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Image Difference Checker - Online Visual Compare

Development Image Tool compare diff image pixel
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Image Difference Checker — Online Visual Compare

Upload two images and instantly compare them side‑by‑side, with a slider overlay, or highlight pixel differences. Private & fully browser‑based.

Image 1 (Left / Before)

Drag & drop or click to browse

Preview Image 1
Image 2 (Right / After)

Drag & drop or click to browse

Preview Image 2
Fine (more differences) Coarse (fewer differences)
Image 1

Image 1

Image 2

Image 2

Before After
Slider comparison works best when both images have identical dimensions. We recommend using same‑size images for accurate overlay.

Upload two images to start comparing

Frequently Asked Questions

JPEG, PNG, GIF, WebP, BMP and most common bitmap formats are supported. Vector images (like SVG) may not display correctly in all modes.

It compares each pixel's color channels (RGB) using a mathematical distance. When the difference exceeds the sensitivity threshold you set, the pixel is highlighted in red; otherwise it remains in grayscale. Adjust the slider to control how strict the comparison is.

No. All processing happens locally in your browser. Your images never leave your device. We do not store, transmit, or have access to your files.

Yes — side‑by‑side and difference highlight modes handle different dimensions automatically. The slider overlay mode works best when both images have the same width and height; otherwise a warning appears and you can still use the other two modes.

Once both images are loaded, switch to “Slider Compare”. Move the vertical handle left or right to reveal different portions of the two images. You can click and drag anywhere on the image, or use the invisible slider at the bottom.

In “Difference Highlight” mode a Download button appears. Click it to save the highlighted comparison as a PNG image. The download is generated instantly in your browser.
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