Convert MOV to MKV
Last updated: June 1, 2026To convert MOV to MKV, drop your MOV file into the converter above, then download the MKV result. It's free, needs no sign-up, and there's no watermark. Conversion runs in your browser with on-device FFmpeg, so your files never leave your device.
Why convert MOV to MKV?
Rewrap your QuickTime MOV inside a Matroska MKV right in your browser. Because MOV and MKV are both containers, our FFmpeg WebAssembly tool can copy the existing H.264/H.265 video and AAC audio straight across with no re-encoding, so the result is pixel-for-pixel lossless and fast. MKV's open format then unlocks bundled subtitle tracks, multiple audio streams, and chapters that MOV handles awkwardly. Nothing uploads: your file never leaves your device. Free, no sign-up, no watermark.
- Building a clean archive or media-server library (Plex, Jellyfin, Kodi) where one MKV can hold the video, several audio languages, soft subtitles, and chapter markers that a MOV can't carry together.
- Playing iPhone or Mac QuickTime recordings on Windows, Android, or Linux players like VLC and MPC-HC that treat MKV as a first-class format without Apple codecs.
- Muxing in external SRT/ASS subtitle and extra audio tracks for a release or fan-sub, since Matroska supports unlimited soft subs and audio streams while MOV does not.
MOV vs MKV
MOV · QuickTime Movie
MOV is Apple's QuickTime container, the format iPhones and Macs record in. It's high quality but less portable than MP4 on Windows and Android.
MKV · Matroska Video
MKV (Matroska) is a flexible open container that can hold many video, audio and subtitle tracks in one file. It's popular for archiving, but doesn't play natively in many browsers or on some TVs.
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Open Video ConverterMOV to MKV — frequently asked questions
Will converting MOV to MKV reduce the quality?
No. MKV accepts the same H.264, H.265, and AAC streams most MOV files already use, so the tool remuxes by copying them into the new container rather than re-encoding. The picture and sound are bit-for-bit identical to the source, and the process is near-instant because nothing is compressed again.
Is my video uploaded to a server?
Never. The entire conversion runs locally in your browser using FFmpeg compiled to WebAssembly. Your MOV is read and rewrapped on your own device, so even large or private recordings stay completely off the internet. That also means it keeps working offline once the page has loaded.
Will the MKV file be larger than my MOV?
It is usually about the same size, give or take a small amount of container overhead, because the underlying audio and video data is unchanged. MKV stores stream data efficiently, so any difference comes from the wrapper and any extra subtitle or audio tracks you add, not from the video itself.
How do I convert MOV to MKV?
Drop your MOV file (or several) into the converter, confirm MKV is selected as the output, click convert, then download the MKV file. The whole thing takes a few seconds.
Is this MOV to MKV converter free?
Yes — it's completely free with no watermark and no sign-up required.
Is it safe to convert MOV to MKV here?
Yes. Conversion runs on-device with FFmpeg compiled to WebAssembly, so your MOV file is never uploaded to a server.
Can I convert multiple MOV files at once?
Convert one MOV file at a time — finish one, then drop in the next.
Does it work on mobile?
Yes — the converter runs in any modern browser on phones, tablets and desktops.