MOV to MKV Converter – Free Online

How to Convert MOV to MKV Online

Drop your MOV file

Drag and drop your .mov file onto the box above, or click Choose Files. The request is already filled in: “Convert this to MKV”.

Say how, if you want

The AI assistant uses sensible defaults. To choose the resolution, frame rate or bitrate yourself, say so in the request, for example “Convert this to MKV in 720p”.

Save your MKV file

The assistant opens with your file and converts it on your own device; the file itself is never uploaded. When the MKV file is ready, click Save. Prefer to set everything by hand, or batch-convert several files into a ZIP? The classic converter is one click away on this page.

Why Convert MOV to MKV?

Matroska is the preferred container for Plex, Jellyfin and Kodi libraries because it supports chapters, several subtitle tracks and any codec. Converting MOV to MKV moves your QuickTime footage into that flexible container.

The video is re-encoded with the source codec and bitrate kept by default, so a full-length MOV comes out looking the same; conversion time depends on its length and resolution.

Private by design: your MOV file is converted on your own device and never uploaded.
MKV already asked for: the AI assistant's request says MKV, so one drop does it. Want a particular resolution, frame rate or bitrate? Just say so.
Batch friendly: the classic converter on this page takes several MOV files in one go and downloads them as a ZIP.
Free, no watermark: no sign-up, and nothing stamped on the output.

MOV vs MKV

MOV (QuickTime File Format): MOV is Apple's QuickTime container. iPhones, iPads and Final Cut Pro record and export MOV natively, and it can hold high-quality H.264, HEVC or ProRes streams. It is best for Apple devices, iMovie and Final Cut Pro workflows.

MKV (Matroska Video): MKV (Matroska) is an open container that can hold practically any codec plus multiple audio tracks, subtitle tracks and chapters, which makes it popular for archiving films and TV episodes. It is best for archiving, multi-language releases and media servers.

In short: keep MOV when the priority is Apple devices, iMovie and Final Cut Pro workflows, and switch to MKV when the file is headed for archiving, multi-language releases and media servers. Need a different target? The full Video Converter supports every format listed below.

MOV to MKV FAQ

Is MOV to MKV lossless?

Not bit-for-bit: the video is re-encoded, but with the source codec and bitrate kept the MKV is visually identical to the MOV.

Will Plex play the MKV directly?

Yes. Plex, Jellyfin and Kodi play MKV with H.264/HEVC natively, and most clients direct-play it without transcoding.

Is this MOV to MKV converter free?

Yes. Converting MOV to MKV on MediaConverter.io is free, with no watermark and no sign-up. The AI assistant runs on a free daily allowance of assistant credits; the classic converter on this page has no daily limit at all.

Are my MOV files uploaded to a server?

No. The conversion runs inside your browser using WebCodecs and FFmpeg compiled to WebAssembly, so your .mov file is read and converted on your own device and never uploaded, which keeps private recordings private and means there is no waiting in an upload queue. The AI assistant only sees what you type and basic facts about the file: its name, format, duration and size.

Is there a file size limit for MOV to MKV?

There is no plan or account limit, but the converter loads the whole MOV file into your browser's memory, so about 2 GB per file is the practical ceiling; larger files may fail to open. Long or high-resolution files also take longer, especially on phones.

Can I choose the MKV settings myself?

Yes. Ask the AI assistant for a resolution, frame rate or bitrate in your request. Audio and subtitle track selection, the codec list and every other setting are in the classic converter, one click away on this page.

Will converting MOV to MKV reduce quality?

The video is re-encoded into MKV. Keep the source codec, resolution and bitrate (the defaults) and an ordinary 8-bit video is visually the same as your MOV, while a 10-bit, HDR or full-color (4:2:2 or 4:4:4) source can lose some color detail. Lowering the bitrate or resolution is what reduces quality, and you control that trade-off by asking for it (or in the classic converter's settings).

Which browsers support the MOV to MKV converter?

It is built and tested on current desktop Chrome and Edge, which are also fastest because they expose hardware-accelerated WebCodecs video decoders. Recent Firefox and Safari releases support the same web APIs; if a file fails there, try Chrome or Edge.