Before & After Photo Comparison

How the comparison is made

Both photographs are drawn into a canvas element inside this page, and that is the whole mechanism. Each one is scaled to fit inside 600 by 800 pixels, keeping its aspect ratio by taking the smaller of the two ratios, so nothing is stretched. Side by side, both are then trimmed to the shorter of the two heights so the pair lines up; stacked, both are trimmed to the narrower width. Around them the layout adds 20 pixels of padding, a 60-pixel band for the labels and a 4-pixel divider between the two images.

The result is a new image built from yours. Nothing is enhanced, colour-corrected, aligned or retouched, and no measurement is taken of either photograph — if the light or the angle changed between the two, that difference is in the picture and the tool cannot tell it apart from the change you are documenting.

Your files are read by this page and drawn into the canvas by your own browser, and the download button saves what the canvas holds to your own device.

Nothing on this site is medically reviewed. Every figure above was read out of the code that runs on this page, and where a number is our own judgement rather than a published one, the note says so and cites nothing. Method last checked 21 August 2026.