JPG has been the standard photo format for decades. AVIF is a newer format that compresses photographs more efficiently, so the same picture can take noticeably less space at similar visual quality. Converting JPG to AVIF is a way to speed up image-heavy pages or free up storage.
Remember that a JPG is already lossy. Converting it to another lossy format adds a second round of compression, so work from the best-quality JPG you have and avoid converting the same image back and forth. A JPG that is already heavily compressed will shrink less. AVIF is also newer: current versions of Chrome, Firefox, Safari and Edge open it, but older browsers and some apps and upload forms do not. Encoding is slower than JPG, and it runs in your browser, so large photos take a few seconds each.
Choose High for a good balance, Max for the least visible loss, or Low when file size matters most. The pixel dimensions never change, each file keeps its name with only the extension swapped, and no metadata or watermark is added. Everything runs in your browser, so your images are never uploaded.
Tip: compare one file at High and Medium before converting a whole folder. Photographs often hold up well at Medium, and the files get smaller again.
Usually yes. AVIF is often 30 to 50 percent smaller than a JPG at similar visual quality, but results vary. A JPG that is already heavily compressed gains less.
Yes, a little. The JPG has already lost some detail, and AVIF is lossy too. At High quality the difference is hard to see, but avoid converting the same image repeatedly.
Current versions of Chrome, Firefox, Safari and Edge can. Some older browsers, email clients and desktop apps cannot, so keep the JPG for sharing when you are unsure.
JPG has no transparency, so there is nothing to keep. The AVIF is a normal opaque image.
Yes. Add them all, convert once and download a single ZIP. Only the extension changes. A file named holiday.jpg becomes holiday.avif.
No. The conversion happens in your browser and the files never leave your device.