Image Compare – Free Online Image Comparison Tool

Compare two images with a drag slider, fade overlay, pixel diff highlight, or linked side-by-side view. 100% browser-based, nothing uploaded.

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Features

🎚️

Drag Slider Compare

Drag a vertical divider to reveal image A on the left and image B on the right.

🌗

Fade Overlay

Blend image B over image A with an adjustable opacity slider to spot subtle changes.

🔴

Pixel Diff Highlight

Automatically computes a pixel-level difference map, highlighting changed areas in red.

🔗

Side-by-Side Crosshair

View both images side by side with a synced crosshair marker that follows your cursor or tap.

🔒

Privacy First

All comparison and diff computation runs locally in your browser — images are never uploaded.

⬇️

Export & Share

Export the current comparison as a PNG, or generate a shareable link for others to view.

How to Use

1

Upload Two Images

Drag & drop, click to upload, or paste with Ctrl+V for image A and image B.

2

Pick a Comparison Mode

Choose slider, fade overlay, diff highlight, or side-by-side view.

3

Inspect the Differences

Drag the slider or opacity bar, or hover over the diff map to inspect exact pixel values.

4

Export or Share

Download the comparison as PNG, or share a link so others can view the same comparison.

Frequently Asked Questions

What is Image Compare used for?
It helps you visually spot differences between two images — useful for before/after edits, comparing competitor screenshots, checking PS effects, or verifying crop/color adjustments.
Is it free to use?
Yes, Image Compare is completely free with no sign-up required.
Are my images uploaded to a server?
No. All comparison modes, including pixel diff computation, run entirely in your browser using the Canvas API. Images are only uploaded if you explicitly choose to create a share link.
What image formats are supported?
PNG, JPG, GIF, and WebP are all supported.
What does the diff highlight mode show?
It compares the two images pixel by pixel and highlights differing pixels in red, while unchanged areas are shown in grayscale, making even small changes easy to spot.
Can I compare images with different dimensions?
Yes. Images are automatically scaled and centered to fit the comparison canvas without distortion, and a warning is shown if the aspect ratios differ.

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