About JPG Joiner.
JPG Joiner is a suite of 6 free online image tools that run entirely in your browser. No uploads, no accounts, no watermarks. It started as a single image merging tool and grew into a full toolkit because the same privacy-first, no-friction approach works for every common image task.
Our Tools
- JPG Joiner - Merge multiple JPG images into one file with vertical, horizontal, or grid layouts.
- JPG to PDF - Combine images into a single PDF with A4, Letter, or custom page sizes.
- Merge PNG - Merge PNG files into one lossless image with transparency preserved.
- PDF to JPG - Convert every page of a PDF into high-resolution JPG images.
- Photo Collage - Build photo collages with varied layout templates, custom spacing, and rounded corners.
- Image Resizer - Resize JPG, PNG, and WebP to exact pixel dimensions or by percentage.
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 tools that check three boxes: process images entirely in the browser with zero server uploads, have a clean and intuitive interface that works well on phones, and provide full-featured output without paywalls or watermarks. Every tool on this site meets all three.
How It Works
All six tools use 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, processes your images according to the task, and exports the result as a new 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 tools.
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 any 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].