Blind A/B comparison tool
Load two versions of the same image. Compare them with a slider, side by side, or by flipping between them, at true pixel zoom. Then run a blind test that hides which is which.
How to get a fair result
- Load image A and image B: drop them, pick them or paste them.
- Choose slider, side-by-side or flip mode, and zoom to 100% or more.
- Start a blind test: each round shows a random crop with the sides hidden and shuffled.
- Pick the better side with the buttons or the arrow keys.
- Read the reveal, then download a labelled comparison image if you want to share it.
Need two results to compare? Run the same source through a faithful and a creative upscaler. For example, a free no-sign-up upscaler and a local Upscayl run. Then follow our test method.
FAQ
Are my images uploaded?
No. The tool reads your files with your browser’s File API and draws them on a canvas on your device. Nothing is sent to a server.
What if the two images are different sizes?
Image B is scaled to match image A’s dimensions so the regions line up, and the tool tells you when it has done this. For a fair test, export both upscales at the same size.
How does the blind test work?
Each round picks a random crop region and randomly decides which image appears on the left. You choose the better side for your goal. After the last round the tool reveals how often you preferred A and how often B.