Before & After Image Slider Compare two images side-by-side with an interactive before/after slider.

What Is Image Comparison Slider?

An interactive image comparison slider that lets you place two images side by side with a draggable divider. Perfect for before-and-after comparisons, A/B testing designs, showing editing progress, and highlighting differences between image versions. The slider handle can be dragged left or right to reveal more of either image. Works with touch and mouse for mobile and desktop use.

Why Use Image Comparison Slider?

• Interactive drag-to-compare slider
• Works on mobile touch and desktop mouse
• Visual before/after reveals
• Download comparison at any slider position

Common Use Cases

Photo Editing

Show before and after results of photo retouching and color grading.

Design Reviews

Compare design iterations side by side for stakeholder feedback.

Real Estate

Show renovation or staging before-and-after comparisons.

Product Demos

Demonstrate the effect of filters, edits, or enhancements.

Technical Guide

Two images are stacked using absolute positioning. The top image uses CSS clip-path: inset(0 X% 0 0) where X is derived from slider position. Mouse and touch event listeners track drag position as a percentage of container width. Canvas compositing generates the downloadable output by drawing both images and a divider line.

Tips & Best Practices

• 1
  Use images of the same dimensions for best results
• 2
  The slider works best with aligned subjects
• 3
  Download captures the comparison at the current slider position
• 4
  Great for demonstrating image processing results

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Frequently Asked Questions

Q Do images need to be the same size?

Both images are scaled to match, but same-size originals produce the best alignment.

Q Can I use it on mobile?

Yes — the slider supports both touch drag and mouse drag interactions.

Q Can I download the comparison?

Yes — the download captures both images with the divider at the current position.

Q What formats are supported?

All common image formats: JPG, PNG, WebP, GIF, and BMP.

Q Is the slider keyboard accessible?

The slider responds to mouse and touch input for broad accessibility.

About This Tool

Image Comparison Slider is a free online tool by FreeToolkit.ai. All processing happens directly in your browser — your data never leaves your device. No registration or installation required.