Convert animated GIF to AVIF
Images New in 1.15Re-encodes animated GIFs as animated AVIF for browsers that accept it.
Filter
convert_to_avif_animated
· Filter docs
A mod_pagespeed 1.15 filter. ModPageSpeed 2.0 applies it as part of one always-on pipeline, not as a separate switch.
Both frames render identically — that's the goal. The win is in the bytes and requests
below, not the look. They're served live by mod_pagespeed 1.15 on
demo-httpd-1.1.modpagespeed.com; the optimized frame
applies only this filter. Right after a cache purge it may briefly match the original while
the worker rewrites it — reload to see the result.
Measured impact
Total bytes
What changed in the source
The page's HTML, before and after this filter. Red lines are removed, green lines are added.
… 2 unchanged lines …
<title>convert_to_avif_animated example</title>
</head>
<body>
- <img src="images/CradleAnimation.gif" title="An animated GIF. PageSpeed will re-encode it as an animated
+ <img src="images/xCradleAnimation.gif.pagespeed.ic.io4xRbxNA1.avif" title="An animated GIF. PageSpeed will re-encode it as an animated
AVIF for browsers that accept it, so it can be served in fewer
bytes."/><br/>
</body>
Run this on your own site
This is one of 49 filters mod_pagespeed 1.15 applies in place — self-hosted on
Apache, nginx, and IIS. Install and run it: it optimizes right away and adds an
X-PageSpeed-Warn: unlicensed header until you license it.
Production use requires a commercial license — but the software never locks you out.