Compare Two Images Online

Compare two images with an interactive slider, pixel-difference view, or transparent overlay. Useful for spotting edits, quality changes, and design revisions.

Drag & drop your image here

or

Select exactly 2 images to compare

How to Compare Two Images

  1. Click "Select 2 Images" and choose exactly two photos from your device
  2. Drag the slider left and right to reveal each image
  3. Switch between Slider, Side by Side, Difference, or Overlay modes
  4. Toggle between horizontal and vertical orientation
  5. Click "Swap" to switch which image is on each side
  6. Click "Download" to save the current comparison as PNG

Comparison Modes

Slider

Drag a divider across the images to reveal one or the other. Perfect for before/after comparisons where alignment matters.

Side by Side

View both images next to each other at full size. Great for comparing photos that have different dimensions or compositions.

Difference

Highlights pixel-level differences in red. Unchanged areas appear in grayscale. Ideal for spotting subtle edits or detecting changes.

Overlay

Blends both images at 50% opacity. Useful for checking alignment, registration, or transparency differences.

Popular Use Cases

Before & After Edits

Compare original and edited photos to see exactly what changed — perfect for photo retouching, color grading, or filter effects.

Design Review

Spot differences between design iterations, wireframes, or mockup versions with pixel-level accuracy.

Quality Assurance

Compare compressed vs. original images to check quality loss, or verify renders match expected output.

Find the Differences

Use the Difference mode to instantly reveal even the tiniest changes between two seemingly identical images.

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Frequently Asked Questions

In Slider, Difference, and Overlay modes both images are scaled to match the larger dimension. In Side by Side mode each image keeps its original size.

Difference mode compares every pixel between the two images. Areas that are the same appear in grayscale, while differences are highlighted in red with intensity proportional to the change.

No. Everything runs locally in your browser using the HTML5 Canvas API. Your images never leave your device.

This tool compares exactly two images at a time. For combining multiple photos, try our Combine Images tool.