1. Peakpx
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2. Cactus
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3. online crop

"Cactus" image original width is 3000px, original height is 2255px, you can crop it to any sizes with width less than 3000px and height less than 2255px. 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.