Free MP4 to WebM Converter Online
Convert MP4 to WebM online — smaller file sizes for faster websites. No ffmpeg, no software to install.
Works on Mac, Windows, Linux, iPhone, and Android — no download or install required.
Drag a MP4 file here or click to select
File should not exceed 1GB
How to Use This Tool
1
Drag and drop your MP4 file onto the upload area, or click to browse your files
2
Click "Convert to WebM" to start the conversion
3
Wait a few seconds while our servers encode the file
4
Click "Download" to save your converted WebM file
What is MP4?
MP4 (MPEG-4 Part 14) is the most widely used video container in the world, typically containing H.264 video and AAC audio. It is the standard output for cameras, phones, and video editors, and works on every device. MP4 is ideal for sharing and playback, but its file sizes can be larger than necessary for web streaming — which is where WebM has the edge.
What is WebM?
WebM is an open, royalty-free video format developed by Google in 2010, built specifically for web delivery. It uses VP8 or VP9 video with Opus audio, and produces files that are typically 20–40% smaller than equivalent H.264 MP4 at the same quality. WebM is natively supported in Chrome, Firefox, and Edge, and is the format of choice for HTML5 video embeds and web-optimized delivery.
See It In Action
Why Convert MP4 to WebM?
If you're embedding video on a website, WebM gives you meaningfully smaller files than MP4 — which means faster page loads, lower bandwidth costs, and better Core Web Vitals scores. VP8 and VP9 encoding (used in WebM) can match H.264 quality at 20–40% smaller file sizes. Web developers typically serve WebM as the primary source in an HTML5 `<video>` tag with MP4 as the Safari fallback. Converting with ffmpeg works but requires command-line knowledge. Our online converter handles the encoding in your browser — no software to install, no ffmpeg flags to memorize. Upload your MP4 and download an optimized WebM file ready to drop into your site.
Key Features
Smaller Files for Faster Websites
VP8 encoding produces files 20–40% smaller than MP4 at equivalent quality — ideal for web embeds
No ffmpeg or Software Needed
Runs entirely in your browser — no command line, no installs, no ffmpeg flags to remember
No Account for Files up to 1GB
Convert immediately without creating an account or entering your email
Chrome, Firefox & Edge Compatible
Output WebM plays natively in all modern browsers except Safari
Secure & Private
Files are transferred over SSL and automatically deleted from our servers after download
No Watermarks
Your converted WebM is completely clean — no branding or logos added
Perfect For
HTML5 Video Embeds
Web Performance Optimization
Reducing Bandwidth Costs
Landing Page Videos
Background Videos
Replacing ffmpeg for Simple Conversions
Core Web Vitals Improvement
Free Usage Limits
Free (No Account)
1GB
max file size
3
conversions per day
3GB
bandwidth per day
14-Day Free Trial
5GB
max file size
5
conversions per day
25GB
bandwidth per day
14-day trial · cancel anytime
Frequently Asked Questions
Take Your Videos Further
Need more than just conversion? With vitelnk, you can embed your processed video on any website, add password protection, expiring links, viewer registration, and analytics.
14-day free trial · cancel anytime.
Privacy & Security
Your files are processed securely with SSL encryption and automatically deleted after download. We never store or share your files. All processing happens on our secure servers.