Lossless WebM to MP4 Converter

What it does

Most WebM → MP4 tools still re-encode video even when it isn’t necessary — adding delay, CPU load and potential quality loss; this tool skips that completely and uses FFmpeg stream copy to remux AV1 WebM into MP4 instantly, with no re-encoding, no quality loss and no waiting; built for fast local workflows with drag & drop, batch processing and fully offline usage; supports AV1 only by design.

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