About this tool
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Aspect Ratio Crop locks a crop selection to a ratio you choose - one of 8 presets (1:1, 4:3, 3:2, 16:9, 21:9, 3:4, 2:3, 9:16) or a custom whole-number ratio. Drag the box to reposition it, or drag any of its 8 corner and edge handles to resize; the selection keeps the chosen ratio and stays inside the image. A rule-of-thirds grid helps with composition, and the output dimensions update live as you adjust.
When you crop, the selected area is drawn onto an HTML5 canvas at the original image resolution - no scaling - and downloaded as a PNG. Everything runs 100% in your browser; images are never uploaded.
Learn how it works →