data.

Our Tools

We cover the most common developer needs: JSON formatting and validation, Base64 and URL encoding/decoding, text utilities (word counting, case conversion, diff checking), cryptographic hash generators (MD5, SHA-256), time utilities (Unix timestamp, cron parsing), color conversion (HEX/RGB/HSL), and more.

Built for Speed

DevTools.fyi is built with Next.js and deployed on Cloudflare's global CDN, ensuring sub-100ms load times worldwide. All pages are statically generated, which means instant delivery without server-side processing delays.

Always Free

All tools are and will always be completely free. There are no premium tiers, no rate limits, and no feature gates. We believe essential developer utilities should be accessible to everyone.