Merge multiple JPG images into one.

Yes, JPG Joiner is free with no premium tier, no daily limits, and no hidden fees. Most "free" tools cap you at 3-5 images or slap a watermark on the output. This JPG joiner free tool has none of that. You can merge 50 images at once if your device handles it. We built it this way because the tool runs entirely in your browser - there are no server costs for us, so there is nothing to charge you for. The full feature set (grid layouts, borders, spacing, quality control, custom output size) is available to every user on every visit.

No. This is the main reason we built JPG Joiner. Most competing tools send your files to a remote server for processing. That means your personal photos, ID scans, medical documents, or private screenshots pass through someone else's infrastructure. JPG Joiner uses the HTML5 Canvas API built into your browser. Your images go from your device into browser memory, get drawn onto a canvas, and export as a new JPG. Zero network requests carry your image data. Close the tab and everything is gone from memory.

JPG, JPEG, PNG, and WebP. You can mix them freely in a single merge - three JPG photos with two PNG screenshots works fine without any conversion step. The output is always a standard JPG file, which keeps file sizes small for photos and complex images. If you specifically need PDF output instead (for printing or email attachments), use the JPG to PDF tool on this site, which accepts the same input formats.

There is no artificial limit. You can combine jpg files into one jpg with 100+ images on a desktop with 8 GB RAM. On a typical smartphone, 20-40 images work smoothly. Whether you need to merge two jpg files into one or combine multiple jpg files into one jpg, the tool handles it the same way. If you are merging very high resolution photos (4000x3000 pixels or larger), you might notice slowdown after 30 images because the Canvas API holds all pixel data in memory. Tip: close other browser tabs before a large merge to free up RAM.

Yes. JPG Joiner is designed mobile-first. Open jpgjoiner.com in Safari, Chrome, or any modern mobile browser. Tap the upload area to open your photo picker, select multiple images, pick your layout, and download the merged result. The entire flow takes about 20 seconds for 3-5 photos. On iOS you can also copy an image from the Photos app and paste it directly onto the page (Cmd+V or long-press paste). No app installation, no account creation.

Vertical stacks your images top to bottom into a tall, narrow image - useful for combining screenshots, chat conversations, or document scans into one scrollable file. Horizontal places images side by side left to right - good for before-and-after comparisons, product lineups, or creating a banner. Grid arranges images in rows and columns (you pick 2-6 columns) - ideal for photo collages, contact sheets, product catalogs, or Instagram-style mood boards. All three modes center smaller images automatically.

Tap "Customize output" below the layout selector. You will see sliders for border width (0-50 px), spacing between images (0-50 px), and color pickers for border color and background fill. For example, a white background with 10 px spacing creates a clean collage look. A black border with 5 px width creates a framed gallery effect. The preview updates live as you drag the sliders, so you can experiment without committing.

Yes. Inside "Customize output" you will find Output Size controls with three modes. Original keeps the natural merged dimensions (no scaling). Custom lets you type exact pixel values for width and height, with an optional lock to maintain the aspect ratio. Scale % lets you drag a slider from 10% to 200% to proportionally shrink or enlarge the output. A "Smooth" vs "Sharp" toggle controls the resampling method - use Smooth for photos and Sharp for pixel art or screenshots with text.

It controls JPG compression. At 92% (the default), the output looks identical to the originals but is about 40-60% smaller in file size. At 100% you get maximum detail with a larger file. At 80% you see minor compression artifacts but save significant space - fine for web use or messaging. Below 60%, blocky artifacts become obvious around edges and text. For most users, the default 92% is the right choice. Only lower it if you need to meet a specific file size limit for an email attachment or upload form.

Mostly yes. Once the page has fully loaded, the merging tool works without an internet connection because all processing uses the Canvas API built into your browser. You can upload images from your device, arrange them, merge, and download - all offline. The catch: you need internet to load the page initially. If you know you will be offline (a flight, a remote area), load jpgjoiner.com while connected and keep the tab open.