AnyTools
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Image Merge Tool

Merge multiple images into one with horizontal, vertical, or grid layouts. Perfect for image composition and long image creation.

Upload Images

Click or drag images to this area to upload

Supported formats: JPG, PNG, GIF, WebP, SVG

❓What is Image Merge Tool

Image merge tool for combining multiple images into one according to specified layout, supporting horizontal, vertical, and grid layout modes.

✨Features

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Multiple Layout Modes

Supports horizontal, vertical, and grid layout modes to meet different merging needs
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Flexible Customization

Set image spacing and background color, support custom grid rows/columns for complete control over merge results
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Real-time Preview

Display merge preview immediately after uploading images, adjust parameters for real-time updates
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High Quality Output

Uses Canvas API for pixel-level processing, maintains original image quality, supports PNG format output

📋Usage Guide

1️⃣
Step 1
Upload images to merge (supports multiple selection).
2️⃣
Step 2
Select layout mode (horizontal, vertical, or grid) and adjust parameters.
3️⃣
Step 3
Preview merge result and download when satisfied.

📚Technical Introduction

🔬Image Merging Principle

Image merging combines multiple images into one according to a specified layout. Horizontal merge: calculate total width (sum of all image widths + spacing) and max height; vertical merge: calculate max width and total height (sum of all image heights + spacing); grid merge: arrange by rows and columns, calculate grid dimensions. Uses Canvas API's drawImage() method to draw each image to target position, supports custom spacing and background color.

⚙️Canvas Image Composition

Implementation: create Canvas → set dimensions (calculated based on layout) → fill background color → loop to draw each image to specified position → export with toDataURL(). Horizontal: accumulate x coordinate; vertical: accumulate y coordinate; grid: calculate x, y based on row/column index. Supports: custom spacing, background color, image alignment, quality settings, etc.

💡Creative and Practical Scenarios

Image merging is used for: long image creation (vertical merge of multiple screenshots), comparison display (horizontal side-by-side comparison), puzzle making (grid layout), social media (multi-image composition), design layout (image combination), document organization (merge multi-page screenshots). Helps quickly compose images and create visual effects, a practical tool for image processing.
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Frequently Asked Questions

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What layout modes are supported?

The tool provides three layout modes: horizontal merge (images arranged left to right), vertical merge (images arranged top to bottom), and grid merge (arranged in row×column grid). Horizontal merge is suitable for comparison images, vertical merge for long images, and grid merge for puzzle effects.
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How to create a long image?

Select vertical merge mode, upload images to merge, and the tool will automatically arrange images from top to bottom. You can set image spacing and background color, then download when satisfied with the preview.
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Will merging reduce image quality?

No, the tool uses Canvas API for pixel-level processing, maintaining original image quality. Output format is PNG, ensuring high-quality output.
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How many images can be merged at once?

Theoretically unlimited, but it's recommended to use reasonably based on browser memory and performance. It's recommended to merge no more than 20 images at once to ensure processing speed and stability.
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Can I adjust image spacing?

Yes, the tool supports custom spacing settings (0-100px), allowing you to adjust the blank space between images for a more beautiful merge result.

🔗Related Documents

📖MDN - Canvas API-HTML5 Canvas API for image manipulation and processing
🎓MDN - File API-Working with files and blobs in web applications
⚡Web.dev - Image Optimization-Best practices for optimizing images on the web

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