MP4 to MKV

Transcode MP4 files to MKV container.

Instant processingNo upload limitsFiles never stored

Upload

Your file stays in memory and is removed after download.

or drag & drop one file here

Step 2: Convert

Ready

Convert MP4 to MKV quickly with this free online converter. MKV is a flexible and modern video container that supports higher video quality, multiple audio tracks, subtitles, chapters, and advanced encoding options—making it ideal for streaming, editing, and long-term video storage.

Your MP4 files are processed locally in your browser, ensuring maximum privacy with no uploads or storage. This tool offers fast performance, fully responsive layout, and high-quality MKV output suitable for modern media players and devices.

Frequently Asked Questions

Is this MP4 to MKV converter free?

Yes. This MP4 to MKV converter is completely free and requires no account.

Why convert MP4 to MKV?

MKV supports higher quality video, multiple audio tracks, embedded subtitles, and more modern codecs.

Do my files get uploaded to a server?

No. Conversions run directly in your browser, so your MP4 file never leaves your device.

Related Tools