Free MP4 to MKV Converter

MP4 to MKV Converter

Convert MP4 to MKV online for free. Private browser-based video conversion powered by FFmpeg. No upload, no watermark.

Frequently asked questions

Is MP4 to MKV conversion free?

Yes, Convert.AI offers free browser-based video conversion.

Is my file uploaded?

No. Conversion runs locally in your browser using FFmpeg.wasm.

What is the file size limit?

Free users can convert video files up to 200MB.

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