Convert WebM to MP4 Video Online Free
Transform browser screen recordings and WebM clips into universally playable H.264 MP4 videos.
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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 WebM to MP4 Video Online Free
WebM screen recordings often fail to play in PowerPoint, Premiere, or on Apple devices. Converting to MP4 guarantees universal compatibility.
Transcoded locally via WebAssembly with zero server data transfer.
How to Use This Tool
- 1
Select your WebM 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 MP4
Click Download to instantly save your converted MP4 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
- Yes, H.264 MP4 plays natively across all Apple iOS and macOS devices.
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