WebM to WMV Converter
Convert WebM to WMV free — no upload, no signup
To convert WebM to WMV, drop your WebM 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. Make WebM clips play in old Windows software.
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 WebM to WMV
Add your WebM videos
Drag and drop WebM 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 WMV, Fylo repackages the file instead of re-encoding it, with no quality loss.
Convert and download
Click Convert, then download each WMV file or all of them as one ZIP.
Why convert WebM to WMV?
Older Windows programs and PowerPoint versions can't play WebM files.
What happens when you convert WebM to WMV?
Fylo re-encodes to Windows Media Video 8 with WMA audio, which plays natively on Windows.
How does Fylo convert WebM to WMV?
Fylo reads the WebM with ffmpeg compiled to WebAssembly and writes Windows Media Video 8 (WMV2) with WMA2 audio in an ASF container. WebM's usual codecs (VP8, VP9, AV1) can't go into WMV 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 WebM and WMV?
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.
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.
Learn more: WebM format guide · WMV format guide
| Property | WebM | WMV |
|---|---|---|
| Developed by | Microsoft | |
| Introduced | 2010 | 1999 |
| Typical video codecs | VP8, VP9, AV1 | WMV 7/8/9 (VC-1) |
| Typical audio codecs | Vorbis, Opus | WMA |
| Plays in web browsers | Yes — Chrome, Edge, Firefox, Safari 14.1+ | No |
| Compatibility | Browsers, Android; limited in editors and on iPhone apps | Windows Media Player, Windows apps; poor on Mac and phones |
| Best for | Royalty-free web video, screen recordings | Old Windows software and PowerPoint presentations |
Frequently asked questions
Should I pick WMV or MP4?
MP4 is more universal; pick WMV only for legacy Windows software.
How long does it take?
Short clips take seconds; long HD recordings can take minutes.
Is my WebM file uploaded to a server?
No. Fylo runs ffmpeg, the same engine used by professional video tools, compiled to WebAssembly inside your browser. Your WebM file is read directly from your device and never sent anywhere.
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