Convert MP4 to WebM for Web-Optimized Video
WebM is the web's native video format — royalty-free, lightweight, and designed specifically for HTML5 video players. Converting your MP4 to WebM with VP9 encoding delivers smaller file sizes at comparable quality, which means faster page loads and lower bandwidth costs for your website.
Not sure which format to use? Our video converter supports every major format. After creating your WebM, consider adding AI-generated subtitles in VTT format for accessible web video playback.
How to Convert MP4 to WebM
Upload Your MP4 File
Drag and drop your MP4 file — up to 2,000 MB without an account, 2 GB with a free account, 2 GB on Pro (2 GB on Studio). We accept all MP4 variants including H.264, H.265, and MPEG-4 encoded files.
VP9 Encoding for the Web
Our server encodes your video using the VP9 codec inside a WebM container. VP9 delivers excellent quality at lower bitrates than H.264, making it ideal for web embedding. The process takes 1-3 minutes depending on file length.
Download Your WebM File
Embed the WebM directly in your website using the HTML5 video tag. For maximum browser compatibility, keep your MP4 as a fallback. Need subtitles on your web video? Generate VTT captions with our AI tool.
Why Convert MP4 to WebM?
Web Optimized
WebM is designed for the web. Smaller files that stream faster in HTML5 players.
Open Format
WebM is royalty-free. No licensing costs for web deployment.
VP9 Encoding
Modern VP9 codec delivers excellent quality at lower bitrates.
HTML5 Ready
Drop the WebM file directly into your website's video player.
OPTIMIZED FOR THE WEB
Website Background Videos
Background videos on landing pages must load fast. WebM files are significantly smaller than MP4 at the same quality, reducing page load times. Use our compressor on the source MP4 first, then convert to WebM for the smallest possible file.
E-Learning Platforms
Online courses stream hundreds of hours of video. WebM's efficient VP9 encoding reduces bandwidth costs while maintaining clarity for educational content. Add AI subtitles in VTT format for accessible learning.
Open-Source and Royalty-Free Projects
WebM is completely royalty-free, making it the ideal choice for open-source projects, public domain content, and platforms that want to avoid codec licensing fees. Use alongside our converter for any other format needs.
Related Tools
MP4 to WebM — FAQ
Why convert MP4 to WebM?
WebM offers smaller file sizes for web embedding and is royalty-free, making it ideal for websites and web applications.
Is WebM supported by all browsers?
Chrome, Firefox, Edge, and Opera support WebM. Safari has limited support — keep an MP4 fallback for full compatibility.
Will the quality be as good?
VP9 encoding provides comparable quality to H.264 at lower bitrates. Great for web use.
What's the maximum file size?
Files can reach 2 GB.
Can I use this for my website?
Absolutely! WebM is the ideal format for HTML5 video embedding. Use it with the
How long does conversion take?
VP9 encoding takes slightly longer — typically 1-3 minutes depending on video length.
Should I use WebM or MP4 for my website?
Ideally both. Serve WebM as the primary source for Chrome, Firefox, and Edge, with MP4 as a fallback for Safari. This gives you the smallest files for the majority of visitors while maintaining universal compatibility.
Is VP9 better than H.264?
VP9 achieves similar quality at 20-30% lower bitrates than H.264, making it superior for web delivery. However, H.264 MP4 has broader device support. Our converter handles both directions.
Can I add subtitles to WebM files?
Yes! Generate VTT subtitle files with our AI subtitle tool and reference them in your HTML5 video tag with the track element. Or convert existing SRT files to VTT format.
Convert your MP4 to WebM now
Optimized for web. Free.
No credit card required
WebM: Lighter, Faster, Royalty-Free
Give your website the performance boost it deserves. Klipa's MP4 to WebM converter delivers VP9-encoded video files that stream faster and cost less bandwidth — all royalty-free. Combine it with our compressor, AI subtitles, and subtitle converter for a complete web video toolkit.
