How do I crop to a square?

From 16:9 footage, set the width to 56 per cent and the left offset to 22 per cent, leaving the height at 100. That takes a centred square from the full height.

Why percentages instead of pixels?

Because a rectangle described in per cent means the same thing at any resolution, so the same numbers can be reused on a different copy of the same footage.

Can I remove a watermark by cropping it off?

Only if it sits at an edge you are willing to lose. If it does not, use the blurring tool — and remember that removing somebody else's mark may not be yours to do.

Does cropping reduce the file size?

Usually yes, and roughly in proportion to the area removed, because there is genuinely less picture to store.

Crop Video

Keep a rectangle of the picture and throw the rest away.

Everything runs inside your browser. Your files never leave your device.

Drop your file here

.mp4, .m4v, .mov, .qt, .webm, .mkv, .ts, .mts, .m2ts · they stay on this device

Ask about Crop Video

Questions about what this tool does, which option to pick, or what it can and cannot handle.

This is the one part of the site that uses a server. The question you type here is sent to an AI provider to be answered — your files and whatever you put in the tool above are not, and the assistant cannot see them. Answers are generated and can be wrong; the tool itself is not guessing.

About the Crop Video

Cropping throws part of the picture away for good, which is what makes it useful. A recording made in landscape needs to become a tall rectangle for a phone-shaped feed. A screen capture has a browser's toolbars around the thing worth showing. A talk was filmed from too far back and the speaker occupies a third of the frame.

The rectangle is given as percentages rather than pixels, and that is deliberate. A percentage means the same thing whether the source is 4K or 480p, which means the same settings can be applied to a second file of a different size and still describe the same part of the picture. Left and top place the corner; width and height set how much is kept from there.

Two things about the result are worth expecting. The output is smaller in every sense — fewer pixels across, fewer down, and a proportionally smaller file — because the discarded region genuinely stops existing rather than being hidden. And the dimensions are nudged to even numbers, since practically every video encoder in existence refuses odd ones.

For the common social-media shapes, a little arithmetic helps. A square from a 16:9 source is 56 per cent of the width, centred, which means starting 22 per cent from the left. A 9:16 portrait crop from the same source is 32 per cent of the width, so 34 per cent from the left. Those are the two that come up constantly, and they are worth writing down somewhere.

If your aim is to conceal something rather than to reframe — a name badge, a face, a licence plate — cropping is the wrong instrument unless what you want gone happens to sit at the edge. Blur Part of a Video handles the middle of the frame.

How to use it

1Add the video.
2Set how far in from the left and the top the kept rectangle starts.
3Set its width and height as a percentage of the original frame.
4Crop, check the reported dimensions under the result, and download.

Questions

How do I crop to a square?: From 16:9 footage, set the width to 56 per cent and the left offset to 22 per cent, leaving the height at 100. That takes a centred square from the full height.
Why percentages instead of pixels?: Because a rectangle described in per cent means the same thing at any resolution, so the same numbers can be reused on a different copy of the same footage.
Can I remove a watermark by cropping it off?: Only if it sits at an edge you are willing to lose. If it does not, use the blurring tool — and remember that removing somebody else's mark may not be yours to do.
Does cropping reduce the file size?: Usually yes, and roughly in proportion to the area removed, because there is genuinely less picture to store.