Convert AVI to WebM
Need an old AVI clip on a website? Convert it to WebM with VP9 video and Opus audio – the open, royalty-free format every modern browser plays.
- No upload
- No watermark
- No file size limit
- Hardware accelerated
Drop videos here to convert them
MP4, MOV, WebM, MKV, AVI and more · no size limit or watermark
Processed on your device. Your videos are never uploaded.
Advanced: codec, frame rate, audio, trim
How to convert AVI to WebM
- 1
Add your AVI file
Drop one or more .avi videos onto the tool.
- 2
WebM with VP9 is preset
Video is encoded to VP9 and audio to Opus, the standard combination for WebM.
- 3
Convert on your device
The compatibility engine downloads once (about 30 MB) and encodes in software – best done on a computer.
- 4
Download and embed
Save the .webm file and use it in a video tag on your site.
Why WebM for the web
WebM is an open format developed for HTML5 video. VP9 video is clearly more efficient than the DivX and Xvid codecs found in most AVI files, so the converted clip is usually much smaller at the same quality, and WebM plays in Chrome, Edge, Firefox and current Safari.
For the widest support, many sites publish WebM with an MP4 fallback. You can create the MP4 version with the AVI to MP4 converter.
Speed expectations
Browsers can’t read AVI, so this conversion uses FFmpeg running as WebAssembly on your processor, and VP9 encoding in software is demanding. A short clip takes a minute or two on a laptop; a long video takes considerably longer. If you only need the video to play everywhere, AVI to MP4 is faster.
Your file is never uploaded, so the speed depends only on your device – not on a server queue or your internet connection.
Background and hero videos
For a muted background video on a website, remove the audio under Advanced and choose a lower quality such as Balanced. A short loop without sound can be a fraction of the original size, which keeps your page fast.
Frequently asked questions
Is WebM better than MP4?
For websites, WebM with VP9 is often smaller at the same quality. MP4 with H.264 plays in more apps and on more devices outside the browser.
Does Safari play WebM?
Current versions of Safari on macOS and iOS play WebM with VP9. Very old Apple devices don’t, which is why an MP4 fallback is still common.
Can I choose AV1 instead of VP9?
The AV1 option works when your browser can read the source itself, for example MP4 or WebM files. AVI files go through the compatibility engine, which always encodes WebM as VP9.
Are my files uploaded?
No. The conversion happens entirely in your browser.
Related tools
AVI to MP4
AVI files from old cameras, DivX and Xvid downloads or Windows-era recordings often won’t play on phones or in browsers. Convert them to MP4 right on your device.
MP4 to WebM
WebM with VP9 or AV1 is built for the web: smaller files at the same visual quality, supported by every modern browser. Convert your MP4s locally.
WebM to MP4
WebM files from screen recorders and browsers often won’t open in editors, on iPhones or in PowerPoint. Convert them to universally compatible MP4 in your browser.
Video converter
Change a video’s format in seconds. When the codecs allow it, the streams are copied without re-encoding, so the quality stays exactly the same.
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