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1## Background
As a developer, I found myself constantly searching for simple utilities like JSON formatters, UUID generators, and color pickers. Most existing options were cluttered with ads, required sign-ups, or sent data to servers. I wanted clean, fast tools that respected privacy.
So I built UFreeTools as a modern SPA using Vue 3 and Vite with:
- 100% client-side processing for all tools - Progressive loading with dynamic imports (only load what you use) - Dark/light theme support - Offline capability for most tools - Responsive design that works well on mobile
## Technical Details
Some of the more technically interesting implementations:
- *JWT Debugger*: Uses WebCrypto API for verification of all common algorithms - *Symmetric Encryption*: Implements AES-GCM/CBC/CTR with PBKDF2 key derivation - *Image Processing*: Uses Web Workers for non-blocking operations on large images
## Lessons Learned
The biggest challenges were:
1. *Performance optimization*: Some tools (like image processors) needed careful optimization to handle large files without freezing the UI 2. *Browser API limitations*: Working around browser restrictions for certain crypto operations 3. *Bundle size management*: Keeping the initial load small while supporting 60+ tools
## Future Plans
I'm planning to add: - Tool configurations sync via local storage - More specialized tools for developers based on feedback
I built it because I needed these tools myself, and I hope others find it useful.
I'd love your feedback, especially on UX, tool suggestions, or if you find any bugs!
[Try UFreeTools](https://www.ufreetools.com/)