Convert MP4 to WebM
Convert MP4 video to WebM for modern websites, browser playback, web apps, and open web video workflows. Download your converted WebM file online.
Drop your MP4 files here
Up to 250MB per file.
Conversion Settings
Files are encrypted and auto-deleted after conversion
How to Convert
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Upload your MP4 files
Drag and drop or select MP4 files from your device. You can upload multiple files at once.
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Configure Output
Choose the video quality and keep the source dimensions or reduce the output size proportionally.
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Download WebM files
Once conversion finishes, download your files individually or as a compressed ZIP archive.
Why convert MP4 to WebM?
WebM is an open web video format built for browser playback, websites, and web applications.
The MP4 is converted to VP9 video with Opus audio for modern web delivery.
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Frequently Asked Questions
How do I convert MP4 to WebM?
Add your MP4 file, choose the quality and output size, start the conversion, then download the completed WebM file. No account is required.
Can I change the WebM quality and dimensions?
Yes. Use the quality control to balance visual detail and file size. The output size slider can retain the source dimensions or reduce them proportionally.
Will the converted video keep its audio?
Yes. The first audio track is included when the source video contains one. Silent videos remain silent.
Is the conversion secure?
Yes. Files are transferred over an encrypted connection, processed securely, and automatically deleted shortly after conversion.
What are the file and duration limits?
MP4 files can be up to 250MB. Video conversions can be up to 30 minutes.
Why convert MP4 to WebM?
WebM provides a useful combination of playback compatibility, manageable file size, and support across common devices, browsers, editors, and sharing services.