About i4u
tools-i4u.jp is a collection of free online tools for everyone.
tools-i4u.jp is a web service that provides free online tools including image processing, text conversion, and utilities for daily work. No registration required - all features are available directly in your browser.
Completely Free
All tools are available for free. No account registration or payment required.
Privacy Protection
Data is processed within your browser and not uploaded to servers. Use with confidence.
Rich Collection
Over 60 diverse tools from image processing to document conversion.
Simple Operation
Intuitive interface that anyone can use easily.
Image Processing
Background removal, format conversion, resizing, filter effects, etc.
Text Processing
Translation, encryption, diff comparison, encoding conversion, etc.
Utilities
QR code generation, password generation, calculator, unit conversion, etc.
We utilize the latest web technologies to provide fast and secure tools. Client-side processing using WebAssembly (WASM) ensures privacy protection while delivering high-performance functionality.
Technology Stack
- Next.js 14 (React Framework)
- TypeScript
- Tailwind CSS
- shadcn/ui
- WASM (WebAssembly)