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MOV to MKV Converter — Free, Online, No Upload

Media servers and open-source players love MKV — convert your Apple MOV files for a seamless Plex or Jellyfin library.

Free · no signup2 free files a day100% in-browser · no upload

Tap to select MOV files

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✓ Files never uploaded✓ 100% browser-based✓ No account required
Need the reverse?MKV → MOV

How to convert MOV to MKV online

  1. 1

    Drop your MOV file

    Drag your QuickTime Movie file onto the box above, or click it to pick a file.

  2. 2

    Wait a few seconds

    Conversion starts on its own and runs on your device, not on a server.

  3. 3

    Download your MKV

    Click Download to save the Matroska Video file.

MOV vs MKV: format overview

MOV

QuickTime Movie

Apple · 1991

Compression
lossy
Transparency
No
  • ✓ High quality, preferred by Apple ecosystem
  • ✓ Supports ProRes codec for editing
  • ✗ Poor Windows/Android compatibility without QuickTime
MKV

Matroska Video

Matroska.org · 2002

Compression
lossy
Transparency
No
  • ✓ Supports virtually any codec combination
  • ✓ Multiple audio tracks and subtitles per file

MOV magic bytes: 00 00 00 xx 66 74 79 70 71 74

MKV magic bytes: 1A 45 DF A3

Why convert MOV to MKV?

You've got iPhone footage, GoPro clips in MOV, or Final Cut Pro exports, and you want to add them to your Plex, Jellyfin, or Kodi media library without transcoding on the server. These media servers have excellent MKV support and often struggle or refuse to play MOV files without transcoding — which burns CPU cycles on your server and degrades the viewing experience for everyone on the network.

MKV (Matroska Video) is the open container standard for home media libraries. Plex and Jellyfin are built around it. Unlike MOV, which is Apple's proprietary container, MKV is an open format that any application can implement without licensing fees. It also supports multiple audio tracks, subtitle tracks, chapter markers, and embedded metadata — all of which MKV-aware media players expose correctly. Converting your MOV files to MKV makes them first-class citizens in any media server library.

If your MOV file contains H.264 or H.265 video with AAC audio — the codec combination used by every iPhone, GoPro, and most consumer cameras — the conversion is a remux: the video and audio streams are transferred to the MKV container without re-encoding. This means zero quality loss and very fast processing. Only MOV files with ProRes, MJPEG, or other codecs not native to MKV will require actual transcoding.

Quality & file size: MOV to MKV

Typical sizes (1 minute 1080p): MOV 150–500 MB → MKV 200–800 MB.

Frequently asked questions

What is MKV and why do media servers prefer it?
MKV (Matroska Video) is an open container format that supports multiple video, audio, and subtitle tracks, as well as chapter markers. Plex, Jellyfin, and Kodi have excellent MKV support and often prefer it to MOV.
Is MOV to MKV conversion lossless if I just remux?
If the video and audio codecs in the MOV are already MKV-compatible (H.264, AAC), the converter can remux without re-encoding, preserving exact quality. Otherwise, re-encoding occurs.

Your MOV file never leaves this tab — FormatDrop has no endpoint that receives file data. How it works