Compress WebM Video Online

WebM files from browser recordings and screen captures can be large. Compress and convert them to compact MP4 in your browser — no software to install.

WebM and VP8/VP9 compression

WebM typically uses VP8 or VP9 encoding. Converting to H.264 MP4 gives better device compatibility, and using the quality slider you can target any file size.

How to Get Started

Drop your WebM file — Drag and drop your .webm file into the tool.

Choose quality — Start at 65% quality for a balanced result.

Get your MP4 — Download the compressed MP4 when processing is complete.

Key Features

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Browser recording support

Works with WebM files from MediaRecorder, OBS, and browser screen recorders.

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Convert to MP4

Output is always MP4 H.264, compatible with all platforms.

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Size reduction

WebM to optimized H.264 MP4 typically saves 40–70% in file size.

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Private

All processing is local. Nothing uploaded.

Frequently Asked Questions

Can I compress WebM screen recordings?

Yes. WebM from Chrome's screen recorder, OBS, and other tools all work perfectly.

Does WebM to MP4 conversion reduce quality?

At 70%+ quality settings, quality loss is minimal. MP4 H.264 is also more widely supported.

My WebM has no audio — is that okay?

Yes. Video-only WebM files will be compressed to MP4 with no audio track.

How long does WebM compression take?

Similar to MP4: 1–5 minutes for most files depending on length and device speed.

No-Upload Compression

How browser-based compression keeps your files private.

Compress Screen Recording

Guide specifically for screen recording compression.

Compress MP4

Compress the most common video format.

Ready to compress your WebM?

Go to the Video Compressor →