Image Merger
Combine multiple images into a single image 100% client-side. Adjust custom layouts, gaps, backgrounds, aspect ratios, and export outputs securely in your browser.
Drag & drop images here
or browse files
What is the Image Merger?
Overview and core technical concepts
The Image Merger is a professional, client-side utility designed to streamline image merger tasks with instant processing, privacy guarantees, and customizable options.
Why Use the Image Merger?
Key advantages, developer speedups, and security benefits
Speed & Reliability
Execute calculations and transformations instantly in your local browser memory.
Enterprise Data Privacy
Your data stays on your local device, meeting strict data compliance requirements.
When to Consider Alternatives?
Anti-patterns, limitations, and when to choose an alternative approach
This tool is optimized for modern web browsers supporting Web Cryptography & WebAssembly standards.
Image Merger Example
Sample inputs, expected outputs, and code patterns
Sample Usage Output
Generated result using Image Merger parameters.Common Image Merger Mistakes
Frequent errors, security risks, and how to fix them
Frequently Asked Questions
Client-side image merging uses standard HTML5 Canvas APIs, OffscreenCanvas, and Web Workers. When you upload multiple images, they are decoded directly in your browser's local RAM. Our layout engine calculates rendering coordinates, and the canvas draws them alongside background presets (solid or gradient colors). Finally, the canvas encodes the pixels into the selected format (PNG, JPG, WebP, or AVIF) for local download. Your files never touch any remote server.
We support four layouts: (1) Vertical Stack, which aligns images in a vertical column; (2) Horizontal Row, which aligns images side-by-side; (3) Grid, which distributes images evenly into custom rows and columns; and (4) Custom Canvas, which lets you click, drag, and resize individual image layers freely like a design editor.
There is no hardcoded limitation on the number of uploads. However, since the merging process runs 100% in your device's memory (RAM), uploading extremely large files (e.g. greater than 50MB each) or processing dozens of photos simultaneously may exceed mobile browser heap limitations. For large grids, we recommend utilizing a desktop browser.
PNG is lossless and supports transparency, making it the ideal choice for text screenshots, logos, and illustrations to prevent color bleed or blur. JPG is lossy and doesn't support transparency, but produces much smaller file sizes for photographs. WebP and AVIF offer modern, next-generation compression that achieves high fidelity at extremely low weights, which is optimal for web performance.
Yes. In our layers panel, you can drag and drop images to rearrange their stacking order. Keyboard users can focus on any item in the layer list and press ArrowUp or ArrowDown to swap position layout indices dynamically.
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