WebM to MP4
Make any WebM clip play everywhere by re-encoding it to MP4 in seconds - free, unlimited and right in your browser.
or drag and drop your file
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How to convert WebM to MP4
Get a device-friendly MP4 in three quick steps
1. Upload your WebM
Click “Upload” or drag a video onto the page. We handle HD and 4 K files up to 2 GB over encrypted HTTPS.
2. Choose MP4 settings
MP4 (H.264 + AAC) is pre-selected. In “Advanced settings” you can trim, resize or pick a constant bitrate for smaller files.
3. Download the MP4
Press “Convert”. Your .mp4 is ready in seconds - drop it into iMovie, WhatsApp, PowerPoint or any media player.
Universal playback
H.264 MP4 plays natively on iOS, Android, Windows, macOS, Smart-TVs, game consoles and nearly every browser.
Smaller files, same quality
Our encoder balances bitrate and resolution to keep quality high while shrinking file size - perfect for email, LMS or CMS uploads.
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WebM to MP4
Transform WebM videos to universal MP4 for smooth playback on any device: drag, convert and save quickly.
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FAQ
Why convert WebM to MP4?
MP4 with H.264 is accepted by virtually all devices and apps, while WebM may fail on older iPhones, Safari or some TVs. Converting ensures smooth playback everywhere.
Does the conversion keep the original quality?
We use a smart VBR H.264 encoder that preserves visual detail. For near-lossless results choose a higher bitrate in “Advanced settings”.
Will the audio track be converted too?
Yes. Opus or Vorbis audio from the WebM is transcoded to AAC so the MP4 plays in every media player.
Can I make the MP4 smaller for email attachments?
Absolutely. After uploading, lower the resolution or bitrate in Advanced settings to generate a lighter file under common email limits (e.g., 25 MB).
Does MP4 support transparency like WebM with alpha?
Standard H.264 MP4 does not carry an alpha channel. If you need transparency keep the file in WebM VP9-alpha or export as MOV ProRes 4444.
What is the maximum upload size?
You can upload videos up to 2 GB. Larger projects should be trimmed or compressed locally before conversion.
How secure are my files?
All transfers go through HTTPS, processed in RAM only and auto-deleted within minutes of conversion - no permanent storage.