Reduce File Size.

Hit a smaller target size by lowering bitrate.

✓ Your videos never leave your device✓ 100% local processing✓ No uploads✓ No account

Processed locally — no upload. Reduce File Size runs entirely in your browser. Large files use more memory and processing time depends on your device. Re-encoded video is exported as WebM here (MP4 requires cross-origin isolation, e.g. a production deploy in Chrome/Firefox).

Drop your video here

or click to browse — MP4, WebM, MOV, MKV, M4V

Files stay on your device · nothing is uploaded

Settings

Load a video to configure reduce file size.

Privacy first100% local processing

Create a smaller video file in your browser

Reduce File Size helps create a smaller copy of a video by lowering bitrate or resolution.

It is useful when a recording exceeds an attachment, upload or storage limit.

All compression work takes place locally on your device.

100% local processing

Your videos never leave your device.

VideoDock processes your files inside the browser tab. Nothing is uploaded to a VideoDock processing server, stored in the cloud or sent to a third-party video processing service.

✓ No video uploads

✓ No account required

✓ Local browser processing

✓ Privacy-first by design

HowSimple workflow

How to use Reduce File Size

Choose the video file that is too large.
Select a smaller target size or lower quality.
Choose the desired resolution.
Process the smaller copy locally.
Download and check the final size.

FormatsBrowser compatible

Supported formats

The tool accepts browser-compatible MP4 and WebM video. Final size is an estimate and can vary according to the source file.

MP4WebM

?Reduce File Size FAQ

Yes. Choose a target size that fits your email provider’s attachment limit.

No. The result is created in your browser and downloaded directly to your device.

→Related tools

Compress Video

Shrink file size with a quality/bitrate target.

Compress MP4

Reduce the size of MP4 footage in your browser.