Turn your WebM videos into universally compatible MP4 files right in your browser — no uploading to a server. Pick your quality and download. Fast, private, and free.
Drop your WebM video here or click to browse
Select a WebM video file
Drop your WebM video file — from screen recordings, browsers, or any source.
Select high, medium, or low quality depending on your needs — balance file size and clarity.
Get your MP4 instantly — plays on every device, browser, and platform.
WebM is great for the web, but MP4 (H.264) is the most universally supported video format. iPhones, Android phones, TVs, social media platforms, and video editors all handle MP4 natively. Converting ensures your video plays everywhere without compatibility issues.
There is minimal quality loss when converting at the "High" setting (CRF 18). The conversion re-encodes the video using H.264, which is highly efficient. For most videos, the difference is imperceptible. Use "Medium" or "Low" settings for smaller file sizes with a slight quality trade-off.
Since conversion runs entirely in your browser using WebAssembly, the limit depends on your device's available memory. Most modern devices can handle videos up to 500 MB comfortably. For very large files, you may need to use a desktop application.
No. The entire conversion process happens locally in your browser using FFmpeg.wasm. Your video never leaves your device — it is 100% private.
Yes! The converter preserves the audio track from your WebM file. Audio is re-encoded to AAC at 128kbps, which is the standard for MP4 files and ensures broad compatibility.
WebM to MP4 conversion works in all modern browsers that support WebAssembly and SharedArrayBuffer — including Chrome, Edge, Firefox, and Safari 16.4+. For the best performance, use the latest version of Chrome or Edge.
Drop a WebM file and get a universally compatible MP4 in seconds — right in your browser, no sign-up required.