What AVIF is and why you have one
AVIF comes from the AV1 video codec and compresses harder than anything before it — often half the size of a JPG at the same visible quality, with transparency and proper handling of bright highlights thrown in. Sites that care about page weight have been serving it since about 2021.
Which is why you have one: you saved an image from a page. Browser support is broad, but desktop applications, older phones and upload forms lag well behind.
What conversion costs
The JPG will be substantially larger — often twice the size — because JPG is a much older codec. There is also one round of re-encoding, so the picture passes through a second lossy format. At normal viewing sizes neither is noticeable; on a large flat gradient you may see slight banding that was not there before.
Choose PNG instead if the image is transparent or if it is a diagram rather than a photograph.
If nothing decodes here
Conversion uses the decoder built into your own browser. A very old browser will not have one, and the file will fail to open rather than convert incorrectly. Current Chrome, Edge, Firefox and Safari all read AVIF.
Frequently asked questions
Why can my photo editor not open AVIF?
Most desktop software adopted it late or not at all. Browsers moved first because the saving in page weight was worth it to them. Converting to JPG or PNG gives you something every editor reads.
Will I lose quality?
A little, once, converting to JPG — two lossy formats in a row. Converting to PNG loses nothing but produces a much larger file. Neither can recover detail AVIF had already discarded.
Does it keep transparency?
Only if you convert to PNG. JPG has no alpha channel, so transparent areas become solid.
Is the file uploaded anywhere?
No — your browser decodes the AVIF itself and the result is written straight to your downloads folder.
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