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Use video formats for animated content

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The Opportunities section of your Lighthouse report lists all animated GIFs, along with estimated savings in seconds achieved by converting these GIFs to video:

A screenshot of the Lighthouse Use video formats for animated content audit

See the Lighthouse performance scoring post to learn how your page's overall performance score is calculated.

Why you should replace animated GIFs with video

Large GIFs are inefficient for delivering animated content. By converting large GIFs to videos, you can save big on users' bandwidth. Consider using MPEG4/WebM videos for animations and PNG/WebP for static images instead of GIF to save network bytes.

Create MPEG videos

There are a number of ways to convert GIFs to video. FFmpeg is the tool used in this guide. To use FFmpeg to convert the GIF, my-animation.gif to an MP4 video, run the following command in your console:

ffmpeg -i my-animation.gif my-animation.mp4

This tells FFmpeg to take my-animation.gif as the input, signified by the -i flag, and to convert it to a video called my-animation.mp4.

Create WebM videos

WebM videos are much smaller than MP4 videos, but not all browsers support WebM so it makes sense to generate both.

To use FFmpeg to convert my-animation.gif to a WebM video, run the following command in your console:

ffmpeg -i my-animation.gif -c vp9 -b:v 0 -crf 41 my-animation.webm

Replace the GIF image with a video

Animated GIFs have three key traits that a video needs to replicate:

  • They play automatically.
  • They loop continuously (usually, but it is possible to prevent looping).
  • They're silent.

Luckily, you can recreate these behaviors using the <video> element.

<video autoplay loop muted playsinline>  
<source src="my-animation.webm" type="video/webm">
<source src="my-animation.mp4" type="video/mp4">
</video>

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