Audio & video converter
Convert WebM to MP4 online for free
Convert WebM files to MP4 securely in your browser. No upload, no account and no watermark.
Drop your file here
or choose a file from your device
Input: WebM · Output: MP4
About this WebM to MP4 conversion
What to select
Select a WebM video, including VP8, VP9 or AV1 sources supported by your browser, to produce a compatible H.264/AAC MP4 locally.
What you receive
Your MP4 export is encoded locally after the browser loads the media engine.
Private processing
ConvertME runs this conversion in the browser on your device. Selected files are not transferred to a processing server, and downloads are created locally after conversion.
Format details
- Input
- WebM
- Output
- MP4
- Processing
- In browser
- Cost
- Free
How it works
Convert WebM in three steps
Choose a converter
Pick the exact input and output format you need.
Drop your file
Select a local file. Nothing is uploaded to our servers.
Download the result
Conversion finishes in your browser and exports locally.
FAQ
WebM to MP4 questions
How do I convert WebM to MP4?
Choose a WebM file, select Convert now and download the resulting MP4 file. Processing happens in your browser.
Is this WebM to MP4 converter private?
Yes. Your selected file is processed locally and is not uploaded to ConvertME.
Do I need an account to convert WebM files?
No. The converter is free to use without sign-up or watermarks.
What will my MP4 download contain?
Your MP4 export is encoded locally after the browser loads the media engine.