Image Merger

How to Use

1. Click the area above to select a file, or drag and drop a file onto the page
2. Adjust parameters in the settings area
3. Click the process button and download the result when ready

Frequently Asked Questions

How It Works

The Image Merger uses the HTML5 Canvas API to composite multiple images into a single output. The tool supports three layout modes: vertical stack, horizontal row, and grid arrangement.

The merge process: (1) All input images are loaded as ImageBitmap objects. (2) Images are resized to uniform dimensions — either matching the first image's size, the largest image's size, or a user-specified target. (3) A new Canvas is created with dimensions calculated from the layout: vertical = (width, sum_of_heights), horizontal = (sum_of_widths, height), grid = (cols × width, rows × height). (4) Each image is drawn to the Canvas at its calculated position using drawImage(). (5) The composited result is exported as JPEG or PNG.

The grid layout calculates rows and columns based on the number of images and a configurable column count, distributing images evenly across the grid with optional spacing.

Tips & Best Practices

• Uniform sizing first: Resize all images to the same dimensions before merging for clean, aligned results without size inconsistencies.
• Grid for catalogs: Use 2×2 or 3×3 grids for product showcases and comparison layouts.
• Vertical for tutorials: Stack screenshots vertically for step-by-step visual guides and before/after comparisons.
• Add spacing: Leave a small gap (5-10px) between images in grids for visual separation and cleaner presentation.
• Match image quality: If merging images of different qualities, compress all to the lowest common denominator for consistent output.
• Consider output size: Many merged images can produce very large files. Plan your layout dimensions based on the target display.

Use Cases

E-commerce managers creating product grid composites showing multiple angles of a product in a single image for listings.

Tutorial creators stacking screenshots vertically to create step-by-step visual guides for blog posts. Social media managers creating side-by-side comparison images for before/after content and product comparisons. Photographers assembling contact sheets showing all images from a shoot in a single preview. Designers creating mood boards by combining multiple reference images in a grid layout. Archivists creating composite preview images from multiple source images for catalog documentation.

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