Add your M4V file
Drop one or more .m4v files onto the converter above, or browse for them. They load into browser memory only — nothing is uploaded, so there is no size-based pricing and no server queue.
M4V to WMV
Pulling the soundtrack out of a .m4v video into .wmv audio keeps what you can hear and drops the picture entirely. Free, private, and validated — the file never leaves your browser.
Private for supported formats — processed in your browser
Runs on your deviceConvert supported files
Drop M4V files here
Batch files can each use a different output. Nothing uploads for local conversions.
Working inputs include camera RAW, browser-local audio/video, PDF, CBZ/CBR comics, office documents, ebooks, markup, 3D models, structured text, images, and archives.About converting MPEG-4 video to Windows Media video
Pulling the soundtrack out of a .m4v video into .wmv audio keeps what you can hear and drops the picture entirely. An .m4v file is Apple's flavor of the MPEG-4 container, used by iTunes for movies, TV episodes, and music videos. Structurally it is almost identical to .mp4, but the .m4v extension signaled iTunes-specific features such as chapter markers and, on purchased content, FairPlay copy protection.
A .wmv file contains Windows Media Video, Microsoft's proprietary codec family, almost always wrapped in an ASF container. The extension was everywhere on Windows XP-era PCs, from downloaded clips to Movie Maker exports, but it has faded as MP4 became universal. For this route the practical draw is excellent support across legacy Windows software and vC-1 encodes hold up reasonably well for their age — balanced against effectively abandoned by Microsoft itself, which is worth knowing before you commit a large batch.
Why convert M4V to WMV?
The usual reason to take .wmv audio out of a .m4v file is that only the sound matters — a talk, interview, song, or podcast segment. Keeping the video stream would waste storage, and a dedicated audio file is easier to trim, tag, and play. On the source side, fairPlay-protected files play only in Apple apps on authorized devices, and no converter can open them; on the target side, the payoff is excellent support across legacy Windows software, which is exactly what you want for playing old Movie Maker projects and family archives.
M4V vs WMV at a glance
| Aspect | MPEG-4 video (.m4v) | Windows Media video (.wmv) |
|---|---|---|
| Format type | Container — quality depends on the codecs and settings inside | Container — quality depends on the codecs and settings inside |
| How it stores data | identical ISO base media layout to MP4, distinguished only by branding atoms and the extension | aSF container carrying WMV1, WMV2, or WMV3 (VC-1) video, typically with WMA audio |
| Strongest at | playing back iTunes-era video libraries | playing old Movie Maker projects and family archives |
| Weak spot | fairPlay-protected files play only in Apple apps on authorized devices, and no converter can open them | effectively abandoned by Microsoft itself |
| Metadata | full iTunes atom metadata: title, show, season, episode, artwork, chapters, and content ratings | aSF content-description attributes hold title, author, copyright, and rating fields, plus extended attributes used by Windows Media Player libraries |
Pick WMV as the output
Select .wmv in the output menu next to each file. The menu only offers targets this engine can genuinely produce, so if WMV is selectable, the route is real and validated.
Convert on your device
Press Convert. A WebAssembly FFmpeg build demuxes the audio track and re-encodes it locally; the video stream is simply discarded.
Verify and download
Each result is signature-checked before the download unlocks, so a failed encode can never masquerade as a valid WMV file. Outputs keep the original filename with the .wmv extension.
M4V to WMV questions, answered
Will converting M4V to WMV lose quality?
Since m4v is container-oriented and wmv is container-oriented, the conversion preserves the source content exactly as stored; no additional compression pass is applied beyond what .wmv itself requires.
Is it private to convert M4V files here?
Yes — the .m4v file is processed inside your browser tab and never uploaded. A WebAssembly FFmpeg build demuxes the audio track and re-encodes it locally; the video stream is simply discarded. Close the tab and the file is gone from memory.
Where will the WMV file work?
Windows 10 and 11 still play .wmv out of the box, but macOS dropped support after the QuickTime plugin era ended, and no browser or mobile OS will touch it. Conversion to MP4 is required for web or cross-platform use.
Will the WMV file be bigger or smaller than my M4V?
Much smaller — the video stream is usually 80–95% of a .m4v file's weight, and it is discarded entirely. The remaining audio is re-encoded at the bitrate implied by your quality setting.
What happens to the metadata in my M4V file?
This converter strips container metadata deliberately (the FFmpeg command runs with metadata mapping disabled) so exported files do not leak recording details. In the source, full iTunes atom metadata: title, show, season, episode, artwork, chapters, and content ratings; none of it is transmitted anywhere because the file never leaves your browser.
Can I convert WMV back to M4V?
Yes — the reverse route exists as a separate tool. Bear in mind that round-tripping .m4v → .wmv → .m4v is not a perfect undo when any lossy step is involved; keep your original if fidelity matters.