Convert WebM video to MP4.
or drop it here · WebM (and most other video formats) · up to 500 MB · WEBM files
Processed in your browser. Files are never uploaded.
Files stay on your device. The first run downloads the processing engine once (about 30 MB).
Drop the WebM file onto the tool or click to browse. It opens locally; nothing is uploaded.
Keep “Automatic” to copy compatible streams losslessly, or choose “Re-encode” for the widest playback support.
Press Convert, watch the progress bar, preview the MP4 and download it.
WebM is a web-first format. Older iPhones, PowerPoint, Keynote and many video editors work better with MP4 and H.264.
Browser screen recorders, Loom-style tools, Discord clips and many web downloads produce WebM files.
If the video inside is already H.264 or HEVC, the tool changes only the container, which takes seconds and keeps every pixel.
The conversion uses ffmpeg compiled to WebAssembly and runs in your tab. Close the page and nothing remains.
Embed a converted MP4 in PowerPoint or Keynote without codec warnings.
Make browser recordings playable in any editor or video player.
Some platforms reject WebM. An MP4 uploads without trouble.
Create new footage, plan your story or improve your source.
Drop the WebM file in, press Convert and download the MP4. The video is re-encoded to H.264 on your device.
WebM video is VP8, VP9 or AV1, which MP4 players rarely support, so every frame must be re-encoded rather than copied.
Yes. Opus or Vorbis audio is converted to AAC so the MP4 plays everywhere.
No. The tool runs inside your browser tab with WebAssembly. Your file is read from your device, processed in memory and offered back as a download. EveryGen never receives a copy of it.
Yes. Because the work happens on your own device, there is no processing cost for us to pass on. You do not need to sign in, nothing is added to your file and there is no daily limit.
Files up to 500 MB are accepted. Above about 200 MB the tool warns you first, because browser memory is limited and long, high-resolution videos take longer to process. A desktop browser handles large files better than a phone.
