Is my video uploaded to a server?

No. The video is processed locally in your browser and never leaves your device.

Which formats can I compress?

You can compress MP4, MOV, WebM and MKV files and export them as MP4 or WebM.

Will compressing reduce the quality?

Compression always involves some trade-off. You choose the quality level, so you can balance smaller size against visible detail.

Is there a file size limit?

There's no server limit, but very large files use more of your device's memory and CPU, so a desktop browser is recommended for big videos.

Does it add a watermark?

No. There are no watermarks and no sign-up required.

Yes. The tool is free and runs on your own device, so there are no per-file server charges.

Why is a desktop browser recommended?

Re-encoding video is resource intensive. A desktop has more memory and CPU power, which makes compressing large files faster and more reliable.

Compress Video in Your Browser

Reduce the size of MP4, MOV, WebM and MKV files locally. No uploads, no watermarks, no sign-up — your video never leaves your device.

Runs in your browser — your files are not uploaded

100% local — your video is never uploaded

Select video to compress

Drop your file here

Quick answer

What it does: Reduce the size of MP4, MOV, WebM and MKV files locally. No uploads, no watermarks, no sign-up — your video never leaves your device.
Your files: Never uploaded — processed on your device
Price: Free, no account
Formats: MP4, MOV, WEBM, MKV → MP4, WEBM

Make videos smaller without sending them anywhere

Large video files are hard to email, slow to upload and quick to fill up storage. This tool re-encodes your video to a smaller size directly inside your browser, so you can choose a quality level and get a lighter file in a few steps. Because everything runs on your own machine, your footage stays private and you don't wait on a server queue. It works well for MP4, MOV, WebM and MKV sources and outputs MP4 or WebM.

Why use this video compressor

Runs entirely in your browser — no file is uploaded to any server
Supports MP4, MOV, WebM and MKV input
Exports compact MP4 or WebM output
Adjustable quality so you control the size-versus-clarity trade-off
No watermark, no account and no email required
Free to use with no per-file limits imposed by a server

How to compress a video

Select your video Drag a file onto the tool or click to choose an MP4, MOV, WebM or MKV from your device.
Choose a quality level Pick a target quality. Lower quality means a smaller file; higher quality keeps more detail.
Start compressing Run the compression. The video is re-encoded locally in your browser — nothing is sent online.
Download the result Save the smaller MP4 or WebM file back to your device when it's done.

Your video stays on your device

Compression happens entirely in your browser using your own device's resources, so your video file is never uploaded to a server. We don't store, see or share your media. We do collect anonymous, aggregated usage analytics (such as which tool was used and whether it succeeded) to improve the product — this never includes your filenames, file contents or any personal data.

Verify it yourself: Open your browser DevTools → Network tab and run the tool: no request ever carries your file. Everything happens on your device.

FAQ

Is my video uploaded to a server?: No. The video is processed locally in your browser and never leaves your device.
Which formats can I compress?: You can compress MP4, MOV, WebM and MKV files and export them as MP4 or WebM.
Will compressing reduce the quality?: Compression always involves some trade-off. You choose the quality level, so you can balance smaller size against visible detail.
Is there a file size limit?: There's no server limit, but very large files use more of your device's memory and CPU, so a desktop browser is recommended for big videos.
Does it add a watermark?: No. There are no watermarks and no sign-up required.
Is it free?: Yes. The tool is free and runs on your own device, so there are no per-file server charges.
Why is a desktop browser recommended?: Re-encoding video is resource intensive. A desktop has more memory and CPU power, which makes compressing large files faster and more reliable.