Checking a re-compressed export
An original PNG and a re-saved JPEG of the same image
Pixel Diff mode highlights the compression artifacts in red, with a percentage of pixels that changed.
Image Comparison Tool
Compare two images side by side, with a reveal slider, or as a pixel-level difference overlay.
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About this tool
Two versions of an image usually differ in ways worth seeing precisely — a resize, a filter, a re-export at lower quality. Side-by-side is fastest for a quick look; a slider makes small differences obvious; a pixel-diff overlay finds the ones neither format catches by eye.
How to use it
- Upload two images.
- Switch between Side by Side, Slider (drag to reveal one over the other) and Pixel Diff modes.
- In Pixel Diff mode, download the highlighted difference image if needed.
Examples
Common problems
- Pixel Diff highlights almost the entire image, even though it looks the same.
- The two images likely differ in dimensions — one gets padded onto a white canvas the size of the larger one rather than stretched, so if their actual pixel dimensions don't match, the padding itself reads as a difference. Resize one to match the other before comparing pixel-for-pixel.