Convert WebM to MP4
WebM is a web-native video format — common from screen recorders, browser downloads and sites like YouTube — but it won't import into many editors or play in some apps and on older devices. Converting WebM to MP4 gives you a broadly-compatible file you can edit, share and play almost anywhere. The conversion runs in your browser with FFmpeg, so the file is never uploaded.
Drop your WebM below and pick MP4 as the output format.
Drop a video or audio file
or click to choose · MP4, MOV, WebM, MKV, AVI, MP3, WAV, M4A — converted in your browser
Why convert WebM to MP4?
- Import browser and screen-recorder WebM clips into editors that only accept MP4.
- Play WebM downloads on devices and apps that don't support the format.
- MP4 is the safe default for sharing, uploading and archiving video.
- Converted on your device — free, no upload, no watermark.
How to convert WebM to MP4
- 1Drop your .webm file into the converter below (the first run fetches a ~30 MB engine, then caches it).
- 2Choose MP4 as the output format.
- 3Click convert; longer clips take more time because it all runs on-device.
- 4Download the MP4 when it's done.
Frequently asked questions
Why won't my WebM open in my video editor?+
Many editors don't accept WebM's VP8/VP9 video. Converting to MP4 (H.264) gives you a format almost every editor and player understands.
Will I lose quality converting WebM to MP4?+
Re-encoding to MP4 is technically lossy, but at a sensible quality setting the difference is not noticeable for normal viewing.
Why is the first conversion slow to start?+
The tool loads a ~30 MB FFmpeg engine the first time and then caches it. Later conversions skip that step; only the actual encoding takes time, which scales with clip length.
Related conversions
Need more than WebM → MP4?
The full Video & Audio Converter handles batches, resizing and more — all free and in your browser.