Convert M4V to MKV
M4V is great for Apple TV, iTunes and iPhone video, but MKV is the better choice for movies with multiple audio tracks and subtitles. Convert M4V to MKV in seconds, right in your browser.
- No upload — 100% private
- Fast, lossless when possible
- Free & unlimited
- Works on iPhone & Android
Keep this tab open — the conversion runs on your device, nothing is uploaded.
Add more files above to keep converting.
How to convert M4V to MKV
- 1
Tap Choose files and select one or more M4V files (or drag them in).
- 2
Check that MKV is selected. Use Advanced options for resolution, size or trimming.
- 3
Press Convert. Everything happens on your device — no upload, no waiting in a queue.
- 4
Your MKV downloads automatically. Converting several files? Grab them all as a ZIP.
M4V vs MKV
Both formats are lossy, so the video is re-encoded once. Pick High quality to keep it as close to the original as possible, or Small for the smallest file.
| M4V | MKV | |
|---|---|---|
| Full name | iTunes Video | Matroska Video |
| Type | Video | Video |
| Compression | Lossy | Lossy |
| Developed by | Apple | Matroska.org |
| Introduced | 2003 | 2002 |
| Plays on iPhone | ✓ Yes | ✕ No |
| Plays on Android | ◐ Partly / with an app | ◐ Partly / with an app |
| Plays on Windows | ◐ Partly / with an app | ✓ Yes |
| Plays on Mac | ✓ Yes | ◐ Partly / with an app |
About M4V and MKV
M4V: M4V is Apple's MP4 variant used for iTunes movies and TV shows. Unprotected M4V files are identical to MP4.
MKV: MKV is a flexible open container that can hold unlimited video, audio and subtitle tracks. It is popular for movies and anime but isn't supported by iPhone or most TVs out of the box.
Frequently asked questions
How do I convert M4V to MKV on my phone?
Will converting M4V to MKV reduce quality?
Is this M4V to MKV converter free?
Are my files uploaded to a server?
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