Transparency becomes a solid colour
AVIF can store transparent areas and JPG cannot, so anything see-through is filled with the background colour you choose before exporting.
AVIF is what Chrome and Android increasingly save, and what a lot of older software still refuses to open. Turn one into an ordinary JPG on your own device.
Choose the right format
JPG opens in practically everything, and that compatibility costs you a few of the things AVIF was designed to keep.
AVIF can store transparent areas and JPG cannot, so anything see-through is filled with the background colour you choose before exporting.
AVIF compresses far harder than JPG. The same picture often lands several times bigger, even at a high quality setting.
The new file is written from the decoded pixels, so EXIF, XMP, and any location data stored in the AVIF are not carried across.
Conversion questions
AVIF is recent. Browsers handle it well, but many desktop editors, older phones, print services, and upload forms still reject it. Converting to JPG sidesteps that entirely.
A little. JPG is lossy, so re-encoding costs some detail. At a quality setting of 90 or above the difference is hard to see on a photograph.
It is mapped down to ordinary 8-bit colour, because JPG cannot store high dynamic range. Very bright highlights may shift slightly.
No. The file is decoded, converted, previewed, and downloaded entirely inside your browser.