Convert MP4 to WebM Video Online Free
Transcode MP4 videos into open WebM format for modern web embedding and HTML5 video playback.
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Your Privacy is Protected
- Your files are processed entirely in your browser
- No file upload — your video never leaves your device
- No account or registration required
- Files are not stored on any server
Convert MP4 to WebM Video Online Free
WebM delivers superior compression efficiency for website backgrounds, transparent videos, and web gaming.
FFmpeg WebAssembly encodes modern VP9 video streams directly in client RAM.
How to Use This Tool
- 1
Select your MP4 file
Drop your file onto the upload box or click to browse. The file stays on your device — it is never uploaded to any server.
- 2
Choose conversion options
Customize output settings or quality bitrate if needed. All parameters are pre-configured for optimal results.
- 3
Process in your browser
Click Convert to run the conversion locally using high-performance client-side WebAssembly and modern web APIs.
- 4
Download WebM
Click Download to instantly save your converted WebM file directly to your local storage.
Why MediaConvertKit is Faster & More Private
| Feature | MediaConvertKit | CloudConvert / Zamzar |
|---|---|---|
| File Processing | 100% In-Browser (Local) | Uploaded to Remote Server |
| Privacy & Confidentiality | Guaranteed Zero Exposure | Files Stored Temporarily |
| Upload & Download Wait | Zero (Direct RAM Access) | Minutes (Bandwidth Dependent) |
| Price & Daily Limits | 100% Free & Unlimited | Paid Credits / Queues |
Supported Formats
Input Formats
Output Format
Frequently Asked Questions
- WebM provides smaller file sizes for website video players and is completely open-source.
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