MP4 → WebM
Convert MP4 to web-optimized WebM — private & in-browser
Drop MP4 files here
or click to browse — .mp4, .m4v
Convert MP4 to WebM
smaller files, open format
Transform MP4 videos into open-source WebM format with VP9 compression for smaller files and excellent quality. Everything runs in your browser — no uploads, no signup, completely free.
Powerful features built for speed
Everything you need to convert MP4 to WebM — fast, private, and completely free.
Smaller Files with VP9
WebM with VP9 compression typically produces smaller files than MP4 with H.264 at equivalent visual quality. Save bandwidth and storage without sacrificing video fidelity.
100% Private Processing
All conversion happens in your browser. Your MP4 video files are never uploaded to any server — complete privacy guaranteed, your videos never leave your device.
No Account Required
Skip registration entirely. Open the tool, load your MP4 file, and download the WebM. No email, no password, no tracking, no friction.
Unlimited Conversions
Convert as many MP4 files to WebM as you need. No daily limits, no conversion quotas, no waiting. Process entire video libraries without restrictions.
Open-Source Format
WebM is a royalty-free, open-source video format developed by Google. No licensing fees, no patent restrictions — perfect for developers and open-source projects.
Web-Optimized Output
WebM is designed specifically for web video. It streams efficiently, loads fast, and is supported by Chrome, Firefox, Opera, and Edge natively.
Why choose our MP4 to WebM converter
Real advantages that make a difference in your daily workflow.
Reduced Bandwidth Costs
WebM VP9 compression can reduce video file sizes by 30–50% compared to H.264 MP4. Significant savings for video-heavy websites and streaming platforms.
Royalty-Free Format
Unlike H.264 which has patent licensing requirements, WebM with VP8/VP9 is completely royalty-free. No licensing fees for developers, content creators, or distributors.
Faster Web Loading
WebM is optimized for HTML5 web video. Smaller file sizes mean faster page loads, reduced buffering, and better user experience for web video content.
Ideal for Web Games
WebM is widely used in web-based games and interactive applications. Convert your MP4 cutscenes and animations to WebM for efficient web delivery.
Who uses this MP4 to WebM tool
From professionals to everyday users — see how MP4 to WebM conversion fits your needs.
Web Developers
Convert MP4 video assets to WebM for HTML5 web video. Use the <picture> element to serve WebM with MP4 fallback for cross-browser compatibility.
Open-Source Projects
Keep video assets patent-free by converting MP4 to WebM. Perfect for open-source software, Linux distributions, and community-driven projects.
Content Platforms
Serve WebM video to reduce bandwidth costs and improve loading times. Many platforms including YouTube use WebM internally for its efficiency.
Game Developers
Convert MP4 cutscenes and animations to WebM for web-based games. WebM is supported by HTML5 game engines and offers efficient streaming.
Convert in 4 simple steps
No complicated settings. No technical knowledge required. Just follow these steps.
Select Your MP4 File
Click the upload area or drag and drop your MP4 video file. The tool accepts MP4 files of any resolution and duration.
Choose Quality Settings
Optionally adjust video quality and resolution. Default settings preserve the original quality while converting to WebM format.
Convert in Browser
The MP4-to-WebM conversion happens entirely in your browser. No upload, no server processing — your video stays on your device.
Download Your WebM
Click download to save your converted WebM file. Compare the file size with the original MP4 — WebM is typically smaller.
Get the best conversion results
Follow these expert tips to maximize quality and efficiency when converting MP4 to WebM.
Use VP9 for Best Compression
VP9 offers significantly better compression than VP8. If your browser supports VP9 encoding, use it for the smallest file sizes at equivalent quality.
Provide MP4 Fallback
Not all browsers support WebM (notably older Safari). Use the HTML <video> element with multiple <source> tags to serve WebM first with MP4 fallback.
Compare File Sizes
After conversion, compare the WebM file size with the original MP4. You will typically see 20–50% reduction at equivalent visual quality.
Keep Resolution Consistent
Maintain the original resolution during conversion. Reducing resolution saves space but also degrades visual quality — let the codec handle compression.
Frequently asked questions
Everything you need to know about converting MP4 to WebM.
What is WebM format?
WebM is an open-source, royalty-free video format developed by Google. It uses VP8 or VP9 video codecs and Opus or Vorbis audio codecs. WebM is designed specifically for web video and is supported by Chrome, Firefox, Opera, and Edge.
Is WebM better than MP4?
WebM with VP9 typically produces smaller files than MP4 with H.264 at equivalent quality. However, MP4 has broader device and platform compatibility. For web video, WebM is excellent. For universal sharing, MP4 may be preferable. Use both with HTML5 fallback for best results.
Is the MP4 to WebM converter free?
Yes, completely free with no limits. No signup, no daily caps, no watermarks. Convert as many MP4 files to WebM as you need, anytime. Convertly is supported by ads and optional donations.
Does converting MP4 to WebM lose quality?
Both MP4 and WebM use lossy compression. Converting from one lossy format to another will result in some quality loss. However, at high quality settings, the difference is virtually imperceptible to most viewers.
Is my MP4 file uploaded to a server?
No. The entire conversion happens in your browser. Your MP4 video file is never uploaded, stored, or transmitted to any server. It stays on your device at all times — complete privacy.
Can I batch convert MP4 to WebM?
Yes, you can convert multiple MP4 files to WebM one after another with no limits. Each conversion processes locally in your browser with no upload time.
Which browsers support WebM?
WebM is supported by Chrome, Firefox, Opera, and Edge. Safari has limited WebM support (added in Safari 14.1 for macOS Big Sur and later). For universal web video, provide MP4 fallback using the HTML <video> element.
Does the converter work on mobile?
Yes, the MP4 to WebM converter works on all devices — desktop, laptop, tablet, and mobile phones. The interface is fully responsive and optimized for screens as small as 358px wide.
Still have questions?