MP4 to MKV Converter

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MP4, WebM, AVI, MPEG, MKV, FLV, OGG, MOV, M4V, WMV, ASF, 3GP and other video files
Max file size: 200MB

All uploaded files are automatically deleted 1 hour after upload.
For permanent links you can use: https://ezgif.com/mp4-to-mkv?url=https://example.com/source-video.mp4

Free Online MP4 to MKV Converter

Convert MP4 video files to Matroska (MKV) format instantly in your browser — no software to install, no registration, and no watermarks. Uploaded files are automatically deleted after one hour.

About MKV (Matroska)

MKV is a flexible, open-standard container format that can hold virtually unlimited video, audio, subtitle, and chapter tracks in a single file. It is the preferred format for media libraries, Plex/Kodi servers, and archival purposes. Unlike MP4, MKV supports soft subtitles (SRT, ASS), multiple audio tracks, and chapter markers natively.

Lossless conversion

This tool copies the video and audio streams directly from the MP4 container into MKV without re-encoding. The result is zero quality loss and near-instant processing. The output file will be approximately the same size as the input.

Frequently asked questions

Is there any quality loss?

No. The streams are remuxed (repackaged) without re-encoding, so every pixel remains identical to the original MP4.

Can I play MKV files on my phone?

Most Android devices play MKV natively. On iPhone, use a third-party player like VLC. MKV is not supported in web browsers, so for web use, stick with MP4 or WebM.

Similar conversions: MP4 to WebM, MP4 to MOV, MKV to MP4.