Convert WebM videos to MP4 format in your browser — no upload needed.
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Convert WebM videos to MP4 format for maximum compatibility with all devices and media players.
Upload your WebM file, click Convert, and download the MP4 output. Video is encoded with H.264 and audio with AAC.
Upload your WebM file
Drop a .webm file (common for screen recordings and web downloads) onto the upload zone.
Convert
Click "Convert to MP4". FFmpeg re-encodes the WebM using H.264 for broad device compatibility.
Download
Save the MP4 to play on any device or share on any platform.
iPhone Compatibility
WebM is not supported on iPhones — convert to MP4 to play screen recordings and web downloads on iOS.
Screen Recording Sharing
Browser screen recordings (OBS, Loom) often save as WebM — convert to MP4 for universal sharing.
Social Media Upload
YouTube, Instagram, and TikTok accept MP4 — convert WebM downloads before uploading.
Video Editing Import
Many video editors don't support WebM — convert to MP4 H.264 for smooth import into editing software.
Offline Playback
Windows Media Player and most media players don't support WebM natively — MP4 works everywhere.
Sharing & Attachments
MP4 is more universally accepted in messaging apps and email clients than WebM format.
H.264 + AAC Output
Converts VP8/VP9 WebM to H.264 MP4 — the most compatible format for devices worldwide.
100% Browser-Based
FFmpeg WebAssembly runs locally — your WebM files stay private on your device.
Fast Start Enabled
-movflags +faststart ensures the MP4 output begins streaming immediately without waiting for full download.
No File Size Limits
No server means no upload caps — convert large WebM screen recordings without restrictions.
Handles VP8 & VP9
Converts both VP8 and VP9 WebM video streams to H.264 for maximum output compatibility.
Free — No Watermarks
No watermarks on output. Use free for files up to 40 MB, sign up free to raise your limit to 80 MB, or upgrade to Pro for 250 MB per file.
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All processing happens directly in your browser. Your documents are never sent to any server — complete privacy guaranteed for users in the USA, Canada, UK, and worldwide.
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Whether you are on a Mac, Windows PC, iPhone, or Android in New York, Toronto, London, or Sydney — our tools work instantly in any modern browser.
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