Does my video get uploaded anywhere?

No. The video is decoded and re-encoded in your browser with WebCodecs. It never leaves your device, and once the page has loaded it works offline.

How much smaller will my MOV get?

It depends on the source. A high-bitrate recording can shrink a lot at the smaller-file setting, while a clip that is already compact may barely change. After compressing you'll see the exact before-and-after sizes.

Which quality level should I pick?

Smaller file applies the strongest compression for the smallest result. Balanced is a sensible middle ground. Higher quality keeps more detail at a larger size. Start with Balanced and try Smaller file if you need it lighter.

It says my browser can't encode H.264. What now?

Compressing re-encodes the video to H.264, which needs a hardware or software encoder your browser exposes. Chrome and Edge have one; Firefox does not. Open this page in Chrome or Edge and try again.

Why did my file get bigger instead of smaller?

Re-encoding an already-tiny or already-compressed clip can add a few bytes of overhead rather than save space. The readout will tell you honestly when the result isn't smaller, so you can keep the original.

Compress MOV

Re-encodes a MOV to H.264 at a lower quality target to shrink it, keeping the .mov container.

What this does

This re-encodes your MOV to H.264 video and AAC audio at a lower quality target, then writes it back into a QuickTime .mov container. The lower the target, the fewer bits each frame gets, so the file shrinks. The picture dimensions and frame rate are kept; only the encoding quality changes.

Compression is lossy: re-encoding discards detail to save space, and you can't recover it later. A clip that is already small or already heavily compressed may not shrink much, and re-encoding a tiny file can even grow it slightly. Encoding runs on your device, so longer or higher-resolution clips take longer.

How it works

1Drop your MOV video or pick it from your device.
2Choose a quality level: smaller file, balanced, or higher quality.
3Click Compress, watch the progress bar, then download the smaller MOV.

Built with open source

Mediabunny — Converts and edits video and audio in the browser via WebCodecs. Add-on encoders cover MP3, AAC, and FLAC. · MPL-2.0

Frequently asked questions

Related tools

All Compress →

Video CompressorCompress a video to a smaller file in your browser. Re-encodes to H.264 at the quality level you pick.Image CompressorCompress JPG, PNG, and WebP images. Each one keeps its format. Defaults aim for the smallest file you can't tell apart from the original.PNG CompressorCompress PNG images. Color quantization cuts real size, and there's a lossless option when you need it.JPEG CompressorCompress JPG and JPEG images in bulk. A quality slider lets you trade size for sharpness.Compress MKVCompress an MKV (Matroska) video to a smaller file in your browser. Re-encodes to H.264 at the quality level you pick.