Convert modern AVIF images to widely supported JPG
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AVIF is one of the newest image formats on the web, and it has a real strength: squeezing pictures into remarkably small files. The catch shows up the moment you save one and try to use it somewhere ordinary. An older photo viewer shrugs, a word processor refuses to place it, a print shop's uploader does not list it, and a colleague on a dated phone just sees a broken thumbnail. Converting the AVIF to JPG sidesteps all of that, because JPG is the one raster format that essentially everything made in the last thirty years can read.
The converter decodes each AVIF and re-encodes it as a standard JPEG at the quality you pick. The default of 90 keeps the result visually faithful to the original while producing a file that drops straight into documents, email and any upload box. You will usually trade away AVIF's superb compression, so the JPG tends to be larger, but in return it simply works everywhere, on whatever device someone opens it with.
Most people meet AVIF by accident rather than by choosing it. You right-click and save an image from a site that has switched to modern formats, and the file lands as a .avif you cannot then open in your usual editor. A teammate sends one exported from a newer tool, or a stock library hands you AVIF to keep its bandwidth down. The image itself is perfectly good; it is only the wrapper that is ahead of the software you are trying to use it with. Turning it into a JPG is the quickest way to stop fighting compatibility and get on with the actual task.
AVIF can carry a transparent background, and JPG cannot, so any see-through areas are filled with white as the JPG is written. If keeping that transparency matters, convert to PNG instead with AVIF to PNG, which preserves the alpha channel. To go back the other way and shrink files again once compatibility is no longer a concern, JPG to AVIF handles the return trip.
If your originals are WebP rather than AVIF, WebP to JPG does the equivalent job for that format, and AVIF to PNG is there for the times you need transparency kept rather than flattened to white.
Add the AVIFs you can't open, either one image or a group of them in one go.
Ninety works well for most pictures. Lower it for a smaller file, raise it for anything print-bound.
A single image comes straight back; a group is zipped with the original filenames.
AVIF is recent enough that plenty of software has not caught up. Current browsers handle it, but many desktop viewers, office suites, older phones and print services do not, which is exactly the gap converting to JPG closes.
Usually, yes. AVIF is one of the most efficient formats around, so a JPG of the same picture at high quality often takes more space. You are trading that efficiency for a file that opens reliably on any device.
JPG has no transparency, so see-through areas become solid white. When that background needs to stay clear, use AVIF to PNG instead, which keeps the alpha channel intact.
Yes. The quality slider defaults to 90, which keeps the JPG close to the original. Lower it if you want a smaller file and can accept a little softening, or keep it high for anything going to print.
Almost always from the modern web. Many sites now serve AVIF to save bandwidth, so an image you save from a page can land as one, and some newer editors and stock libraries export it too. The picture is fine; it is just stored in a wrapper your other software has not learned to read yet.