MP4 to WMV Converter
Convert MP4 to WMV free — no upload, no signup
To convert MP4 to WMV, drop your MP4 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. WMV uses Windows Media Video 8 and WMA audio for older 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 MP4 to WMV
Add your MP4 videos
Drag and drop MP4 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 MP4 to WMV?
Older versions of PowerPoint, Windows Movie Maker and some corporate Windows systems play WMV most reliably. Converting avoids codec errors on those machines.
What happens when you convert MP4 to WMV?
Fylo re-encodes the video to WMV2 (Windows Media Video 8) and the audio to WMA2 inside an ASF container. These codecs are older and less efficient than H.264, so expect a larger file at similar quality. The video plays in Windows Media Player without extra codecs.
How does Fylo convert MP4 to WMV?
Fylo reads the MP4 with ffmpeg compiled to WebAssembly and writes Windows Media Video 8 (WMV2) with WMA2 audio in an ASF container. MP4's usual codecs (H.264, H.265/HEVC, 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 MP4 and WMV?
MP4 (MPEG-4 Part 14) is a container format standardised in 2001 and based on Apple's QuickTime file structure. A container holds separately compressed video and audio streams plus metadata such as subtitles, chapters and cover art. Most MP4s use H.264 video and AAC audio; newer files may use H.265 (HEVC) or AV1.
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: MP4 format guide · WMV format guide
| Property | MP4 | WMV |
|---|---|---|
| Developed by | MPEG (ISO/IEC 14496-14) | Microsoft |
| Introduced | 2001 | 1999 |
| Typical video codecs | H.264, H.265/HEVC, AV1 | WMV 7/8/9 (VC-1) |
| Typical audio codecs | AAC, MP3 | WMA |
| Plays in web browsers | Yes — every browser | No |
| Compatibility | Universal: phones, TVs, editors, social media | Windows Media Player, Windows apps; poor on Mac and phones |
| Best for | Sharing, uploading, streaming, editing | Old Windows software and PowerPoint presentations |
Frequently asked questions
Will a WMV play on a Mac?
Not in QuickTime. Mac users need VLC or another third-party player — MP4 is the better choice for Macs.
Is WMV good for PowerPoint?
Older PowerPoint versions on Windows embed WMV reliably. Modern PowerPoint handles MP4 perfectly too.
Is my MP4 file uploaded to a server?
No. Fylo runs ffmpeg, the same engine used by professional video tools, compiled to WebAssembly inside your browser. Your MP4 file is read directly from your device and never sent anywhere.
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