HEIC to WebP Converter

This tool turns a HEIC file into a WebP file. Drop an image onto the upload zone or click it to browse your device, and a preview appears once the file has been decoded. Alongside the convert button you'll find a quality slider to balance file size against visual fidelity. Nothing leaves your device: the file is read locally, converted locally, and the download link points at data held only in this browser tab.

Under the hood, the file is handed to that WebAssembly library, which decompresses it into raw pixels; a self-hosted WebAssembly build of libheif decodes the file, so this works the same way in Chrome, Firefox, Edge, and Safari. The library is loaded once from this site's own assets, not a third-party CDN. Those pixels then land on an HTML canvas, from which they are re-encoded as WebP. The canvas API writes this out directly as a WebP blob at the quality you set, when the browser supports it.

As with any browser-based converter there are limits worth knowing. On the input side, the first HEIC file on a page load has to wait for a ~1.4 MB decoder library to download once (it's then cached by the browser for the rest of the session), and a small number of unusual HEIC variants — multi-image bursts, depth maps, or exotic chroma formats — may not decode correctly through this library. On the output side, Not every browser build supports WebP encoding through the canvas API; if yours does not, the tool tells you instead of producing a broken file.