The Offline Image Converter allows you to convert between image formats directly in your browser without uploading them anywhere.
It uses the Rust crate image, compiled to WebAssembly.

Try it here: https://imageconvert.mhh.dev/

1. Build the WebAssembly files:

   wasm-pack build --target web

2. Serve the files with any HTTP server, for example:

   python3 -m http.server