webm → mp4 · marry audio · everything stays in your browser
drop files here or click to pick a video (.webm or .mp4) · optionally a song (.mp3 / .wav) to marry in
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First run downloads the ffmpeg engine (~31 MB, cached after). Conversion runs entirely on your machine
— nothing is uploaded. webm → mp4 re-encodes to H.264 (crf 18); an mp4 with a song marries losslessly
(-c:v copy). Made for LT64 / MCT64D renders, works on anything.