Why convert MP4 to MKV?

MKV is an open, flexible container that is popular for desktop libraries and workflows involving multiple streams.

Will MKV improve MP4 quality?

No. Changing the container cannot add missing detail, and re-encoding may introduce slight loss. High Quality minimizes it.

Are MP4 metadata and chapters copied?

The converter exports the primary video and audio into a straightforward MKV and does not promise to preserve every optional metadata track.

Does conversion require an upload?

No. MP4 to MKV conversion runs entirely on your device.

MP4 to MKV Converter

Convert MP4 to MKV locally in your browser. Create a flexible Matroska video file free with no upload or watermark.

Drop your MP4 file here

or click to choose a file

MP4, MOV, AVI, MKV, WebM, WMV, MPG, VOB, TS, FLV, 3GP, HEVC and GIF

Conversion settings

Output format

QualityMaximum resolutionEncoding mode

MKV is a flexible open container popular for archives, desktop playback, and workflows that may later add multiple audio or subtitle tracks. This preset converts the primary MP4 video and audio streams into a Matroska file. The browser tool produces a straightforward H.264/AAC MKV rather than copying every optional MP4 metadata track. Use MP4 for maximum device compatibility and MKV when a flexible desktop-oriented container is the goal. Processing stays local.

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Free Video Converter for MP4, MOV, MKV, WebM and More

Zolkit's Video Converter changes video formats entirely inside your browser. Convert MOV to MP4, MKV to MP4, WebM to MP4, AVI to MP4, MP4 to WebM, video to GIF, and other common combinations without uploading the source to a server. FFmpeg WebAssembly uses your device's processor for private local conversion, while quality, resolution, and encoding controls let you choose between speed and file size.

Local and private

Video bytes stay on your device; conversion runs inside the browser tab with no media upload.

Fast encoding mode

The default fast preset uses more of your browser's available CPU to finish common conversions sooner.

Nine output formats

Export MP4, MOV, AVI, MKV, WebM, WMV, MPG, FLV, or an animated GIF from one converter.

Quality controls

Choose high quality, balanced output, or a smaller file and optionally cap resolution at 1080p, 720p, or 480p.

Preview before saving

Play compatible results or preview an animated GIF before downloading the converted file.

Free without watermarks

Convert videos without an account, subscription, queue, watermark, or server-side file limit.

How to Convert a Video Format

1
Drop a video onto the converter or click the upload area to choose MP4, MOV, AVI, MKV, WebM, WMV, MPG, VOB, TS, FLV, 3GP, HEVC, or GIF.
2
Choose an output format, quality, maximum resolution, and encoding mode. Fast and balanced settings work well for most videos.
3
Select Convert, keep the tab open while your browser processes the file, then preview and download the result.