No — conversion happens locally in your browser.

WebM to MP4

Convert WebM videos to universally-compatible MP4.

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About WebM to MP4

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

Open the WebM 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.

Other private, in-browser tools you might need.

Convert almost any video to MP4 — private, in your browser.

Shrink video file size while keeping it watchable.

Convert MP4 videos to the open WebM format.

Convert any video to the open WebM (VP9) format.