Compress WebM
Reduce WebM file size with VP9, AV1 or VP8. The result stays a WebM, ready for the web.
Compress WebM and keep it WebM
This WebM compressor re-encodes the video stream at a lower bitrate and leaves the result in the WebM container, so it still plays in a browser video tag without any conversion. The audio track is carried over as it is.
The quality slider sets the size: the new bitrate is a share of the original, so lower means smaller. VP9 is preselected, because it compresses far better than the older VP8 and still encodes at a reasonable speed. For MP4, MOV or MKV, use the video compressor.
VP9, AV1 or VP8 for a WebM
| Codec | Detail at the same size | Pick it when |
|---|---|---|
| VP9 Default | High | You want a small WebM that plays in every current browser. |
| AV1 | Highest | Viewers use recent browsers and phones, and you can wait longer for the encode. |
| VP8 | Lowest | An old player or device only accepts VP8. |
Choosing between WebM and MP4 in the first place? WebM vs MP4 compares size and support. What the codecs themselves do is in what is a codec.
Need an MP4 instead?
If a player or app will not take WebM, convert it to MP4 rather than compressing it.
Reduce WebM file size for the web and chat
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A video on a web page
VP9 at 1080p or 720p, with the slider in the middle, keeps the page light and the video clean.
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A clip for a chat app or a forum
Lower the slider until it fits the upload cap. Caps per app are in maximum file sizes.
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The smallest possible file
AV1 with a low slider, if the people watching use recent browsers.
How to compress a WebM file
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Drop the WebM
Pick a WebM video up to 1 GB. The panel shows its codec, bitrate, resolution and length.
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Set codec and quality
Keep VP9 or pick AV1, move the quality slider down for a smaller file and lower the resolution if you want it sharper at that size.
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Compress and download
Click Compress WebM and download the new file before its link expires.
WebM compressor questions
Yes. A WebM always comes back as a WebM, with VP9, AV1 or VP8 video and the original audio track.
At the same slider setting both files come out about the same size, but AV1 keeps more detail, so you can lower the slider further for the same look. The price is a slower encode and less support on older devices.
WebM is usually already efficient, and near the top of the slider the bitrate stays close to the original. Lower the slider, and keep your original if the result is not smaller.
Up to 1 GB per file, and 10 videos a day for free.