JPG to AVIF Converter

Encodes a JPG image as AVIF, a next-generation format based on the AV1 video codec, using a WebAssembly build of the libavif encoder that runs entirely inside your browser.

Drop or select one JPG file. The image is drawn to a canvas and its pixels are handed to the WebAssembly AVIF encoder; a ready-to-download AVIF file appears once encoding finishes, typically within a few seconds.

Upload portrait.jpg (2.4 MB) and you get portrait.avif ready to download, usually a noticeably smaller file at a similar visual quality, encoded at the tool's default quality setting of 75.

AVIF generally produces much smaller files than JPG at comparable visual quality, which helps when file size matters — faster page loads, less storage, smaller uploads — as long as wherever you use the file supports AVIF.

Encoding runs a full WebAssembly build of the AV1 image encoder in your browser, which is more computationally demanding than a simple format conversion — large photos can take several seconds instead of appearing instantly. The output uses lossy compression at quality 75 by default, so it is not a pixel-exact copy of the source JPG.

Only one file can be converted at a time — there's no batch mode or quality slider yet. Some older devices, email clients and desktop software still don't display AVIF, so keep a JPG copy if you're unsure the recipient supports it.

Encoding uses a WebAssembly build of the open-source libavif library (the reference AVIF codec). The whole process runs locally in your browser; your image is never uploaded to a server.