Convert M4V to MKV
Convert M4V files to MKV locally, completely free and with maximum privacy.
Drag and drop your files here
or click to browse local files (large files supported, limited only by browser RAM)
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How to convert M4V to MKV
- Drop your .m4v files above, or click Upload Files. You can add many files at once.
- MKV is already selected as the output. Open the settings (gear icon) to fine-tune the result.
- Click Convert All. FFmpeg runs inside your browser through WebAssembly; nothing is uploaded.
- Download your .mkv files as soon as each one finishes.
What to know about M4V to MKV conversion
- The video is re-encoded to H.264 video and AAC audio so it plays wherever MKV is supported, and odd frame sizes are adjusted automatically.
- You can change the resolution, frame rate, playback speed and quality (CRF) before converting.
M4V vs MKV
| Feature | M4V (Apple MPEG-4 Video) | MKV (Matroska Video) |
|---|---|---|
| Codecs used by PureConverter | H.264 video and AAC audio | H.264 video and AAC audio |
| Best for | iTunes and Apple TV libraries | movies with several audio and subtitle tracks |
| Opens in | Apple TV app, iTunes and VLC, mpv and most media players | VLC, mpv and most media players, Plex and most smart TVs |
M4V (Apple MPEG-4 Video): An MPEG-4 video container used by Apple for iTunes and iOS devices.
MKV (Matroska Video): A flexible, open-standard video container format that can hold unlimited video, audio, picture, or subtitle tracks.
Conversion options
- Resolution: original, 1080p, 720p, 480p or 360p
- Frame rate and playback speed (0.5× to 2×)
- Quality presets or a custom CRF value, and lossless mode
- Audio bitrate, sample rate and channels
Frequently asked questions
Is it safe to convert M4V to MKV here?
Yes. Your files are processed entirely on your own device by WebAssembly code running in the browser. They are never uploaded, so nobody else can see them, and the converter keeps working even if your connection drops after the page loads.
Is there a file size limit?
There is no server-side limit. The only limit is the memory available to your browser, typically 1.5–4 GB on desktop computers.
Can I convert several M4V files at once?
Yes. Add as many files as you like; they are converted in parallel according to your device's CPU cores, and you can apply the same settings to all of them.
Related conversions
Need the opposite? Convert MKV to M4V.
Convert M4V to other formats
- M4V to MP4
- M4V to MP3
- M4V to WEBP
- M4V to GIF
- M4V to WAV
- M4V to MOV
- M4V to M4A
- M4V to FLAC
- M4V to WEBM
- M4V to AAC
- M4V to OGG
- M4V to OPUS
Convert other formats to MKV
- MP4 to MKV
- MOV to MKV
- WEBM to MKV
- AVI to MKV
- WMV to MKV
- FLV to MKV
- MPEG to MKV
- TS to MKV
- 3GP to MKV
- OGV to MKV
See every M4V converter and MKV converter, or browse the full converter directory.