Convert MP4 to WebM
Convert MP4 video files to WebM format for web use, entirely in your browser. WebM is an open-source format with excellent browser support, smaller streaming file sizes, and no patent licensing fees. No server upload, no signup, processed with FFmpeg.wasm.
Updated June 2026
- 1Upload your MP4 video
- 2Conversion runs instantly
- 3Download your WebM file
Drop your video anywhere, click to browse
MP4, MOV, WebM, AVI · Any format
How to Use Convert MP4 to WebM
- 1
Upload your MP4 video
Drag and drop your MP4 file into the upload area, or click to browse and select it.
- 2
Conversion runs instantly
ToolBubble converts the video to WebM directly in your browser.
- 3
Download your WebM file
The converted file downloads automatically to your device.
Frequently Asked Questions
Why would I convert MP4 to WebM?▼
Is there any quality loss when converting?▼
Does the converted WebM support transparency?▼
Is the conversion done in the browser?▼
What if I need to convert the other way (WebM to MP4)?▼
How to use Convert MP4 to WebM
- 1
Upload your MP4 video
Drag and drop your MP4 file into the upload area, or click to browse and select it.
- 2
Conversion runs instantly
ToolBubble converts the video to WebM directly in your browser.
- 3
Download your WebM file
The converted file downloads automatically to your device.
Frequently asked questions
Everything you need to know about convert mp4 to webm.
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