Free Online Image Diff Checker & Visual Comparison Tool
Compare two images visually with side-by-side, slider overlay, and pixel difference modes. Perfect for UI testing, design reviews, and spotting changes. Fast, free, and entirely client-side. Need to compare code? Try our code diff checker.
Common Use Cases for Image Diff Checker
- Visual Regression Testing: Compare before and after screenshots of web pages to detect unintended UI changes after code deployments.
- Design Review: Spot differences between design mockups and implemented versions to ensure pixel-perfect accuracy.
- UI Bug Detection: Identify visual bugs, layout shifts, or rendering issues by comparing screenshots across browsers or devices.
- Quality Assurance: Verify image outputs from graphics processing, filters, or conversion tools by comparing against reference images.
- Brand Asset Verification: Compare logo files, icons, or brand images to ensure consistency across versions and prevent unauthorized modifications.
- Photo Editing Comparison: Review before and after photo edits side-by-side with slider overlay to evaluate retouching and enhancement work.
Powerful Visual Comparison Modes
Side-by-Side Comparison
View both images next to each other for a clear visual comparison. Perfect for comparing screenshots, designs, or before/after images. Supports JPEG, PNG, GIF, WebP, and more.
Slider Overlay Mode
Drag an interactive slider to reveal differences between images. Ideal for spotting subtle changes in UI elements, design tweaks, or visual regressions in the same layout.
Pixel Difference Detection
Automatically highlight exact pixel differences in red. Perfect for visual regression testing, quality assurance, and catching unintended changes. All processing happens in your browser.
How to Use the Image Diff Tool
Upload or drag-and-drop your original image on the left and the modified version on the right. Choose your preferred comparison mode (side-by-side, slider overlay, or pixel difference). The tool will instantly highlight differences, making it easy to spot changes in screenshots, mockups, logos, or any visual content. For resizing images before comparison, use our image resizer.