Convert QT to MKV — Free Online Converter
Convert QuickTime (.qt) to Matroska Video (.mkv) online for free. Fast, secure video conversion with no watermarks or registration....
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How to Convert
Upload your .mov 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.
About MOV to MKV Conversion
MKV (Matroska Video) is an open-source container format that can hold virtually unlimited numbers of video, audio, subtitle, and metadata tracks in a single file. Named after Russian matryoshka nesting dolls, it's the most flexible multimedia container available. Converting QT to MKV moves content from Apple's proprietary container into an open standard that excels at preserving complex multimedia structures without codec transcoding.
Why Convert MOV to MKV?
MKV accepts nearly every codec in existence, meaning QT content can often be remuxed (repackaged without re-encoding) for zero quality loss and near-instant conversion. MKV also supports unlimited subtitle tracks, multiple audio languages, chapter markers, and rich metadata — features that QT handles inconsistently. For archival and multi-language content, MKV is the superior container.
Common Use Cases
- Preserving QT files with multiple audio tracks (commentary, languages) in a single container
- Archiving QT content in a future-proof open container with rich metadata
- Adding subtitle tracks to QT video for accessibility without re-encoding
- Converting ProRes QT files for playback on VLC, Kodi, and Plex media servers
- Packaging QT video with chapter markers for organized long-form content
How It Works
FFmpeg remuxes the QT content into Matroska's EBML (Extensible Binary Meta Language) structure. If the QT video uses H.264 or HEVC, the video stream is usually copied directly without re-encoding. ProRes and other less common codecs can also be stored in MKV but may require compatible decoders. Audio streams are typically copied as-is. Multiple tracks and chapters are mapped from QT atoms to MKV elements.
Quality & Performance
When remuxing (stream-copying), quality is identical to the source — not a single bit of video or audio data changes. The process simply moves the data from QT's atom structure to MKV's EBML structure. Remuxing a 1-hour file typically takes under 30 seconds.
Device Compatibility
| Device | MOV | MKV |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No | No |
Recommended Settings by Platform
YouTube
Resolution: 1920x1080
Bitrate: 8-12 Mbps
H.264 recommended for fast processing
Resolution: 1080x1080
Bitrate: 3.5 Mbps
Square or 9:16 for Reels
TikTok
Resolution: 1080x1920
Bitrate: 4 Mbps
9:16 vertical, under 60s ideal
Twitter/X
Resolution: 1280x720
Bitrate: 5 Mbps
Under 140s, 512MB max
Resolution: 960x540
Bitrate: 2 Mbps
16MB limit for standard, 64MB for document
Discord
Resolution: 1280x720
Bitrate: 4 Mbps
8MB free, 50MB Nitro
Tips for Best Results
- 1Always try remuxing first (stream copy) — it's lossless and finishes in seconds. Only re-encode if you need to change codecs or resolution.
- 2Use MKV's chapter support to add navigation points to long QT recordings like lectures, concerts, or multi-part presentations.
- 3If you plan to stream via Plex or Jellyfin, MKV is the native preferred format — it avoids unnecessary transcoding on the server.
- 4Embed multiple subtitle files (SRT, ASS) during conversion rather than keeping them as separate files — MKV keeps everything organized in one file.
Related Conversions
QT to MKV conversion leverages Matroska's unmatched flexibility to preserve or enhance the multimedia structure of your QuickTime content. With near-instant remuxing and zero quality loss, it's an ideal conversion for archival and multi-platform playback.