Free Online Image Compare Tool - Compare Two Images Side by Side
The fastest online image comparison tool to compare two pictures, find differences between photos, and analyze visual changes. Whether you need to compare photos side by side, overlay images with fade, or highlight pixel differences — this free image comparer handles it all instantly.
100% private and secure — all image comparison happens directly in your browser. No uploads to servers, no tracking, no watermarks. Works offline, supports PNG, JPEG, WebP, GIF, and is completely free for personal and commercial use.
Why Use This Online Image Comparison Tool?
Unlike other picture comparison tools that require uploads or subscriptions, our image comparer is completely free, works instantly in your browser, and keeps your images private.
Instant Image Diff
Compare pictures online in real-time. See differences immediately — no waiting, no processing delays, no file size limits.
100% Private & Secure
Your images never leave your device. Unlike other online image compare tools, we don't upload your photos to any server.
Multiple Compare Modes
Five powerful comparison modes: Split view, Fade overlay, Slider, Highlight differences, and Subtract. Choose the best method for your needs.
Pixel-Perfect Analysis
Detect even the smallest differences between two images. Our highlight and subtract modes reveal changes invisible to the naked eye.
No Watermarks
Compare and analyze images without any watermarks or branding. Your images remain exactly as they are.
Works Offline
This image comparator works without internet once loaded. Compare photos anytime, anywhere — no server dependency.
Detailed Metadata
View comprehensive image details: resolution, DPI, color depth, format, subsampling, interlace, and orientation.
Mobile Friendly
Fully responsive design works on desktop, tablet, and mobile. Compare images on any device without installing apps.
No Sign-up Required
Start comparing immediately — no registration, no email, no accounts. This free image compare tool respects your time and privacy.
Five Powerful Image Comparison Modes
Our image diff tool offers multiple ways to compare two pictures. Each mode is designed for specific comparison needs — from quick visual checks to detailed pixel analysis.
Split (Side by Side)
Compare photos side by side in separate panels. Perfect for quick visual comparison of layout, composition, or overall differences between two images.
Fade (Overlay)
Overlay two images and fade between them using an opacity slider. Ideal for spotting subtle changes in the same area — watch one image dissolve into the other.
Slider (Swipe)
Drag a vertical divider across both images to reveal differences. The left side shows one image, right side shows the other — excellent for pixel-perfect alignment comparison.
Highlight (Glow)
Automatically detect and highlight all pixel differences in bright magenta. The base image appears dimmed while changed areas glow — instantly spot what's different.
Subtract (Difference)
Mathematical pixel subtraction reveals exact differences. Identical areas appear black, differences show as colored pixels — the most technical mode for detecting tiny variations.
What Can You Compare?
Our versatile image comparison tool handles any visual content. From photos to screenshots, designs to documents — if it's an image, you can compare it.
Photo Comparison
Compare two photos to find differences, verify edits, or check image quality. Perfect for photographers reviewing retouching work or comparing shots.
- Before/after photo edits
- Compare similar photos
- Verify image authenticity
- Check compression quality
- Compare two pictures same person
Design Comparison
Compare design iterations, mockups, and visual assets. Essential for designers reviewing changes, checking brand consistency, or comparing versions.
- UI/UX design iterations
- Logo and branding changes
- Website screenshot comparison
- App interface versions
- Marketing material revisions
Document & Screenshot
Compare screenshots, scanned documents, or any visual content. Ideal for QA testing, document verification, or tracking visual changes over time.
- Screenshot comparison testing
- Document version comparison
- PDF page comparison
- Scanned document verification
- Visual regression testing
How to Compare Two Images Online?
Using our online image compare tool is simple. Follow these four steps to compare pictures and find all visual differences:
Upload First Image
Drag and drop or click to upload your first image (original or before version) in the left panel.
Upload Second Image
Add the second image (modified or after version) in the right panel for comparison.
Choose Compare Mode
Select from Split, Fade, Slider, Highlight, or Subtract mode based on your comparison needs.
Analyze Differences
Use zoom controls and different modes to thoroughly analyze all visual differences between images.
Pro tip: Use "Highlight" mode to instantly spot all pixel differences — changed areas glow in magenta against a dimmed background.
For subtle differences, try "Subtract" mode — identical pixels appear black while differences show as colored pixels.
Supported Image Formats
Our image comparison tool supports all popular image formats. Compare any combination of formats — the tool handles format differences automatically.
Lossless with transparency
Photos and complex images
Modern web format
Simple graphics and animations
Vector graphics
Apple device photos
Frequently Asked Questions
What is an image comparison tool?
An image comparison tool (also called image diff or picture comparer) analyzes two images and helps you find visual differences between them. It can show changes side by side, overlay images, or highlight exactly which pixels are different.
How do I compare two images online?
Simply upload or drag-drop your first image in the left panel and second image in the right panel. Choose a comparison mode (Split, Fade, Slider, Highlight, or Subtract) to visualize the differences between your images.
Is this online image compare tool free?
Yes, this image comparer is 100% free for both personal and commercial use. No sign-ups, no usage limits, no watermarks, no hidden fees, and no premium tiers.
Is my data secure with this image comparison tool?
Absolutely. All image comparison happens locally in your browser — your images are never uploaded to any server. Your photos remain completely private on your device.
Can I compare photos side by side?
Yes! Use the 'Split' mode to compare photos side by side in separate panels. You can also use the 'Slider' mode to swipe between images in the same space.
How does the Highlight mode work?
Highlight mode analyzes every pixel in both images and marks differences in bright magenta. The base image appears dimmed/grayscale while changed areas glow — making it easy to spot exactly what's different.
What is Subtract mode used for?
Subtract mode performs mathematical pixel subtraction between images. Identical pixels become black (0,0,0), while differences appear as colored pixels. It's the most technical mode for detecting even tiny variations.
Can I compare images of different sizes?
Yes, the tool handles images of different dimensions. It uses the larger dimensions as the canvas size and compares overlapping areas. Non-overlapping areas will show as differences.
Does this image diff tool work offline?
Yes, once the page loads, you can use this image comparator without internet connection. All processing happens in your browser — no server required.
What image details can I view?
The Details mode shows comprehensive metadata: file type, size, dimensions, horizontal and vertical DPI, color depth, format (RGB, YCbCr, etc.), subsampling, filter type, interlace method, and orientation.