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WebM to MP4

Make WebM clips play everywhere by re-encoding them to MP4—100 % free and watermark-free.

or drag & drop up to 100 MB here

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How to convert WebM to MP4 online

1. Upload your WebM

1. Upload your WebM

Click “Choose files” or drag the video onto the page. HD and 4K clips up to 100 MB travel over encrypted HTTPS.

2. Pick MP4 settings

2. Pick MP4 settings

MP4 (H.264 + AAC) is pre-selected. In Advanced settings you can trim, resize, or set a target bitrate for smaller emails and LMS uploads.

3. Download the MP4

3. Download the MP4

Press “Convert”. In seconds your new .mp4 is ready—drop it into iMovie, WhatsApp, PowerPoint, or any media player.

FAQ

Why convert WebM to MP4?

MP4 with H.264 is accepted by virtually every device and app, while WebM may fail on older iPhones, Safari, or some TVs. Converting guarantees smooth playback everywhere.

Will the conversion keep the original quality?

Yes. We use a high-profile H.264 encoder with adaptive bitrate to preserve visual detail. For near-lossless results choose a higher bitrate in Advanced settings.

Is the audio track converted too?

Absolutely. Opus or Vorbis from the WebM is transcoded to AAC so the MP4 plays in all media players.

How can I make the MP4 small enough for email attachments?

After uploading, lower the resolution or target bitrate in Advanced settings to create a lighter file—e.g., under 25 MB for Gmail.

Does MP4 support transparency like WebM with alpha?

Standard H.264 MP4 cannot carry an alpha channel. If you need transparency, keep WebM VP9-alpha or export MOV ProRes 4444.

What’s the maximum upload size?

Videos up to 100 MB are supported. Larger projects should be trimmed or compressed locally before upload.

How secure are my files?

All transfers use HTTPS. Files are processed only in volatile memory and are automatically deleted minutes after conversion.

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