MP4 to WMV converter

Older Windows software, PowerPoint 2007/2010 and some corporate systems still ask for Windows Media files.

Drop a MP4 file hereThe converter loads in your browser.

What happens to your MP4

H.264 video is re-encoded to WMV8 (wmv2) and AAC audio to WMA v2 inside an ASF container.

Tip: Modern PowerPoint (2013+) plays MP4 directly; only convert if the target software really requires WMV.

How to convert MP4 to WMV

  1. Drop your MP4 file on the box above, or tap it to pick one. The engine (about 31 MB) loads once per visit.
  2. The converter reads the file's streams and shows which codecs are inside.
  3. Keep the defaults, or pick a quality and resolution.
  4. Press the button, wait for the progress bar, then download your WMV.

Prefer the command line?

This is the FFmpeg command the converter runs for a typical MP4 (h264 + aac). Paste it into a terminal with FFmpeg installed for batch jobs or files too big for a browser tab:

ffmpeg -y -i input.mp4 -map 0:v:0 -map "0:a:0?" -sn -dn -vf "scale=trunc(iw/2)*2:trunc(ih/2)*2" -c:v wmv2 -q:v 5 -c:a wmav2 -b:a 160k output.wmv

This re-encodes, so expect it to take a while on long files. Your own file may contain different codecs; the converter above detects them and adapts. For other jobs, ask the FFmpeg command helper.

Questions

Is WMV9/VC-1 available?

No. The open-source FFmpeg encoder writes WMV7/WMV8; WMV9 encoding is Microsoft-only. WMV8 plays in every Windows Media Player.

Is my MP4 file uploaded?

No. The MP4 is read from your device by FFmpeg running as WebAssembly in the page, and the WMV is written back to your device. No server ever receives it.

Is there a size limit for MP4 to WMV?

We set none. The practical limit is browser memory: roughly 2 GB of output on a computer, and much less on phones.