Convert WMV to MP4
Old Windows Media videos do not play on phones or Macs. Turn them into MP4 right here. It is slower than other formats, and the page tells you why.
- Free
- No sign-up
- No upload
How to convert WMV to MP4
- Drop your WMV file above.
- Pick 720p or 480p if you also want a smaller file.
- Click Convert to MP4. The first time, the converter (about 31 MB) is downloaded.
- Keep the tab open until it finishes, then download the MP4.
Why it is slow
Browsers cannot read WMV
There is no WMV decoder in Chrome, Safari or Firefox, so FFmpeg (compiled for the web) unpacks every frame on your processor.
How long
On a PC, a 10-minute 720p video takes about 4 minutes and 1080p about 8. Phones and older laptops take longer.
Large files
Everything runs in browser memory, so files over about 1 GB may stop. Shorter files are safer.
FAQ
Why is WMV slower than MOV or MKV?
Browsers have built-in decoders for modern formats but not for WMV, so it has to be decoded in software. The MP4 encoding itself is still done by your browser.
Will the sound be kept?
Yes. Sound is converted to AAC, which plays on every device.
Can I do something else while it runs?
Yes, but keep this tab open. Switching to other heavy apps may slow it down.
Is my video uploaded?
No. FFmpeg runs inside your browser, so your file is never sent anywhere.
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