I built a toolbox where your files never leave the browser
Every time I needed to convert a HEIC photo, compress a PDF, or format some JSON, I'd land on a site that made me upload my file to their server. For a screenshot, fine. For a contract or an ID scan? No thanks. So I bui
Every time I needed to convert a HEIC photo, compress a PDF, or format some JSON, I'd land on a site that made me upload my file to their server. For a screenshot, fine. For a contract or an ID scan? No thanks.
So I built Yunknow Toolbox β free online tools where everything runs in your browser. Files are never uploaded. No account, no install.
How it works (all client-side):
- Image convert & compress (PNG/JPG/WebP/AVIFβ¦) β Canvas API
- HEIC / TIFF decode β libheif / UTIF compiled to WebAssembly
- PDF merge / split / rotate / compress, image β PDF β pdf-lib & pdf.js
- JSON / Base64 / JWT / regex / QR / password / UUID β plain JS, no network
Because nothing leaves your device, it's fast and private by design, and it works offline as a PWA. Built with Astro, multilingual (EN / δΈζ / ζ₯ζ¬θͺ / Deutsch), on Cloudflare Pages.
If you've ever hesitated to paste sensitive data into an online tool, this is for you β https://yunknow.cc/
What tool should I add next?
Originally published by Dev.to WebDev. Aggregated on AIWithGhost for educational purposes β full credit and traffic to the original publisher.