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Crop Image
Crop photos to standard aspect ratios or custom dimensions instantly.
Image Comparison
Image Comparison Online — Free, No Upload
Inspect pixel variations using a dynamic Before/After slider, or easily merge multiple images into a combined file.
Click or drag images to compareSupports multiple PNG, JPG, JPEG, and WebP images up to 20MBYou can also paste an image with Ctrl+V
No images uploaded
Upload two or more images above to start comparing and combining.Was this tool helpful?Your feedback helps us make TinyTools better
Quick Start Instructions
Inspect pixel details with an interactive Before/After image slider or securely merge multiple photos into a single combined file. Fast, private, and 100% browser-based.
- 1Upload your images using the dropzone or file selector.
- 2Choose your comparison mode: Slider or Combine.
- 3For Slider mode, select two images and move the interactive slider handle to inspect differences.
- 4For Combine mode, set the layout to horizontal or vertical, customize margins, and download the merged result.
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Frequently Asked Questions
Is my image data uploaded to a server?
No. All comparison, slider rendering, and canvas merging happen locally inside your web browser. Your images never leave your device.
How many images can I compare at once?
You can upload and queue as many images as you need. The slider mode precisely compares two selected images, while the combine mode supports stitching multiple images together.
Can I download the combined image?
Yes. In combine mode, you can layout images horizontally or vertically, adjust the margins and background color, and download the high-quality merged file as PNG or JPEG.
Does this tool support transparent PNGs?
Yes, PNG transparency is fully preserved when using the transparent background setting.
Detailed Guide & Overview
What is an Image Comparison Tool?
An image comparison tool is a utility that allows users to visually inspect two or more images side-by-side or through an interactive slider to identify pixel-level differences. These tools are heavily used by developers for visual regression testing, photographers for color grading, and designers for layout evaluation.
Key Comparison Workflows
Our free online image comparison tool provides a fast, browser-based workbench to inspect visual differences and merge multiple images without installing heavy graphic editors. It supports two primary professional workflows:
- Before/After Slider: Select two images (Image A and Image B) and drag an interactive divider handle across the canvas to compare fine pixel changes dynamically. This is the industry standard method for verifying compression artifacts, color correction, or precise UI layout shifts.
- Combine & Merge: Join multiple images together horizontally or vertically into a single consolidated image. You can customize the spacing gap, select background fill colors (including transparency support for PNGs), and instantly download the merged result in PNG or JPEG format.
Fast, Private, and 100% Client-Side Processing
Security and privacy are prioritized. Your photos never leave your device. All calculations, slider comparisons, and canvas merging tasks are executed locally in your browser using standard HTML5 Canvas APIs. This architecture eliminates server upload wait times, ensures zero data retention, and allows the tool to function entirely offline once loaded.