1. Peakpx
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2. rainbow
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3. online crop

"rainbow" image original width is 3394px, original height is 4519px, you can crop it to any sizes with width less than 3394px and height less than 4519px. drag area with blue border below to select which to crop, double click dark area to toggle "drag" and "crop" mode, use your middle mouse button to zoom in or zoom out, then click blue button to download cropped image.