How to use it
- Choose a video file (MP4, WebM or MOV that your browser can play).
- Pick a shape. Free keeps the whole frame and lets you type any size.
- Drag the bright rectangle on the preview, or type its left and top edge and its size in pixels.
- Press Crop video, wait while it records, then preview and download.
How it works
The video plays into a canvas the size of the crop, and only the chosen rectangle of each frame is drawn there. The canvas and the sound are recorded with the browser’s MediaRecorder. A preset shape gives the largest centred rectangle of that ratio, with sides rounded down to even pixels.
Worked example
A 1920 × 1080 clip cropped to 9:16: the height stays 1080, the width is 1080 × 9 ÷ 16 = 607.5, rounded down to 606. Centred, the left edge is at (1920 − 606) ÷ 2 = 657 px. The result is 606 × 1080, ready for vertical feeds.
Tips
- Changing the width with a shape selected changes the height to match; pick Free to set both yourself.
- To change the shape without cutting anything off, use the aspect ratio changer instead: it adds bars or a blurred background.
- Recording runs at normal speed, so trim long clips first.