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AVI vs WebM
AVI is a container often found in existing Windows-era video assets and workflows. WebM is a container focused on web delivery. Check the codecs inside and support along the delivery path.
Which format should you choose?
Keep AVI when maintaining an existing AVI-based workflow. Consider WebM for new web video delivery after verifying support in target browsers, devices, and publishing tools.
Good fit for AVI
Legacy video workflows
- Maintaining files required by an established AVI workflow
Good fit for WebM
Web video delivery
- Serving video encoded for a browser and platform known to accept it
Basic information
| Field | AVI | WebM |
|---|---|---|
| Extension | .avi | .webm |
| MIME type | video/x-msvideo | video/webm |
| Common uses | Legacy video workflows | Web video delivery |
| How to open | Open in a compatible player and inspect the audio and video codecs if playback fails. | Open in a compatible browser or player and inspect video and audio codecs if playback fails. |
| Export or convert | For sharing, convert to a suitable MP4 or WebM profile and check picture, sound, subtitles, and sync. | MP4 conversion may require re-encoding; verify output quality, audio, and target playback. |
Choose by use case
Maintaining files required by an established AVI workflow
Legacy video workflows
AVIServing video encoded for a browser and platform known to accept it
Web video delivery
WebMKey point 1
AVI is based on RIFF and can contain different audio and video codecs.
More on the differencesKey point 2
WebM targets web media and can carry combinations such as VP8, VP9, or AV1 video with Vorbis or Opus audio.
More on the differencesMore on the differences
Do not infer codec or playback support from the extension alone. Test the actual container and codec combination, and inspect picture, sound, captions, and sync after conversion.
- AVI playback and size vary with the codecs stored inside.
- WebM may suit web delivery, but compatibility depends on browser, device, CMS, and codec support.
- Conversion may require re-encoding, which can affect quality and take time.
Frequently asked questions
Is WebM always smaller than AVI?
No. Container names do not determine size; codecs, settings, resolution, and source material matter.