Best for
OBS recordings, browser captures, quick presentation clips, and short local drafts that need MP4 playback.
Private local converter
WEBM to MP4 Converter
Convert OBS and browser recordings without uploading the file.
Choose a WEBM file from your device. The browser loads ffmpeg.wasm only when needed.
Preset guide
Use PowerPoint compatible for slide decks, Social upload for quality, and Small file for compact drafts.
Privacy note
The file stays on your device. Large clips can be slow because your own browser is doing the conversion.
FAQ
WEBM to MP4 notes
Why convert WEBM to MP4?
MP4 is easier to import into presentation tools, editors, phones, and many creator publishing workflows.
Will every WEBM file work?
Most short creator recordings should work. Very large files may fail if the browser runs out of memory.
Is this a server upload?
No. The conversion runs locally in your browser tab.