Convert a WebM file to MP4
When to re-encode and when to just change the container, and which settings keep the file playable everywhere.
01Add the file
Open Converter, click Select files and pick the WebM file, or drop it onto the Converter. Several files at once is fine, they all take the same settings.
02Choose MP4 as the output format
Pick MP4 in the format step. ClipHearth writes 11 video formats in total, so the same steps work for MKV, MOV, AVI, and the rest.
03Decide: re-encode or just repackage
WebM usually holds VP9 video and Opus audio. Leaving VIDEO CODEC on Auto or picking H.264 / AVC re-encodes the picture, which takes longer but plays on anything. Setting VIDEO CODEC to Copy original only changes the container: it is quick and loses no quality, but the file keeps VP9 inside, which older players and some devices refuse.
04Set the audio to AAC
If you copy the video stream, set AUDIO CODEC to AAC. Most players expect AAC in an MP4 and stay silent on an Opus track. Re-encoding the sound of a short clip costs a second or two.
05Pick a quality profile
Balanced suits most files. Small file trades detail for size, High quality does the opposite. When you know what you are doing, the advanced settings expose CRF, VIDEO KBPS, FPS, and a resize field that keeps the original size when left blank.
06Start the conversion
Start conversion queues the job and OUTPUT shows where the MP4 will land. The WebM file stays where it is, untouched, so you can compare the two and delete the one you do not need.
Didn't solve it? Write to us - attach a diagnostics log if you have one. Missing a feature? Tell us what you would use it for; several of the recent ones started as a suggestion.