Updated June 2026 · runs 100% in your browser

Compress Video

Make a video smaller by re-encoding it to a leaner MP4 — on your device. No upload, no sign-up. Best for shorter clips.

Drop a video here

or click to choose

🔒 Converted on your device · 0 bytes uploaded

First file loads the converter engine (~25 MB). Video encodes on your device, so shorter clips finish fastest.

How it works

ConvertCabin loads a local copy of FFmpeg compiled to run inside this browser tab. Your video is decoded, re-encoded and saved entirely on your device — nothing is uploaded.

The first conversion downloads the engine (about 25 MB) and your browser caches it. Because encoding runs locally and single-threaded, it's slower than a server — so it works best on shorter clips, and stays completely private.

How this compresses

This re-encodes the video with H.264 at a quality level you choose. The CRF value controls the trade-off: a higher number means more compression and a smaller file, a lower number keeps more quality. Encoding runs in your browser, so shorter clips finish faster.

Frequently asked questions

How do I compress a video?
Drop a video, set the compression level, and download the smaller MP4 once it finishes — all in your browser.
What does the slider do?
It sets the H.264 CRF. A higher number compresses more (smaller, lower quality); a lower number keeps more detail (larger file).
Is my video uploaded?
No. Everything happens on your device with a local copy of FFmpeg.