AVI to WebM (VP9) - Online Video Converter
Convert AVI to WebM (VP9) online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.
About AVI to WebM (VP9)
AVI is Microsoft's 1992 container, often holding DivX or DV video with MP3 or PCM sound. WebM re-encodes the picture to VP9 with Opus audio for open web playback, including an alpha channel the source lacks. Old codecs inside must fully decode before re-encoding, so conversion takes a while on long files. Apple editors accept the result unevenly, so keep an MP4 copy for editing round-trips. Pick the audio track first where the source carries several.
Why convert AVI to WebM (VP9)?
- Smaller files with WebM lossy compression.
- Keep animation and transparency where supported.
- Private, no upload - runs in your browser.
AVI vs WebM (VP9)
| Animation | Yes | Yes |
|---|---|---|
| Transparency | No | Yes |
| Compression | lossy | lossy |
| Typical use | AVI is Microsoft's 1992 RIFF container, often holding DivX or DV video. | WebM pairs VP9 video with Opus audio and supports an alpha channel. |
When not to convert AVI to WebM (VP9)
- Skip WebM for archival masters: lossy compression discards detail, so keep the AVI original.
- Keep a master copy: repeated exports stack small losses, so archive AVI before batch WebM shares.
Limits
Starting point: AVI - AVI is Microsoft's 1992 RIFF container, often holding DivX or DV video. Old codecs inside may need transcoding before modern players open them. Apple editors accept it unevenly; keep MP4 for editing round-trips. Encode WebM (VP9 / Opus) from AVI at a bitrate near the source, and confirm the audio track before converting.
How conversion works
Conversion runs entirely in your browser with FFmpeg WASM. Files never leave your device.