WMV to MP4 Converter – Free, Fast & Private
Convert Windows Media Video (WMV) files to MP4 locally in your browser — your video never leaves your device
How to convert WMV to MP4
Choose or drag in your WMV file — nothing is uploaded, it stays on your device.
Click Start Converting — H.264 sources are rewrapped losslessly in seconds; other codecs are re-encoded to MP4 (H.264/AAC).
Download your standard MP4 file.
About WMV to MP4 conversion
WMV is Windows Media's own video format — it plays fine in old versions of Windows Media Player, but iPhones, Android, most editors and modern browsers won't touch it. This tool decodes the WMV/VC-1 video and re-encodes it to a standard H.264 MP4, entirely in your browser.
Frequently asked questions
WMV uses Microsoft's own WMV/VC-1 codecs, which iPhones, Android and macOS don't support natively. Converting to H.264 MP4 makes the video playable everywhere without installing anything.
The video is re-encoded to H.264 at a bitrate matched to the source, so visual quality is preserved for typical WMV recordings — screen captures, old camcorder exports and downloaded clips all convert cleanly.
No. The conversion runs entirely in your browser using WebAssembly (FFmpeg). Your file never leaves your device — that is also why there is no upload wait, no queue and no file-size pricing.
Up to 8GB on desktop browsers and 2GB on mobile. There is no limit on the number of files you convert, and no signup or watermark.
Yes — completely free and unlimited, with no watermark, no signup and no daily quota. Because the conversion runs on your own device instead of our servers, there are no processing costs to charge for.
If the source already contains H.264 video, the file is rewrapped without re-encoding and finishes in seconds, even for gigabyte files. Other codecs are re-encoded in parallel WebAssembly workers, which runs at roughly real-time speed on a modern computer.
Yes. It runs in any modern browser — Chrome, Safari, Edge or Firefox — on Windows, macOS, ChromeOS, Linux, iOS and Android. There is nothing to install.
AAC and MP3 audio is copied over unchanged. Other audio codecs (PCM from cameras, Vorbis, Opus…) are converted to AAC so the resulting MP4 plays everywhere.