Free MP4 to WebM
Converter Online
Convert MP4 to WebM online free. Create smaller, web-optimized WebM videos for HTML5 embedding, web development, and Google's open video format — no upload, 100% private.
Upload Your Video
Drag and drop or click to browse
or drag & drop video files here
Supports MP4, WebM, MOV, AVI
Video Conversions
Countries Served
Browser Privacy
Forever Free
100% Private MP4 to WebM Conversion
Convert MP4 to WebM entirely in your browser using FFmpeg.wasm. Your video files are never uploaded to any server — complete privacy for personal videos, client content, and sensitive recordings.
Smaller File Size for Web
WebM with VP9 encoding delivers significantly smaller file sizes than MP4 at equivalent visual quality. Convert your MP4 videos to WebM to reduce bandwidth costs and improve page load times.
Perfect for HTML5 Video & Web Embedding
WebM is natively supported in all modern browsers (Chrome, Firefox, Edge, Opera) and is the preferred format for the HTML5 <video> tag. Convert MP4 to WebM for seamless web integration.
VP9 Encoding for Maximum Efficiency
Our MP4 to WebM converter re-encodes your H.264 MP4 to VP9 WebM — Google's open video codec that offers 30–50% better compression than H.264 at the same visual quality.
How to Convert MP4 to WebM Online Free
Convert your MP4 video to WebM in 3 simple steps
Upload Your MP4 File
Select your MP4 file from your computer, phone, or tablet. Our free online MP4 to WebM converter handles any MP4 — downloaded videos, screen recordings, exports, and more.
Select WebM as Output
WebM is automatically selected as the output format. The converter will encode your MP4 to VP9 WebM, optimized for web playback and smaller file size.
Convert MP4 to WebM & Download
Click convert and download your WebM file instantly. The entire MP4 to WebM conversion runs in your browser — completely free, no upload, 100% private.
Best Free MP4 to WebM Converter Online
Unlike other online converters that upload your MP4 files to remote servers, our MP4 to WebM converter processes everything locally in your browser with FFmpeg.wasm. Get complete privacy, no file size limits, and no registration required.
VP9 WebM files are smaller and stream faster than MP4 in browsers.
MP4 files stay on your device — zero server exposure.
| Feature | Our Tool | Others |
|---|---|---|
| 100% Browser-based (No Upload) | ||
| Fast MP4 to WebM Conversion | ||
| Unlimited MP4 File Size | ||
| Forever Free MP4 to WebM Converter | ||
| No Software Installation Required | ||
| High-quality VP9 WebM Output | ||
| WebM, MP4, MOV Output Supported |
MP4 to Video Format Support
Convert MP4 and other video formats to WebM, MOV, and more
Input Video Formats
Output Video Formats
MP4 to WebM Converter Reviews
Trusted by web developers, content creators, and engineers worldwide
Frontend Developer
"I use WebM for HTML5 background videos to keep page load times fast. This converter turns my MP4 clips into smaller WebM files instantly, right in my browser. Perfect tool."
Web Designer
"My client's landing page needed a WebM video for the hero section. Converting the MP4 in the browser was instant — no upload, no privacy concerns. The file size was 40% smaller."
Video Production Manager
"We deliver content in both MP4 and WebM for maximum browser compatibility. This browser-based converter makes generating WebM versions of our MP4 master files effortless."
Frontend Developer
"I use WebM for HTML5 background videos to keep page load times fast. This converter turns my MP4 clips into smaller WebM files instantly, right in my browser. Perfect tool."
Web Designer
"My client's landing page needed a WebM video for the hero section. Converting the MP4 in the browser was instant — no upload, no privacy concerns. The file size was 40% smaller."
Video Production Manager
"We deliver content in both MP4 and WebM for maximum browser compatibility. This browser-based converter makes generating WebM versions of our MP4 master files effortless."
Frontend Developer
"I use WebM for HTML5 background videos to keep page load times fast. This converter turns my MP4 clips into smaller WebM files instantly, right in my browser. Perfect tool."
Web Designer
"My client's landing page needed a WebM video for the hero section. Converting the MP4 in the browser was instant — no upload, no privacy concerns. The file size was 40% smaller."
Video Production Manager
"We deliver content in both MP4 and WebM for maximum browser compatibility. This browser-based converter makes generating WebM versions of our MP4 master files effortless."
Frontend Developer
"I use WebM for HTML5 background videos to keep page load times fast. This converter turns my MP4 clips into smaller WebM files instantly, right in my browser. Perfect tool."
Web Designer
"My client's landing page needed a WebM video for the hero section. Converting the MP4 in the browser was instant — no upload, no privacy concerns. The file size was 40% smaller."
Video Production Manager
"We deliver content in both MP4 and WebM for maximum browser compatibility. This browser-based converter makes generating WebM versions of our MP4 master files effortless."
Indie Game Developer
"WebM is the standard for web game cutscenes. Converting my MP4 trailers to WebM for my web-based game is now a one-click process. Smaller files, better performance."
Digital Marketer
"Our landing page videos were slowing down the site. Converting from MP4 to WebM cut the video file sizes in half. This tool made it easy — no server upload, completely private."
Developer
"FFmpeg.wasm in the browser for MP4 to WebM conversion is exactly what privacy-conscious developers need. No server, no upload, zero data exposure. Highly recommended."
Indie Game Developer
"WebM is the standard for web game cutscenes. Converting my MP4 trailers to WebM for my web-based game is now a one-click process. Smaller files, better performance."
Digital Marketer
"Our landing page videos were slowing down the site. Converting from MP4 to WebM cut the video file sizes in half. This tool made it easy — no server upload, completely private."
Developer
"FFmpeg.wasm in the browser for MP4 to WebM conversion is exactly what privacy-conscious developers need. No server, no upload, zero data exposure. Highly recommended."
Indie Game Developer
"WebM is the standard for web game cutscenes. Converting my MP4 trailers to WebM for my web-based game is now a one-click process. Smaller files, better performance."
Digital Marketer
"Our landing page videos were slowing down the site. Converting from MP4 to WebM cut the video file sizes in half. This tool made it easy — no server upload, completely private."
Developer
"FFmpeg.wasm in the browser for MP4 to WebM conversion is exactly what privacy-conscious developers need. No server, no upload, zero data exposure. Highly recommended."
Indie Game Developer
"WebM is the standard for web game cutscenes. Converting my MP4 trailers to WebM for my web-based game is now a one-click process. Smaller files, better performance."
Digital Marketer
"Our landing page videos were slowing down the site. Converting from MP4 to WebM cut the video file sizes in half. This tool made it easy — no server upload, completely private."
Developer
"FFmpeg.wasm in the browser for MP4 to WebM conversion is exactly what privacy-conscious developers need. No server, no upload, zero data exposure. Highly recommended."
Free MP4 to WebM Converter Online — Convert Video for Web
Need to convert MP4 to WebM online free? Our browser-based MP4 to WebM converter encodes your videos to Google's open format instantly — no upload required. Whether you're a web developer embedding HTML5 video or a creator optimizing for web, convert MP4 to WebM for smaller file sizes and native browser support.
