Tutorial: Build a Before-and-After Image Comparison Tool with HTML, CSS and JavaScript

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A DEV Community guide shows how to build a browser-based before-and-after image comparison tool using only HTML, CSS and JavaScript. Users select two photos from their own computer, which are displayed side by side without being uploaded to any server or stored permanently. The tutorial stresses keyboard accessibility, mobile use and removing images, and is designed to avoid exposing private details such as homes or cars in personal photos. It uses three files, index.html, style.css and script.js, with no frameworks, backend or external libraries required. CSS Grid arranges the images in two columns on larger screens and stacks them on mobile.

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