Choose your video
Select a WebM recording.
Web video, wider compatibility
Compress WebM Online
Reduce a WebM clip and export a compact MP4 for apps that prefer H.264.
No uploadNo watermarkNo signup
Drop a video here to startChoose a video to compress
MP4, MOV, WebM, MKV, AVI + more · Up to 1GB desktop / 300MB mobile
On-device processing · Never uploaded or storedRecommended settings
A sensible place to start
Balanced at the original resolution works for most screen captures; choose 720p for smaller delivery files.
The compressor above is preconfigured for this use case. Actual results still depend on the source codec, motion and detail.
Why it works
Spend fewer bits, deliberately
WebM can already be efficient, so dramatic reductions may affect detail. Converting to MP4 can improve compatibility even when size savings are modest.
Three simple steps
How to compress webm online
Set the compression
Choose the output size or quality.
Download the result
Encode locally and download the MP4.
Practical guidance
Get a cleaner result
- Keep resolution for text-heavy screen recordings.
- Use 30 FPS for interface demos.
- Browser codec support varies by WebM source.
Clear answers
Frequently asked questions
Is WebM compression private?
Yes. Standard compression runs inside your browser. The video file is not sent to a VideoShrink server.
Will the output size be exact?
Target-size mode aims slightly below your limit, but container overhead and unusual source files can make the final size vary.
Why can compression take a while?
Encoding is demanding work. Duration, resolution, device speed and browser memory all affect processing time.
Make your video easier to share
Private browser compression. No account required.
Compress Video