Runs locally · Zero uploads

Image Converter

HEIC, JPG, PNG, WebP, AVIF — convert between any of them, locally.

How it works

Convert HEIC photos from your iPhone to JPG without uploading them anywhere. Convert PNGs to WebP for faster web pages. Convert AVIF to JPG for compatibility with older tools. The conversion happens entirely in your browser using WebAssembly — your image never touches a server.

Verify it yourself. Open DevTools → Network → run a conversion. The only requests you'll see are the page assets — your file never leaves this tab.

FAQ

Does this work for HEIC photos from my iPhone?

Yes — HEIC and HEIF files from any iPhone or iPad work. Decoding runs via libheif compiled to WebAssembly, so the file stays on your device.

What is the difference between AVIF, WebP, and JPG?

JPG is the universal compatibility format. WebP gives ~25–35% smaller files with the same visual quality. AVIF is even smaller (~50% smaller than JPG) but support is newer. Pick AVIF or WebP for the web, JPG for sending to people.

Is there a file size limit?

Practical limit is around 100 MB — beyond that the in-browser WebAssembly can run out of memory. The paid API at api.bytario.com handles larger files server-side without that ceiling.