MOV to MKV Converter
Convert MOV to MKV free — no upload, no signup
To convert MOV to MKV, drop your MOV video into the box below and click Convert. Fylo converts with ffmpeg running inside your browser, so nothing is uploaded and there's no signup or watermark. MKV takes the MOV's streams as-is — fast and lossless.
Drop videos here
or tap to browse · paste with Ctrl+V · add many at once
Your files never leave your device
If the video already uses codecs that fit the new format, Fylo repackages it instantly with no quality loss.
Advanced
How to convert MOV to MKV
Add your MOV videos
Drag and drop MOV files into the box or tap to choose them. The converter engine (about 31 MB) downloads once, the first time you convert.
Choose quality (optional)
Balanced quality suits most videos. If the codecs already fit MKV, Fylo repackages the file instead of re-encoding it, with no quality loss.
Convert and download
Click Convert, then download each MKV file or all of them as one ZIP.
Why convert MOV to MKV?
Archiving footage for Plex, Jellyfin or Kodi, or adding extra subtitle and audio tracks later, is easier in MKV, which accepts every codec.
What happens when you convert MOV to MKV?
Fylo copies MOV video and audio straight into Matroska without re-encoding, so even ProRes or HEVC footage converts quickly and keeps its exact quality. File size is essentially unchanged.
How does Fylo convert MOV to MKV?
Fylo reads the MOV with ffmpeg compiled to WebAssembly and writes a straight copy of every stream — Matroska accepts any codec, so nothing is re-encoded. Every conversion to MKV is a lossless repackage, so it finishes in seconds even for large files. Only the first video and audio track are kept, and the original resolution is preserved unless you pick 1080p, 720p or 480p under Advanced.
What's the difference between MOV and MKV?
MOV is the QuickTime File Format that Apple introduced in 1991. MP4 was later standardised on the same structure, so the two are close relatives. iPhones record MOV files (usually H.264 or HEVC video with AAC audio), and professional cameras and editors use MOV for high-quality ProRes footage.
MKV is the Matroska container, an open standard first released in 2002. It can hold virtually any video, audio or subtitle codec, and any number of tracks — so one file can carry several languages, director's commentary and subtitles. WebM is a restricted subset of Matroska.
Learn more: MOV format guide · MKV format guide
| Property | MOV | MKV |
|---|---|---|
| Developed by | Apple | Matroska project (open standard) |
| Introduced | 1991 | 2002 |
| Typical video codecs | H.264, HEVC, ProRes | Any: H.264, HEVC, VP9, AV1… |
| Typical audio codecs | AAC, PCM | Any: AAC, Opus, FLAC, DTS, AC-3… |
| Plays in web browsers | Partly (Safari; others only if H.264) | Partly (Chrome/Edge for some codecs) |
| Compatibility | Apple devices, editors; limited on Windows and Android | VLC, Plex, Kodi, most smart TVs; not iPhone or many editors |
| Best for | iPhone videos, professional editing (ProRes) | Movies with multiple audio and subtitle tracks |
Frequently asked questions
Will Final Cut Pro open MKV?
No — keep the MOV for editing. MKV is for playback and archiving.
Does MKV keep iPhone HDR?
The HEVC stream and its HDR metadata are copied unchanged, but whether HDR displays depends on your player.
Is my MOV file uploaded to a server?
No. Fylo runs ffmpeg, the same engine used by professional video tools, compiled to WebAssembly inside your browser. Your MOV file is read directly from your device and never sent anywhere.
Related tools
Updated