The main constraint I set: nothing leaves the browser. No file uploads, no server, no account. PDF merge, image processing, OCR, video-to-GIF — all done via WebAssembly or native browser APIs client-side.
Tech behind some of the tools:
* PDF operations → pdf-lib + custom worker
* Image/video processing → Canvas API + ffmpeg.wasm
* OCR → Tesseract.js
* QR generation → client-side JS library
* Remove background → runs locally in-browser
* etc
