1. Peakpx
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2. 5 dices
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3. online crop

"5 dices" image original width is 2976px, original height is 1984px, you can crop it to any sizes with width less than 2976px and height less than 1984px. 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.