Every time I needed to convert a HEIC photo, compress a PDF, or format some JSON, I'd land on a site...
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 — 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/AVIF…) — Canvas API
HEIC / TIFF decode — libheif / UTIF compiled to WebAssembly
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