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WAVESPEED AI · Compare Images No upload
100% FREE

Compare ImagesFind every difference between two images.

Compare two images with a before and after slider, side by side with zoom, an overlay or a pixel-difference heatmap.
Get the share of changed pixels, PSNR and SSIM. Free, private and no watermark.

Slider, side by side, overlay and differencePSNR and SSIMDone in your browser. Your images are not uploaded.
No sign-up No upload No watermark

Image A (before)

Drop an image here, paste one, or choose a file.

Image B (after)

Drop an image here, paste one, or choose a file.

Or try an example

Drop two images anywhere here to compare them. JPG, PNG, WebP, GIF, BMP or AVIF, up to 100 MB each.

EXAMPLES

Try six comparisons.

Each example opens a photo next to an edited copy made in your browser. Your own images work the same way.

THREE SIMPLE STEPS

How do I compare two images online?

01

Add two images

Drop, paste or choose image A and image B. Swap them any time.

02

Pick a view

Use the slider, side by side with zoom, an overlay, blink, or the difference heatmap with adjustable amplification and threshold.

03

Read the numbers and download

See the share of changed pixels, the largest and mean difference, PSNR and SSIM, then save the view or the difference image as a PNG.

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Need images to compare?

Create or edit photos with WaveSpeed AI, then check the result against the original here.

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Compare Images · FAQ

How do I compare two images online?

Add image A and image B, then choose a view: slider, side by side, overlay, difference or blink. Everything runs in your browser.

How do I find the difference between two images?

Choose the Difference view. Brighter colors mark pixels that changed more; raise the amplification to see faint changes and the threshold to ignore tiny ones. The panel shows the share of changed pixels.

What do PSNR and SSIM mean?

PSNR is the signal-to-noise ratio in decibels; higher means the images are closer, and identical images show infinity. SSIM measures structural similarity from 0 to 1, where 1 means identical. Open “How the numbers are measured” for the exact definitions.

What if the images are different sizes?

You get a warning. By default B is stretched to the size of A. You can instead align B at the top-left or center without scaling; the numbers then cover only the area both images share.

Can I make a before and after slider image?

Use the Slider view and download the current view as a PNG. It is a still picture of the slider at its current position, not an interactive widget.

Are my images uploaded?

No. Both images are decoded and compared in your browser and never leave your device.

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