MergePNG

Overview

MergePNG is an innovative, browser-based image merging tool designed for ultimate privacy and convenience. It allows users to combine multiple PNG, JPG, and WebP images into a single unified image file (PNG, JPG, WebP) or a PDF document, entirely offline. By leveraging your browser's capabilities, MergePNG ensures that no files are ever uploaded to a server, guaranteeing that your images remain private on your device. The intuitive drag-and-drop interface makes ordering images simple, while a variety of layout presets and customization options empower users to create perfect composites for any need.

Key Features

• Local Processing: All image merging happens directly in your browser, ensuring no uploads and complete data privacy.
• Multi-Format Support: Seamlessly combine PNG, JPG, and WebP files in a single merge job.
• Flexible Layouts: Choose from various presets including stack, side-by-side, 2/3 column grids, and complex compound layouts like 1+2 or 2+3.
• Transparency Preservation: Maintains PNG alpha channels, perfect for layering logos or images with transparent backgrounds.
• Image Customization: Adjust gaps, outer margins, alignment, add borders with custom colors/thickness, and apply rounded corners.
• Rotate & Flip: Correct image orientation directly within the tool before merging.
• Duplicate Detection: Identifies and flags byte-for-byte identical images using SHA-256 hashing.
• Offline Functionality: Works perfectly even without an internet connection after the page has loaded.
• Mobile Friendly: Optimized for use on mobile browsers like iOS Safari and Android Chrome, with adaptive scaling for canvas limits.
• Output Options: Save your merged image as PNG, JPG, WebP, or combine images into a multi-page or single-page PDF.

Pros & Cons

Pros:

• Superior Privacy: No file uploads eliminates server-side storage risks.
• Completely Free: No cost, no watermarks, no sign-up, and no file count limits.
• Versatile Input: Handles mixed image formats with ease.
• User-Friendly: Intuitive drag-and-drop, real-time preview, and pre-visualized layout templates.
• Reliable Offline Use: Ensures productivity even without internet access.
• Transparency Maintained: Crucial for professional graphics work.

Cons:

• Browser Memory Dependent: Practical limit on merge size determined by device's browser pixel cap (e.g., 16.7M pixels on iOS Safari).
• No Advanced Editing: Focuses solely on merging; no separate image editing features beyond basic adjustments.

Who Benefits Most?

MergePNG is ideal for anyone needing to combine images quickly and securely without installing software. This includes graphic designers, web developers creating sprites or contact sheets, content creators making collages, marketing professionals compiling visuals, and everyday users who prioritize privacy when handling personal photos or screenshots. Its offline capability makes it invaluable for those with intermittent internet access or strict security requirements.

Use Cases

• Web Development: Create image spritesheets or combine UI elements efficiently.
• Social Media & Marketing: Design engaging collages or banner images from multiple sources.
• Documentation: Stack multiple screenshots into a single instructional image.
• Photography: Combine photos for creative effects or to present a series.
• Privacy-Conscious Users: Merge sensitive im