Convert WebM to MP4
Free, private WebM to MP4 conversion - processed entirely in your browser, nothing is uploaded.
WebM is what browsers produce - screen recorders, Google Meet, Loom exports, and most JavaScript recording libraries all emit it. It plays fine in Chrome but chokes in video editors, iMessage, iMovie, and on iPhones generally. Converting to MP4 gives you a file every editor and every Apple device accepts. Everything runs locally in your browser; the recording is never uploaded.
Drop a video here
or click to browse. Convert between MP4, WebM, MOV, MKV, and AVI.
Frequently asked questions
Why is my WebM screen recording rejected by video editors?
Most professional editors (Premiere, Final Cut, DaVinci before 18.5) either skip WebM entirely or import it without audio, because it uses VP8/VP9 and Opus codecs they license differently. MP4 with H.264 and AAC imports cleanly everywhere.
My WebM file has no duration or a broken progress bar - will it still convert?
Yes. Recordings from MediaRecorder (Meet, Loom, browser screen capture) often lack a duration header, which confuses players. This converter reads the whole stream, so the output MP4 gets a correct duration and seeks normally.
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Convert Video
All formats - MP4, WebM, MOV, MKV, and AVI