How this converter works
Every current browser can decode AVIF; almost nothing else can. This tool uses that asymmetry: it reads each AVIF with the browser's own decoder, redraws it on a canvas, and exports a JPG at the quality you choose. Nothing is uploaded, so a batch of files converts in seconds and works even offline once the page has loaded.
What an AVIF file is, and why you have one
AVIF is the image format derived from the AV1 video codec: even smaller than WebP at the same quality, which is why CDNs and image-heavy sites started serving it. Save an image from one of those sites and you get an .avif that your photo editor, upload form or office suite has never heard of. The format is excellent on the wire and unsupported at the desk, and converting a copy is the practical fix.
JPG or PNG as the target?
JPG for photos and anywhere compatibility is the point; it is the smallest and the most universally accepted. But JPG has no transparency: transparent regions come out white. If your AVIF has an alpha channel you care about, use our AVIF to PNG converter, which preserves it exactly. For the WebP flavor of the same problem, there is a WebP to JPG converter too.