Image · Free tool
Image Edit Boundary Checker
Compare an original and edited image of the same size. Mark the allowed edit area and see where other pixels changed.
Worked example
The intended edit adds a plant to the upper left. The spill version also changes the bottle label. Compare the two candidates to see the difference in the outside count.
Choose the source images
PNG, JPG or WebP up to 16 MB and 12 million pixels, with edges up to 12,000 pixels. Files stay in your browser.
Counts use decoded RGBA pixels. Compression, color conversion and even a small shift can affect the count. Use aligned lossless exports for a strict check.
Boundary review
Original image
Edited image
Changes outside the allowed area
Pink marks pixels above the threshold outside the outlined rectangle.