Choose two images
Load a before and after image in supported browser-decodable formats.
SLIDER · SIDE BY SIDE · DIFFERENCE
Compare two images precisely
Compare two images with a before-and-after slider, side-by-side view and downloadable pixel-difference highlight.
Compare two images
Local analysisHOW IT WORKS
A private browser workflow
Your files stay in this tab and are not sent to an image-processing server.
Inspect visually
Use a keyboard-accessible reveal slider or view both images side by side.
Measure differences
Compare RGBA pixels at original dimensions with an adjustable tolerance.
Export evidence
Download the red difference map as a PNG when you need to share it.
Common questions
Can images have different sizes?
Yes. They are compared on a canvas large enough for both; unmatched areas count as different.
What does the threshold do?
It ignores channel differences at or below the selected value from 0 to 100.
Are files uploaded?
No. Decoding, viewing and pixel analysis happen locally.