Cut·rotate photo
Select the area to cut above the photo and rotate·flip horizontally or vertically. Save a edited copy via touch or number entry.
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Result
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How to use and processing criteria
Cuts and rotates or flips left/right a rectangular area from the original photo as needed.
Actual example
Width 1,200px: when selecting left 100px, top 50px, width 400px, and height 300px in a photo, it becomes 400×300px. Applying rotation in the clockwise direction 90 also rotates the image. The result is 300×400px.
Frequently Asked Questions
How to select the area for photo cropping on mobile?
Dragging above the photo shows a blue border. You can choose square·4:3·16:9 ratios and enter numbers to specify left·top·horizontal·vertical pixels.
How are rotation and left/right reversal applied?
Cut the selected area, rotate clockwise, and reverse left/right for the final result. The original file remains unchanged, and a new PNG or JPG copy is saved.
Calculation criteria and reference materials
- MDN — Canvas image drawing
Cutting, arranging, and rendering new image pixels for the original area
Verification of calculation criteria: · Calculation·verification principles · Report errors