WMV to WebM Converter
Convert WMV to WebM free — no upload, no signup
To convert WMV to WebM, drop your WMV video into the box below and click Convert. Fylo converts with ffmpeg running inside your browser, so nothing is uploaded and there's no signup or watermark. Turn Windows Media video into web-ready WebM.
Drop videos here
or tap to browse · paste with Ctrl+V · add many at once
Your files never leave your device
If the video already uses codecs that fit the new format, Fylo repackages it instantly with no quality loss.
Advanced
How to convert WMV to WebM
Add your WMV videos
Drag and drop WMV files into the box or tap to choose them. The converter engine (about 31 MB) downloads once, the first time you convert.
Choose quality (optional)
Balanced quality suits most videos. If the codecs already fit WebM, Fylo repackages the file instead of re-encoding it, with no quality loss.
Convert and download
Click Convert, then download each WebM file or all of them as one ZIP.
Why convert WMV to WebM?
Browsers can't play WMV. WebM works with the HTML5 video tag.
What happens when you convert WMV to WebM?
Fylo re-encodes to VP8 video and Vorbis audio.
How does Fylo convert WMV to WebM?
Fylo reads the WMV with ffmpeg compiled to WebAssembly and writes VP8 with Vorbis audio, using libvpx's real-time preset so encoding stays practical in a browser. WMV's usual codecs (WMV 7/8/9 (VC-1)) can't go into WebM as-is, so the video is re-encoded. Speed depends on your device: short phone clips take seconds, while on our slow test PC a 2-minute 1080p video took about 10 minutes. Only the first video and audio track are kept, and the original resolution is preserved unless you pick 1080p, 720p or 480p under Advanced.
What's the difference between WMV and WebM?
WMV (Windows Media Video) is a family of Microsoft video codecs introduced in 1999, stored in the Advanced Systems Format (ASF) container together with WMA audio. WMV 9 was standardised as VC-1 and used on HD DVD and early Blu-ray discs.
WebM was announced by Google in 2010 as an open, royalty-free alternative to H.264 for HTML5 video. It's a subset of Matroska restricted to VP8, VP9 or AV1 video and Vorbis or Opus audio. Browser screen recorders and many web tools save WebM by default.
Learn more: WMV format guide · WebM format guide
| Property | WMV | WebM |
|---|---|---|
| Developed by | Microsoft | |
| Introduced | 1999 | 2010 |
| Typical video codecs | WMV 7/8/9 (VC-1) | VP8, VP9, AV1 |
| Typical audio codecs | WMA | Vorbis, Opus |
| Plays in web browsers | No | Yes — Chrome, Edge, Firefox, Safari 14.1+ |
| Compatibility | Windows Media Player, Windows apps; poor on Mac and phones | Browsers, Android; limited in editors and on iPhone apps |
| Best for | Old Windows software and PowerPoint presentations | Royalty-free web video, screen recordings |
Frequently asked questions
WebM or MP4 for the web?
MP4 has the widest support; WebM is royalty-free.
Will DRM files work?
No.
Is my WMV file uploaded to a server?
No. Fylo runs ffmpeg, the same engine used by professional video tools, compiled to WebAssembly inside your browser. Your WMV file is read directly from your device and never sent anywhere.
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