Convert MP4 to WMV
For the PowerPoint deck, the old editing suite, or the Windows gadget that refuses anything newer — converted on your device, never uploaded.
Drop your video or audio here
or
MP4, MOV, WebM, MKV, AVI, MP3, WAV and more — any size, no upload
🔒 Files never leave your device — everything runs in your browser.
WMV requests come from a specific world: legacy Windows. Old versions of PowerPoint that only embed Windows Media video reliably, aging editing and kiosk software, media players from the Windows 7 era, and corporate systems that were certified once and never updated. When one of those is on the other end, this converter produces a standard WMV — Windows Media video with Windows Media audio in an ASF container — entirely in your browser.
Set expectations honestly: WMV's codecs are two decades older than what your MP4 likely carries, so matching the quality costs more megabytes, and the conversion is a full re-encode that takes real time on longer videos. If your target is a modern Windows machine that simply mislabels a playback error, try the MP4 in a different player first — WMV is the answer for genuinely old software, not for every Windows hiccup.
How it works
- Drop your file
Any common format, any size. Nothing is uploaded — the tool runs in your browser.
- Convert
Compatible files are repackaged instantly with zero quality loss; others are hardware-transcoded at high quality.
- Download
Your converted file is ready on your device — nothing to wait for, nothing to delete from a server.
Frequently asked questions
Which programs need WMV instead of MP4?
Mostly legacy Windows software: PowerPoint 2007/2010 (which embeds WMV far more reliably than MP4), Windows Movie Maker, old kiosk and signage players, and enterprise tools from the Windows 7 era. Anything released in the last decade almost certainly prefers MP4.
Why did the file get bigger after converting?
Your MP4 likely carries H.264 or newer; WMV's codec generation needs roughly twice the bitrate for similar quality. The size increase is the cost of compatibility with old decoders — unavoidable for any honest converter.
Will the WMV play sound correctly?
Yes — audio converts to Windows Media Audio, the matching codec of that ecosystem, so old players accept both streams without extra codec packs.
Is my file uploaded to a server?
No. ConvertUno runs entirely in your browser on your own device. Your file never leaves your computer or phone — there is no upload at all.
Is it really free, with no watermark?
Yes. Processing happens on your device, so serving you costs us almost nothing — no watermark, no account, no file-size limit, no daily quota.