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MOVMKV

Convert MOV to MKV

This free MOV to MKV converter changes your QuickTime Movie (.mov) file into a Matroska Video (.mkv) file, right in your browser. There is nothing to install, no account to create, and no limit on how many files you convert.

100% private. Your file is processed locally in your browser with WebAssembly — it is never uploaded to a server, stored, or seen by anyone.

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The conversion runs on your own device using ffmpeg compiled to WebAssembly (ffmpeg.wasm), so your file is never uploaded to a server. MKV is best for archiving with multiple tracks and subtitles, which is the usual reason to convert from MOV.

Why convert MOV to MKV?

  • Note: MKV has narrower support than MOV - convert only when a specific app or workflow needs it.
  • The video is re-encoded to efficient H.264, so the MKV file is usually about the same size as your MOV.
  • Pick MKV when you need a file made for archiving with multiple tracks and subtitles.

MOV vs MKV

PropertyMOVMKV
Full nameQuickTime MovieMatroska Video
ContainerQuickTimeMatroska
Typical codecH.264 / ProResH.264 / H.265
CompatibilityModern playersLimited
Relative sizeMediumMedium
Best forEditing, especially on Apple devicesArchiving with multiple tracks and subtitles

How to convert MOV to MKV

  1. Add your MOV file

    Drag and drop your .mov file onto the upload area, or click to browse and pick it from your device.

  2. Start the conversion

    Click "Convert to MKV". Everything runs locally with ffmpeg compiled to WebAssembly (ffmpeg.wasm) - your file stays on your device.

  3. Wait a few seconds

    A progress bar shows the conversion. The first run is slightly slower while the engine loads, then it is cached.

  4. Download your MKV file

    When it finishes, download the .mkv file straight to your device.

Frequently asked questions

Is this MOV to MKV converter free?
Yes. It is completely free with no signup, no watermark, and no limit on how many files you convert. It is supported by ads, which keeps the conversion itself free.
Are my files uploaded to a server?
No. The conversion runs locally in your browser using ffmpeg compiled to WebAssembly (ffmpeg.wasm), so your file is processed in memory on your own device and is never uploaded, stored, or seen by anyone.
Will I lose quality converting MOV to MKV?
The video is re-encoded to MKV with a high-quality setting, so the result looks very close to the original MOV. Re-encoding is never bit-for-bit identical, but the loss is minimal.
Will the file get smaller or larger?
Usually similar. The video is re-encoded to H.264 at a high-quality setting, so the MKV file is typically about the same size as your MOV; the container itself adds little.
What is the difference between MOV and MKV?
MOV is QuickTime Movie (a QuickTime container, typically H.264 / ProRes); MKV is Matroska Video (a Matroska container, typically H.264 / H.265). MKV is best for archiving with multiple tracks and subtitles, while MOV is best for editing, especially on Apple devices.
How long does the conversion take?
Most files finish in a few seconds to under a minute, depending on length and your device. The first conversion is a little slower while the engine downloads and caches, then later runs start instantly.

Related conversions

MP4 → MKVAVI → MKVMOV → MP4MOV → WebMMOV → AVIMOV → MP3

Need more formats or options? Use the full Change Video Format.