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Both formats are modern and both are efficient, so a WebP to AVIF conversion is not the usual rescue mission from an old format to a new one. It is a fine tuning exercise, and whether it is worth doing depends entirely on what your pictures look like.
Photographs, especially detailed ones. AVIF holds fine texture together at low file sizes better than WebP manages, and on a busy image the gap is real. On flat illustrations, logos and simple graphics the two land close enough that the switch is barely worth the trouble.
An alpha channel comes through intact, so cutouts and soft shadows are safe. Animation is the catch. An animated WebP does not arrive as an animated AVIF here, you get a single frame, so check what your file actually contains before you convert a folder of them.
AVIF is slower to encode and read by slightly less software than WebP is. You are buying smaller files with a little more compatibility risk and a slower conversion. On a busy site that is usually a good deal. On a handful of images it may not be worth the afternoon.
The honest way to decide is to run a single representative image and compare the two numbers on the row. If the saving is a few percent, leave the WebP files alone.
Better on photographs
Detailed images hold together at smaller sizes than WebP manages.
Alpha channel preserved
Transparent and partly transparent areas survive the conversion unchanged.
Sizes side by side
Each row shows both weights so you can judge whether the switch earned anything.
Free to test
Running one file to check the saving costs nothing, so there is no reason not to.
GIF to JPEG Converter
Turn a GIF into a still JPEG image, keeping the first frame and filling transparency with white.
GIF to JFIF Converter
Write GIF images out as .jfif files for record systems and older applications.
GIF to AVIF Converter
Rewrite a GIF as a modern AVIF image, keeping the picture and dropping the 256 colour ceiling.
AVIF to JPEG Converter
Turn AVIF images into ordinary JPEG photos that every viewer, editor and upload form accepts.
On photograph heavy pages, usually yes. On a site of flat graphics and icons the saving is often too small to justify the work.
WebP, comfortably, once you leave the browser. Inside a current browser both are handled without any fallback needed.
AVIF encoding does far more work per image than WebP does. A large batch takes real time rather than seconds.
Keeping them is sensible if any of your audience uses older software, since it gives you something to fall back on.