VidCompress / WebM compression
Shrink a large WebM file and convert it to MP4 in one step, so it fits anywhere and plays on every device.
Or jump straight to a destination:
WebM is an efficient, open format common in screen recorders and web tools — but a long capture or a high-bitrate export can still be large, and not every app or platform accepts WebM. Compressing it both shrinks the file and, by default, converts it to MP4 for universal compatibility.
VidCompress reads your WebM, re-encodes it to a target size, and outputs an MP4 that plays everywhere. Files under 300 MB are processed in your browser, so nothing is uploaded.
Quick reference
Choose a target size
Use a destination preset (Email, Discord, WhatsApp, Telegram) or a custom MB target depending on where the file is going.
Drop in the WebM
Add your WebM file. VidCompress reads its resolution and length to plan an efficient encode.
Compress and convert
The WebM is re-encoded to your target and converted to MP4 in the same pass.
Download the MP4
Save the result. It is smaller and plays on platforms and apps that do not support WebM.
How do I compress a WebM file?
Drop the WebM on this page and pick a target size. VidCompress re-encodes it smaller and converts it to MP4 in one step.
Does it convert WebM to MP4?
Yes. The output defaults to MP4 (H.264), which is compatible with platforms and editors that do not accept WebM.
Why is my WebM file so large?
Long screen recordings and high-bitrate exports produce big WebM files even though the format is efficient. Re-encoding to a target size brings them down.
Do I need to install anything?
No. WebM compression runs in your browser; files under 300 MB stay on your device.
Is it free?
Yes. The free plan compresses up to 300 MB locally with no signup or watermark.