Convert WebM to AVI
Convert WebM video files to AVI format directly in your browser. AVI is the container expected by older Windows Media Player builds, classic Sony Vegas projects, and many DVD authoring tools that don't accept WebM. No upload needed.
Drag 'n' drop files here, or
click to select files
.webm
Drop your files and click Convert to get AVI
//when_to_use
When to Convert WebM to AVI
- Converting Loom screen recordings (WebM) to AVI for editing in older Sony Vegas Pro builds
- Preparing WebM clips for DVD authoring tools like DVD Flick that only accept AVI input
- Converting OBS WebM recordings to AVI for embedding in older PowerPoint presentations on Windows 7/8
- Migrating WebM training videos to AVI for playback on industrial Windows kiosks and signage hardware
- Converting Google Meet WebM exports to AVI for archive systems that only index AVI files
//comparison
WEBM vs AVI
| Property | WEBM | AVI |
|---|---|---|
| Container | WebM (Matroska subset) | AVI (RIFF, 1992) |
| Video codec | VP9 or VP8 | H.264 (CRF 23) |
| Audio codec | Vorbis or Opus | MP3 192kbps |
| File size | Smaller (efficient) | 20-50% larger |
| Modern support | All current browsers | Legacy / desktop only |
| Best for | Web embedding | Legacy Windows software |
//how_it_works
How It Works
Drop your WebM files
Drag and drop or select WebM files. First use loads FFmpeg WASM (~30MB).
FFmpeg decodes WebM
FFmpeg WASM parses the WebM container and decodes VP8/VP9 video and Vorbis/Opus audio streams to raw frames and PCM samples.
H.264 + MP3 re-encode
Video is re-encoded with libx264 at CRF 23; audio is encoded to MP3 at 192kbps with LAME. Streams are muxed into the AVI container.
Download your AVI files
Your AVI plays in Windows Media Player, VLC, MPC-HC, and any legacy Windows tool that expects the AVI container.
// under the hood
WebM is an open container holding VP8 or VP9 video and Vorbis or Opus audio. AVI is the legacy Microsoft Audio Video Interleave container, originally a Video for Windows format. Our converter uses FFmpeg WASM to demux the WebM input, decode VP8/VP9 video and Vorbis/Opus audio to raw frames and PCM, then re-encode video to H.264 at CRF 23 with libx264 and audio to MP3 at 192kbps using LAME, before muxing into the AVI container.
//faq
Frequently Asked Questions
- Why would I convert WebM to AVI?
- AVI is a 1992 Microsoft container that older Windows software still expects: pre-2015 Windows Media Player, classic Sony Vegas projects, certain DVD/Blu-ray authoring tools, and some industrial/embedded playback devices. WebM is too modern for these — converting to AVI with H.264 video and MP3 audio gives you a file they will accept.
- What codecs end up inside the AVI?
- We use H.264 video at CRF 23 with libx264 and MP3 audio at 192kbps. AVI's audio support for AAC is historically buggy in old players, so MP3 is the safer choice. Modern players (VLC, MPC-HC) handle this combination natively.
- Will I lose quality going from WebM to AVI?
- Yes, slightly. WebM uses VP9 or VP8, AVI is wrapping a separate H.264 encode, so this is a transcoding step. We pick CRF 23 which is visually transparent for almost all source material — the result looks indistinguishable from the WebM original.
- Why is the AVI bigger than the WebM?
- VP9 in modern WebM compresses about 20-40% better than H.264 at the same visual quality. AVI also has higher container overhead than WebM. Expect the AVI to be 20-50% larger than the WebM source.
- Are my WebM files uploaded anywhere?
- No. FFmpeg WebAssembly runs entirely inside your browser tab. Your WebM video never leaves your device.
//related_converters
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→Convert MP4 to MP3
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→Convert MOV to MP4
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→