Features

100% Client-Side Processing

Every tool on DevToolKit runs entirely in your browser using JavaScript. Your data is never sent to a server, never stored in a database, and never shared with anyone. Whether you're formatting JSON, decoding JWTs, or generating UUIDs — everything happens locally on your device.

This means DevToolKit is faster than server-based alternatives (no network round-trips), more private (your data stays on your machine), and works even when you're offline.

Works Offline

DevToolKit is a Progressive Web App (PWA) with full offline support. Click the Offline button in the navbar to cache all tools at once. After that, every tool works without an internet connection.

• Cache on demand — nothing is cached automatically. You control when and what gets cached by clicking the Offline button.
• Clear anytime — hover the green Offline button and click "Clear cache" to free up storage. The cached data is typically under 5 MB.
• Always up to date — when we add new tools, the Offline button automatically includes them. If your cache is outdated, the button resets so you can re-cache the latest version.

Install as an App

You can install DevToolKit as a standalone app on your desktop or phone. In Chrome, look for the install icon in the address bar. On mobile, tap "Add to Home Screen" from the browser menu. The app opens in its own window without the browser toolbar — it looks and feels like a native application.

Installing doesn't download anything extra. The app still loads from our website (or from cache when offline). It's simply a shortcut with a cleaner interface.

No Signup, No Tracking

There are no user accounts, no login forms, and no personal data collection. DevToolKit uses minimal local storage only to remember your theme preference (dark or light mode). No analytics track your behavior, and no cookies profile you across the web.

Free, No Limits

All tools are completely free with no usage limits, no paywalls, and no feature gates. Format as much JSON as you want, generate as many UUIDs as you need, hash as many strings as you like. There are no daily quotas or premium tiers.

Fast & Lightweight

DevToolKit is built with Next.js and optimized for performance. Pages load instantly with static generation, fonts are self-hosted to avoid third-party requests, and tools process data in real-time as you type — no "Submit" buttons or loading spinners.