What Is an Image Merge Tool?
An image merge tool is a tool that takes two or more photos and stitches them together into a single image — horizontally side-by-side, vertically stacked, or arranged into a grid. The output is a single PNG or JPG containing all the source images in a chosen layout. Before web tools, merging meant launching Photoshop, creating a new canvas at the right size, dragging each photo in, and aligning by eye — a 10-minute job for a result the average person needs in 30 seconds.
The audience for one is broad: real-estate agents creating before/after photo pairs, e-commerce sellers building multi-angle product shots in a single image, social-media users making side-by-side comparison posts, fitness trainers building progress collages, teachers preparing class slide imagery, and anyone who needs to email two photos as one attachment. The Tooldit image merger runs entirely in your browser using the canvas API, so even personal photos and brand assets stay on your device.
Combine Several Photos Into One Image
When you need to merge images into a single picture — a before-and-after pair, a row of product shots, or a quick two-by-two grid — this tool stitches them together right in your browser. Drop two or more files, arrange them, and download one clean PNG. There is no app to install, no account to create, and the photos you add never leave your device because the whole merge runs on an HTML canvas inside the page you're reading.
How the Layout and Spacing Controls Work
The tool gives you three layout modes and two formatting controls, and a live preview updates the moment you change any of them:
- Side by Side — images are placed in one horizontal row and each is scaled so they share the same height, so a wide and a tall photo still line up cleanly.
- Stacked — images form a vertical column scaled to a shared width, ideal for long "scrolling" comparisons or step-by-step screenshots.
- 2-col Grid — images flow into two columns of equal-sized cells, with each picture centered and contain-fit inside its cell so nothing gets cropped.
- Gap slider — add 0 to 200 pixels of space between every image; set it to zero for a seamless join.
- Background color — choose any color (or type a hex code) to fill the gaps and any empty space in grid cells; white is the default.
Use the up and down arrows on each row to set the order, the trash icon to drop a photo, then click to export. The result saves as a lossless PNG so your colors and background stay exact.
Why People Choose This Merge Tool
- Stays on your device — the canvas does all the work locally, so private screenshots and personal photos are never uploaded.
- Completely free — no trial countdown, no "pro" tier gating the grid layout or the export button.
- No sign-up — the page loads ready to use; you never hand over an email.
- No watermark — the downloaded PNG contains only your images and the background you picked.
- Live preview — see the combined image update as you reorder, change the gap, or swap layouts, before you commit to a download.
Everyday Ways to Use It
- Before-and-after posts — a contractor, stylist, or fitness coach puts two photos Side by Side for an instant comparison to share on social media.
- Resale listings — a seller on a marketplace stacks several angles of an item into one image so buyers see everything in a single thumbnail.
- Mood boards and proofs — a designer drops four reference shots into the 2-col Grid with a neutral background to send a client one tidy proof.
- Support screenshots — combine a sequence of app screenshots vertically so a help desk can read the steps in order from a single attachment.
Want to tidy each photo first? Trim them with the Image Cropper before you merge, or convert formats with the PNG Converter so every image matches.
Image Merge vs Other Tools
Versus Photoshop / GIMP — both can merge images but require manual canvas setup and alignment. Tooldit auto-arranges in one click.
Versus Canva collage templates — Canva offers pre-designed collage templates, but uploads your images and limits some exports behind sign-up. Tooldit gives the same merge for free with no upload.
Versus phone collage apps (Layout by Instagram, Pic Stitch) — mobile collage apps are convenient but lock you to one device and ecosystem. The browser tool works everywhere.
Versus PowerPoint / Google Slides — you can drag photos onto a slide and export, but the workflow is heavy for a single merged image. Tooldit is more direct.
Troubleshooting & Common Issues
- Photos with different aspect ratios look mismatched — horizontal/vertical merges align by short edge, leaving gaps or cropping. For a clean look, pre-crop all sources to the same aspect ratio with the image cropper.
- Output is huge — merge preserves source resolution. If you merge two 24-megapixel photos side-by-side, you get a 48-megapixel output. Downscale sources first if file size matters.
- Spacing between photos looks uneven — the gap setting applies the same number of pixels between every pair. If sources are different sizes, the gap may look proportionally different; resize sources to the same dimensions first.
- Background color shows through transparent areas — transparent PNG sources show whatever color you set as the merge background. Set background to transparent and export as PNG to preserve transparency through to the final.
- Order changed after adding more photos — new photos append at the end of the list. Drag thumbnails to reorder, or remove and re-add in the desired order.
- Grid layout uneven with non-square photo count — 3 photos in a 2×2 grid leaves one empty cell. Pick a layout that matches your count, or add a filler image.
Frequently Asked Questions
+What layouts can I use to merge my images?
There are three: Side by Side places images in a single horizontal row scaled to a shared height, Stacked arranges them in a vertical column scaled to a shared width, and 2-col Grid lays them out in two columns with each image centered inside an equal-sized cell. Pick the one that fits how you want the final image to read.
+Can I control the spacing and background between merged images?
Yes. A gap slider lets you add 0 to 200 pixels of space between every image, and a background color picker fills that gap and any empty grid cells with the exact color you choose. Set the gap to 0 and the images sit flush against each other with no visible seam.
+Does merging images upload my photos to a server?
No. Every step happens inside your browser on an HTML canvas. Your photos are loaded, drawn, and exported to a PNG locally, and nothing is ever sent to Tooldit or any third party. You can confirm this by watching your browser's network tab while you merge.
+What format and quality is the merged file?
The merged result is exported as a lossless PNG named merged.png. Because the tool scales each image with high-quality smoothing and draws at the full source resolution, the output stays sharp even for large photos. PNG also preserves the background color you set without any compression artifacts.
+How do I change the order of the images before merging?
Each image in the list has up and down arrows. Use them to move a photo earlier or later in the sequence, which is the order it appears left to right, top to bottom, or across grid cells. You can also remove any image with the trash icon, and a live preview updates as you reorder.
+How many photos can I merge at once?
Practically up to 20–30 photos depending on resolution and device memory. For larger photo collages, merge in batches (e.g. 4 images at a time, then merge the results).
+Can I add borders or rounded corners?
Use the gap setting for spacing and the background color for the visible border. For rounded corners or fancier framing, run the merged output through the image editor.
+Are my photos uploaded anywhere?
No. The merge happens on a canvas in your browser. Photos are decoded, placed, and re-encoded locally; nothing is uploaded or stored on a server.