MP4 to WebM
Shrink MP4 videos into modern, royalty-free WebM in seconds - perfect for websites, apps and email embeds.
or drag and drop your file
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How to convert MP4 to WebM
Create a WebM file in three quick steps
1. Upload your MP4
Click “Upload” or drag a video onto the page. HD and 4K clips up to 2 GB are processed securely over HTTPS.
2. Pick WebM settings
WebM is pre-selected. Choose VP9 for better quality at smaller sizes or VP8 for maximum browser support. Adjust resolution or bitrate in “Advanced settings”.
3. Download the WebM
Press “Convert”. Your optimized .webm file is ready in seconds - embed it with the HTML5 <video> tag or share it anywhere.
Smaller files, faster pages
VP9 compression can cut file size by up to 50 % compared with H.264, lowering bandwidth costs and speeding up page loads.
Royalty-free & future-proof
WebM is backed by Google and works in Chrome, Firefox, Edge, Opera, Android and more - no patent fees or plug-ins required.
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FAQ
Why convert MP4 to WebM?
WebM offers better compression, is royalty-free and plays natively in all modern browsers without extra codecs - ideal for web developers and CMS platforms.
Which codec should I choose, VP8 or VP9?
VP9 delivers higher quality at lower bitrates but requires newer browsers (Chrome 29+, Firefox 28+). VP8 is slightly larger but supports some older devices.
Can WebM contain transparent video?
Yes. VP9 supports an alpha channel. Enable “Transparency” in Advanced settings to export WebM with a clear background for overlays.
Will converting lower my video quality?
Quality depends on bitrate. Keep the default auto-bitrate for a balanced result or raise it in Advanced settings for near-lossless output.
Does WebM play on Safari or iOS?
Safari on macOS 11+ supports VP9 WebM. Older Safari and iOS browsers need an MP4 fallback, so consider serving both formats with the HTML5 <source> tag.
What is the maximum file size I can upload?
Up to 2 GB per file. Larger projects should be trimmed or down-scaled before upload.
How are my files kept private?
All transfers use encrypted HTTPS. Files are processed in volatile memory and automatically deleted within minutes of conversion.