AVIF to JPG

Because the decoder is your browser, and that browser is too old for AVIF. Chrome and Edge read it from version 85, Firefox from 93, Safari from 16.4 (macOS Ventura, iOS 16.4). No page that runs inside a browser can work around a missing decoder; the alternative is a server-side converter, which means uploading your photo to someone else.

Smaller, at the same picture — often half the bytes, which is why sites serve it. Compatibility is the other half of the story: JPG is read by everything ever made, AVIF by software from the last few years. Convert when you need the file to open somewhere old; keep the AVIF for anything going on a web page.

Slightly, as any lossy-to-lossy conversion does. Quality 85 in the export dialog puts the second pass well below what is visible; the size figure next to the slider shows what you are paying for it.

Yes. JPG and JPEG are one format with two spellings, left over from the days when file extensions were three letters. Anything that opens a .jpg opens a .jpeg; if a strict upload form insists on the shorter one, rename the file and it will be accepted.

No. PIXLFLW runs entirely in your browser: images are opened, edited and exported locally on your device and are never uploaded, stored or seen by anyone.

Yes, completely free — no sign-up, no watermarks and no daily limits. The only practical limit is your browser memory for very large files (up to 20 MB per image).