Convert WMV to MP4

Convert WMV to MP4 online. Windows Media Video files from old Windows apps and cameras become H.264 MP4 that plays on any device. No upload.

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Why convert WMV to MP4?

MP4 is the most widely supported video format. Converting from WMV fixes "unsupported file" errors on phones, social sites, presentation apps and video editors.

How the conversion works

The WMV video is decoded and re-encoded to H.264 with AAC audio. That combination plays on nearly every phone, browser, TV and editor.

What is a WMV file?

WMV is Windows Media Video, Microsoft's format from the Windows XP and Windows Movie Maker era. The video inside uses WMV7, WMV8 or WMV9 codecs and the audio uses WMA. Windows Media Player opens it, but Macs, iPhones, Android phones, smart TVs and most web services don't.

How to convert WMV to MP4

Drop the .wmv files above and press Convert all. FFmpeg, running as WebAssembly in your browser, decodes the Windows Media video and audio and encodes H.264 video at CRF 23 with AAC audio at 160 kbps in an MP4. The first run downloads the FFmpeg engine. Download each MP4 or the whole batch as a ZIP.

Protected WMV files

Some WMV files bought or rented from old online stores are locked with Windows Media DRM. Those can't be decoded by any converter that respects the protection, including this one. Unprotected home videos, exported Movie Maker projects and screen recordings convert normally.

Encoding happens on your device

Video encoding runs in this browser tab, on your own device. There is no upload and no queue. Your device does all the work, so a large or long clip can take a minute or more.

Before you start

Input: WMV. Output: MP4. The settings appear before anything runs, so you can check them first. Your original file is never changed.

Video work uses a lot of memory and CPU. Try a short clip first and check that the sound and playback work. On a phone, split large batches into smaller ones.

Keep the original until you have opened and checked the result. The work happens in this browser tab, so the size you can handle depends on your device's memory, your browser and the file itself.