Convert WMV to MP4 — no upload needed

WMV plays fine on an old Windows PC and nowhere else. OpenConvertVideo converts it to MP4 right in your browser, so PowerPoint exports and Movie Maker clips finally open on a Mac, an iPhone, or anything else you own.

Convert WMV to MP4 →
  • No upload wait
  • Nothing leaves your device
  • Free, no account
  • No artificial size limits

Where these files come from

WMV — Windows Media Video — is Microsoft's own format, built around the VC-1 or WMV codec inside an ASF container. It was the default output for a specific slice of Windows software: PowerPoint's "Create a Video" export, Windows Movie Maker projects, screen recordings made with Windows' built-in tools, and video handed down from an old office PC.

None of that made it a bad format for its time. It just never had a life outside Windows.

The Mac and iPhone wall

This is where WMV actually causes problems. AirDrop a .wmv file to a Mac and QuickTime won't open it. Text or email it to an iPhone and Photos refuses to import it. Apple never licensed VC-1 playback, so the wall isn't a bug or a missing setting — it's permanent, on every Apple device, at every version of the OS.

Modern editors are just as unfriendly. DaVinci Resolve, CapCut, and most phone editing apps don't recognize WMV either, so even where the file plays, you often can't cut it.

Converting doesn't mean uploading

A lot of WMV files are things people would rather not hand to a random website — old PowerPoint decks with client information, screen recordings from a work laptop, home video shot in someone's living room. OpenConvertVideo decodes the WMV with ffmpeg compiled to WebAssembly and re-encodes it to MP4 inside your browser tab — we only supply that code; your own device does the actual converting. The file is read from your disk, converted, and saved back to your disk — you can open your browser's Network tab and watch that nothing goes out. That old file stays 100% private, exactly as it should.

What the MP4 gives you

  • H.264 video in an MP4 container, with AAC audio.
  • Plays natively on Mac, iPhone, Android, and smart TVs — not just Windows.
  • Opens cleanly in Premiere, Final Cut, DaVinci Resolve, and CapCut.
  • Free, no account, and no imposed limit on file size.

Frequently asked questions

What is a WMV file?
WMV (Windows Media Video) is Microsoft's older video format, built on the VC-1 or WMV codec inside an ASF container. It's what PowerPoint produces when you export a presentation as video, and it's the default output of Windows Movie Maker and many Windows screen recorders.
Why won't my WMV file open on a Mac or iPhone?
Apple never built VC-1 support into macOS or iOS, so QuickTime, Photos, and iOS itself simply don't recognize the codec inside a WMV file. It isn't a settings problem — Apple devices have never been able to play WMV natively, at any OS version.
How do I convert WMV to MP4?
Choose your .wmv file in the converter, set the output to MP4 (H.264), and start the conversion. It runs entirely in your browser, so there's no upload wait — you get a finished MP4 in the same tab, ready to save or share.
Will converting change the quality?
The High preset re-encodes with essentially no visible loss. Most WMV files were already recorded at modest bitrates for PowerPoint or screen capture, so the MP4 will look the same as the original — just playable on far more devices.
Is my file actually private?
Yes. The WMV is decoded and re-encoded on your own device using a WebAssembly build of ffmpeg, so old business decks or personal recordings never travel anywhere. Nothing uploads to a server — you can open your browser's Network tab during conversion and confirm no data leaves your machine.

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