About JPG Joiner.

JPG Joiner is a free online tool for combining multiple images into a single file. It was built out of frustration with existing image merging tools that either upload files to unknown servers, add watermarks to free output, or hide basic features behind paywalls.

Why We Built This

After testing over a dozen image merging tools, we found the same problems everywhere. Most tools require you to upload your images to their servers for processing. Some process files in minutes but store copies for hours or days. A few add watermarks or limit the number of free merges per day. The tools with the best user interfaces only output PDF files, not the JPG images that most people actually need.

We wanted a tool that checks three boxes: processes images entirely in the browser with zero server uploads, has a clean and intuitive interface that works well on phones, and provides full-featured output without paywalls or watermarks. JPG Joiner is that tool.

How It Works

JPG Joiner uses the HTML5 Canvas API, a browser-native technology available in every modern web browser. When you upload images, they are read directly into your browser's memory. The tool creates a canvas element, draws your images onto it in your chosen layout, and exports the result as a new JPG file. The entire pipeline runs in JavaScript within your browser's sandbox. No HTTP requests carry your images to any server.

The website itself is built with Astro, a modern static site generator that pre-renders all pages at build time. The interactive tool components use React and load only when you scroll to them (a technique called partial hydration). This architecture means the page loads fast and the SEO content is always available to search engines, while the tool itself loads just-in-time when you need it.

Our Commitment to Privacy

We take a strict approach to privacy: your images never leave your device. There is no upload step, no temporary storage, no server-side processing. When you close the browser tab, all image data is released from memory. We do not use cookies to track image processing activity. The only data we collect is standard web analytics (page views, referral sources) to understand how people find and use the tool.

This is not just a marketing claim - it is a technical fact. You can verify it yourself by opening your browser's network inspector (F12, then the Network tab) while using the tool. You will see zero outgoing requests containing image data.

Contact

Found a bug, have a feature request, or want to reach out? Email us at [email protected].