No — conversion happens locally in your browser.

MKV to MP4

Convert MKV videos to universally-compatible MP4.

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About MKV to MP4

Turn MKV files into MP4 (H.264) that plays on virtually any device or platform. Runs entirely in your browser — no uploads.

Open the MKV to MP4 tool and add your file — it's processed in your browser, never uploaded.
Adjust the available options to get the result you want.
Download the result. There's no sign-up, no watermark, and no size cap.

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