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What Is a Before-After Image Comparison Slider
An image comparison slider overlays two images and lets viewers drag a divider to reveal one image or the other. This interactive element makes it easy to compare differences between two versions of an image, such as before and after editing, two color treatments, or different processing settings.
Comparison sliders are more effective than placing images side by side because the pixel-level alignment allows viewers to see exact differences at any point in the image. The sliding interaction is intuitive and engaging, making it a popular element in portfolios, product pages, and educational content.
How the Comparison Slider Tool Works
Upload two images and create an interactive comparison that you can embed or screenshot.
- Upload two images — select the before image and the after image, or any two images you want to compare
- Adjust the slider — drag the divider horizontally or switch to vertical split mode to compare different regions of the images
- Capture the comparison — take a screenshot of the slider at any position, or use the tool to visually compare and make editing decisions
Try it free — no signup required
Open Comparison Slider →When To Use Image Comparison
Comparison sliders are the best way to highlight differences between two image versions.
- Photo editing showcases — demonstrate the impact of your editing work by comparing the original and edited versions, perfect for photography portfolios and editing tutorials
- Product before-and-after — show the effectiveness of products like cleaning solutions, cosmetics, or renovation services with compelling visual proof
- Design iterations — compare design versions, color schemes, or layout options to make decisions and communicate changes to clients and team members
Frequently Asked Questions
Do both images need to be the same size?
For best results, both images should have the same dimensions so they align pixel-for-pixel. If images differ in size, the tool scales them to match, but identical dimensions produce the most accurate comparison.
Can I switch between horizontal and vertical split?
Yes. The tool supports both horizontal split (left-right comparison) and vertical split (top-bottom comparison). Vertical split is useful for comparing landscape images or when the differences are more apparent along the horizontal axis.
Can I export the comparison as an image?
The comparison slider is primarily an interactive preview tool. You can position the slider at any point and use your system screenshot tool to capture the comparison at that position for use in presentations or social media.