What is Before After Slider?
Before After Slider is an interactive image comparison tool that helps you visualize differences between two images. Whether you're showcasing photo edits, design revisions, or restoration work, the draggable slider makes it easy to see exactly what changed.
Simply upload two images — one for "before" and one for "after" — and use the slider to reveal each image. The tool supports both horizontal and vertical comparison modes, giving you flexibility in how you present your comparisons.
Common Use Cases
Photo Editing
Web Design
Retouching
Restoration
Product Photography
Your Data Stays Private
No Uploads
Images never leave your device
- Zero server transmission
- Complete local control
No Tracking
We don't collect or store your images
- No data collection
- No analytics on images
Instant Results
No server processing, everything runs locally
- Real-time comparison
- No waiting time
How to Use Before After Slider
Upload Your Images
You'll see two upload zones — one labeled Before and one labeled After. You can:
- Click on either zone to open the file picker
- Drag and drop an image directly onto the zone
Supported formats include JPEG, PNG, and WebP. Once uploaded, a thumbnail preview appears. Click the × button to remove an image and upload a different one.
Start Comparing
After uploading both images, click the Compare button. The slider view will appear with your images side by side. Drag the handle left or right to reveal each image.
Customize Your Comparison
- Switch orientation — Toggle between horizontal (left/right) and vertical (top/bottom) modes using the toolbar buttons
- Swap images — Click the swap button to exchange the before and after images
- Edit labels — Type custom labels in the toolbar inputs (e.g., "Original" / "Retouched")
Download or Start Over
Click the download button to save your comparison as a PNG image with the divider line and labels included. To create a new comparison, click the reset button to return to the upload screen.
Keyboard Shortcuts
← → Arrow Keys
Shift + ← →
↑ ↓ Vertical Mode
Features
Interactive Draggable Slider
The core of the tool is a smooth, responsive slider that works with mouse, touch, and keyboard. Click anywhere on the image or drag the handle to adjust the comparison point.
- Real-time updates with no lag
- Smooth animation and transitions
- Multi-input support (mouse, touch, keyboard)
Horizontal and Vertical Modes
Compare images side by side (horizontal) or top to bottom (vertical). Horizontal mode is ideal for landscape images, while vertical mode works well for portrait or tall images.
- One-click mode switching
- Auto-reset to center position
- Optimized for different image orientations
Custom Labels
The default "Before" and "After" labels can be customized directly in the toolbar. Type any text you want — for example, "Original" / "Enhanced" or "Day 1" / "Day 30".
- Instant label updates
- Unlimited text length
- Perfect for branded comparisons
Swap Images
Quickly exchange the before and after images with a single click. This also swaps the label text, so everything stays consistent.
- One-click image swap
- Automatic label synchronization
- Maintain comparison context
Download as PNG
Save your comparison as a high-quality PNG image. The downloaded file includes the divider line and labels at the current slider position.
- Original resolution quality
- Includes divider and labels
- Ready for social media sharing
Touch and Mobile Support
The slider is fully touch-enabled for smartphones and tablets. Drag with your finger to compare images, and the remove buttons are always visible on mobile for easy access.
- Native touch gestures
- Responsive mobile interface
- Optimized button sizes
Keyboard Accessible
Navigate the slider using arrow keys for precise control. Hold Shift to move in larger increments. The tool includes proper ARIA attributes for screen reader compatibility.
- Full keyboard navigation
- Screen reader support
- WCAG accessibility standards
Frequently Asked Questions
What image formats are supported?
You can upload any image format supported by your browser, including JPEG, PNG, WebP, GIF, and BMP. For best results and optimal quality, we recommend using JPEG or PNG formats.
Do my images need to be the same size?
No, but using images with the same dimensions will give the best comparison results. If the images are different sizes, the after image will be automatically scaled to match the before image's display area, ensuring a seamless comparison experience.
Are my images uploaded to a server?
No. All processing happens entirely in your browser using client-side JavaScript. Your images never leave your device and are not stored anywhere on our servers. This ensures complete privacy and security for your sensitive images.
Can I compare more than two images?
This tool is designed for comparing two images at a time for optimal clarity and performance. To compare additional pairs, simply click the reset button and upload new images. You can create as many comparisons as you need.
How does the download work?
The download creates a PNG image at the original resolution of the before image. It captures the current slider position along with the divider line and labels. The quality matches your original image, making it perfect for presentations, portfolios, or social media sharing.
Does it work on mobile devices?
Yes. The slider supports touch gestures, and the interface adapts to smaller screens. You can drag the handle with your finger just like on desktop. All features are fully functional on smartphones and tablets.
What is vertical mode for?
Vertical mode splits the comparison top-to-bottom instead of left-to-right. This is particularly useful for comparing tall or portrait-oriented images where a horizontal split would not show the differences clearly. Examples include full-body photos, tall product shots, or vertical web page designs.
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