Convert MPEG-4 Video (Apple) (.m4v) to Matroska Video (.mkv) online for free. Fast, secure video conversion with no watermarks or registration.
Conversion settings — add a file to adjust
Upload your .m4v file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .mkv file when it's ready.
M4V is Apple's MPEG-4 container with optional DRM support, while MKV (Matroska Video) is an open, highly flexible container format that can hold virtually any combination of video, audio, and subtitle streams. MKV supports advanced features like multiple audio tracks, soft subtitles in numerous formats (SRT, ASS, PGS), chapter markers, and attachments — all in a single file. Converting M4V to MKV unlocks these capabilities for use with media servers like Plex, Jellyfin, and Kodi.
MKV is the preferred container for media server ecosystems and enthusiast video collections. It supports features that MP4/M4V cannot: unlimited audio and subtitle tracks, fonts for styled subtitles, chapter markers with named sections, and nearly every video and audio codec ever created. If you are building a Plex or Jellyfin library from Apple content, MKV is the standard container that these systems handle best.
FFmpeg remuxes the M4V content into the Matroska container, typically using stream copy for both video (H.264) and audio (AAC) to avoid re-encoding. The H.264 and AAC streams are fully compatible with MKV, so this is a fast container-swap operation. Additional subtitle tracks can be merged in the same pass. MKV's header structure is more efficient for seeking than M4V, and the container adds no overhead compared to MPEG-4.
When using stream copy (recommended), there is zero quality loss — the video and audio bitstreams are transferred identically. MKV is purely a container change; it does not affect the encoded content. File sizes are nearly identical to the source M4V, often slightly smaller due to MKV's efficient header format.
| Device | M4V | MKV |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Native | Partial |
| iPhone/iPad | Native | Partial |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No |
Resolution: 1920x1080
Bitrate: 8-12 Mbps
H.264 recommended for fast processing
Resolution: 1080x1080
Bitrate: 3.5 Mbps
Square or 9:16 for Reels
Resolution: 1080x1920
Bitrate: 4 Mbps
9:16 vertical, under 60s ideal
Resolution: 1280x720
Bitrate: 5 Mbps
Under 140s, 512MB max
Resolution: 960x540
Bitrate: 2 Mbps
16MB limit for standard, 64MB for document
Resolution: 1280x720
Bitrate: 4 Mbps
M4V to MKV conversion is a fast, lossless container swap that unlocks MKV's superior subtitle support, multi-track capabilities, and media server compatibility. It is the ideal conversion for anyone moving Apple content into a platform-agnostic media library.
Saker overforing
HTTPS-krypterade uppladdningar
Integritet forst
Filer raderas automatiskt efter bearbetning
Ingen registrering
Borja konvertera direkt
Fungerar overallt
| No |
8MB free, 50MB Nitro
Valfri webblasare, valfri enhet
| Funktion | M4V | MKV |
|---|---|---|
| Fullstandigt namn | iTunes Video | Matroska Video |
| Filandelse | .m4v | .mkv |
| Bast for | Apple ecosystem | Multiple audio tracks |