Should I use WebM or MP4 for my website?

For best results, use both: serve WebM to Chrome/Firefox/Android (smaller files, faster loading) and MP4 to Safari/iOS (compatibility). Most websites use the HTML5 element with multiple sources, letting each browser pick its best format. This gives you WebM's file size savings while maintaining universal compatibility.

Can I upload WebM to YouTube or social media?

Most platforms accept WebM uploads (YouTube, Vimeo, Facebook), but they may re-encode it to their preferred format anyway. For social media, stick with MP4—it's the most widely supported format across all platforms and devices. WebM shines for videos you host yourself on websites.

Video to WebM Converter - For Chrome, Firefox & Web

Convert videos to WebM for browsers and websites. Smaller files than MP4. Works on Chrome, Firefox, Edge, Android. Free, private, browser-based.

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MP4, MOV, AVI, MKV, and more

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All processing happens in your browser using FFmpeg WebAssembly. Your videos never leave your device—completely private and secure.

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Frequently Asked Questions

WebM is a modern video format designed for the web. It creates significantly smaller files than MP4 (often 20-40% smaller) while maintaining excellent quality. Use WebM for website videos, background videos, and web streaming where file size matters. It's perfect for reducing bandwidth costs and speeding up page loads.

WebM works in Chrome, Firefox, Edge, Opera, and modern Android devices. However, Safari on iPhone and iPad does NOT support WebM—these devices need MP4 instead. For maximum compatibility on websites, provide both WebM (smaller file) and MP4 (fallback for iOS) using the HTML5 video element.

WebM typically produces files 20-40% smaller than MP4 at similar quality levels. For example, a 10MB MP4 video might become a 6-7MB WebM file. This makes WebM ideal for websites where bandwidth and loading speed matter. The tradeoff is that WebM encoding takes longer than MP4.

For most web videos, 'High Quality' works perfectly—great quality with reasonable file sizes. Choose 'Best Quality' for important hero videos or when visual quality is critical. 'Smaller File' is ideal for background videos or autoplay content. 'Smallest File' works for video previews or thumbnails.

Browser-based conversion has strict memory limits, and WebM encoding uses significantly more memory than MP4. We limit output to 480p to ensure the tool works reliably on all devices without crashing. For higher resolutions, use desktop software like HandBrake or VLC.

For best results, use both: serve WebM to Chrome/Firefox/Android (smaller files, faster loading) and MP4 to Safari/iOS (compatibility). Most websites use the HTML5

WebM encoding is slower than MP4 because VP9 is more complex. A 1-minute video typically takes 5-15 minutes on a desktop computer, longer on phones or older laptops. Higher quality settings increase processing time. For frequent conversions or large files, desktop software will be much faster.

No. All processing happens entirely in your browser using FFmpeg WebAssembly. Your video files never leave your device, making this tool completely private and secure. You can even use it offline after the page loads.

The tool outputs at 480p maximum due to browser memory constraints—this is ideal for web use where smaller files load faster. If your source is higher resolution, it will be automatically scaled down. For full HD or 4K WebM files, use desktop software like HandBrake.

Video to WebM Converter - For Chrome, Firefox & Web

Select Video

Quality

Resolution (max 480p)

Conversion Complete

Privacy

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