Why convert AVIF to JPG
AVIF compresses better than both JPEG and WebP, which is why it is spreading across the web, and it is newer than either, which is why the software on your computer probably cannot open it. As with WebP, this conversion is about compatibility: you saved an image from a site and now need it in something that has never heard of the format.
What this conversion costs you
- Wider colour and HDR are flattened. AVIF can store a wider range of colour and brightness than JPEG. Converting maps everything into standard sRGB, which can slightly dull very saturated or very bright areas on a display capable of showing them.
- Transparency is flattened. AVIF supports an alpha channel and JPEG does not, so transparent areas become white. Convert to PNG or WebP instead if that matters.
- A second round of lossy compression. Both formats are lossy, so a little further detail is discarded.
When not to do this
Do not convert if your software actually supports AVIF — you would be giving up its efficiency for nothing. And avoid JPG specifically if the image has transparency.
Common questions
What is an AVIF file?
A modern image format based on the AV1 video codec. It compresses better than JPEG and WebP and supports transparency and high dynamic range, which is why websites have begun adopting it.
Why won't my computer open an AVIF?
Browser support arrived well before desktop support. Many operating systems and image editors still cannot decode AVIF, even though the browser that downloaded it displays it fine.
Will the JPG be larger?
Yes, usually significantly, because AVIF is the more efficient format. Compatibility is what you gain in exchange.