zsxkib / tool-merge-images

Merge multiple images into clean horizontal or vertical strips with precise alignment and sizing controls.

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Image Strip Merger 🖼️

A practical tool for combining multiple images into clean horizontal or vertical strips. Perfect for creating before/after comparisons, image galleries, or social media collages.

What it does

Upload 2 or more images and this tool will:

  • Merge them into strips - Horizontal or vertical layouts
  • Smart resizing - Automatically harmonize image sizes with multiple strategies
  • Precise alignment - Control how images align within the strip (start, center, end)
  • Border control - Add consistent borders around and between images
  • Format flexibility - Export as WebP, PNG, or JPEG with quality control

Use cases

  • Before/after comparisons - Show transformations side by side
  • Product showcases - Display multiple angles or variations
  • Social media content - Create Instagram-style multi-image posts
  • Documentation - Combine screenshots or diagrams
  • Art portfolios - Display multiple works in one frame

How it works

The tool automatically handles the tricky parts of image merging:

  1. Size harmonization - When images have different dimensions, you can choose to:
  2. Magnify smaller images to match the largest
  3. Reduce larger images to match the smallest
  4. Crop larger images to fit

  5. Keep original sizes

  6. Smart alignment - Images align perfectly whether you want them at the start, center, or end of the strip

  7. Border consistency - Borders are applied uniformly around the entire strip and between individual images

Tips for best results

  • Similar aspect ratios work best for clean strips
  • High resolution images will give you crisp output
  • WebP format provides the best balance of quality and file size
  • Horizontal strips work great for before/after shots
  • Vertical strips are perfect for mobile-friendly content

Technical details

Built with: - PIL (Python Imaging Library) for robust image processing - Cog for easy deployment and API access - Smart memory management for handling large image sets

The tool preserves image quality while optimizing file sizes, and handles transparency properly when working with PNG images.

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