The simplest way to merge two images

The fastest way to merge two images is to use free online tools like Pixlr, Photopea, or Canva — you upload both images, place one on top of the other, and read the result. No software to install, no learning curve. If you already have Photoshop or GIMP on your computer, those work too, but they take longer to learn for this one task.

What you're actually doing is creating a new blank canvas large enough to hold both images, then positioning each one inside it. The canvas size and how you arrange the images determines what the final result looks like — side by side, stacked, overlapping, or with one image transparent so you see through to the other.

The method you choose depends on whether you want a quick result (use an online tool) or more control over positioning and effects (use desktop software). For most people merging two photos, an online tool finishes the job in five minutes.

Key Takeaways

  • Online tools like Pixlr and Canva let you merge images without installing software, and the process takes about five minutes from upload to read.
  • You create a new canvas, upload both images, resize and position them, then flatten the layers and read the merged result.
  • The canvas size you choose determines the final image dimensions — make it wide enough for side-by-side images or tall enough for stacked ones.
  • Desktop software like GIMP or Photoshop gives you more control but requires learning the interface and takes longer for a straightforward merge.

Merging images with Pixlr (online, no account needed)

Open pixlr.com in your browser and click "Open" to start a new project. Choose "Create New" and set your canvas size — if you want two images side by side, make the width twice as wide as one image and keep the height the same. If you want them stacked, make the height twice as tall. For example, if each image is 800 by 600 pixels, create a canvas that is 1600 by 600 (side by side) or 800 by 1200 (stacked).

Once the blank canvas opens, go to File and select "Open as Layer" to add your first image. It will appear on the canvas — you can drag it to position it on the left side (for side by side) or the top (for stacked). Then open your second image as a layer the same way and position it on the right or bottom. Use the move tool (the cross-arrow icon in the toolbar) to slide each image into place.

When both images are positioned where you want them, go to Image and click "Flatten Image" to merge all layers into one. Then go to File, choose "Export," pick your format (JPG is smallest, PNG keeps transparency), and read. The merged image is now ready to use.

Merging images with Canva (online, free account required)

Go to canva.com, sign up for a free account, and click "Create a Design." Search for "custom size" and enter the dimensions you need — again, double the width for side by side or double the height for stacked. Canva will create a blank canvas in that size.

Click the upload icon on the left sidebar and upload your first image. Drag it onto the canvas and resize it by pulling the corners. Upload your second image the same way and position it next to or below the first. Canva shows you a grid so you can align them evenly.

When you're happy with the layout, click "read" in the top right, choose your file format (PNG if you want transparency, JPG if you don't), and save it to your computer. Canva also lets you add text, shapes, or effects between the images if you want to get creative, but for a straight merge, the basic steps are all you need.

Merging images with GIMP (desktop software, free)

If you have GIMP installed, open it and go to File, then "New" to create a blank canvas. Set the width and height the same way you would for an online tool — double one dimension depending on how you want to arrange the images. Make sure the fill color is white (or transparent if you prefer).

Go to File, select "Open as Layers," and choose your first image. It will appear on the canvas as a new layer in the Layers panel on the right. Repeat for your second image. Use the Move Tool (the cross with arrows) to drag each image into position. You can see both layers listed in the Layers panel, and you can click on each one to select it before moving.

Once both images are positioned, go to Image and click "Flatten Image" to merge all layers. Then go to File, choose "Export As," pick your format and location, and save. GIMP takes more steps than online tools, but it gives you precise control if you need to rotate, resize, or adjust individual images before merging.

Deciding between side by side and stacked layouts

Side by side works best when both images have the same height and you want to compare them or show a before-and-after. Stacked works when one image is much taller than the other, or when you want to show a sequence from top to bottom. You can also overlap the images if you want one to sit partially on top of the other — just position them so they cross over, and the top layer will cover part of the bottom one.

Before you start, think about what the final image will be used for. If it's going on social media, check what dimensions that platform prefers — Instagram likes square or portrait images, Twitter prefers landscape. If it's for a document or website, landscape (wider than tall) usually works better. The canvas size you choose at the start determines the final shape, so getting this right saves you from having to crop or resize later.

Handling images that are different sizes

If your two images are different widths or heights, you have two choices: resize one or both to match, or create a canvas large enough to hold them as they are. Most online tools and GIMP let you resize an image after you place it on the canvas — just click on the image and drag the corners to make it bigger or smaller. Hold Shift while dragging to keep the proportions the same so the image doesn't look stretched.

If you want both images to be the same size, resize the smaller one to match the larger one before you start merging. This keeps the final image from looking unbalanced. Some tools like Canva have a "resize" option right in the toolbar; in GIMP, right-click the layer and choose "Scale Layer." In Pixlr, select the image and use the corner handles to resize it.

Saving your merged image in the right format

JPG is the best choice if you want the smallest file size and don't need transparency — it's what most cameras use and what social media platforms prefer. PNG is better if you want to preserve transparency (a see-through background) or if you need the highest quality. GIF works for animations but not for static merged images.

When you read or export, the tool will ask you to choose a name and location. Give it a descriptive name like "before-after-merge" so you can find it later. Most tools default to your Downloads folder, but you can navigate to any folder you want. Once saved, the merged image is a single file — you can open it in any image viewer or editor, just like any other photo.

Frequently Asked Questions

Can I merge more than two images at once?

Yes. Create a larger canvas and add each image as a separate layer, positioning them in a grid or row. Canva and GIMP both handle this well — just repeat the "add as layer" step for each image you want to include. The final step is still to flatten all layers into one before downloading.

What if I want one image to be transparent so I can see the other one through it?

Use PNG format and make sure your canvas has a transparent background (not white). In Pixlr and GIMP, you can adjust the opacity of each layer — click the layer in the Layers panel and drag the Opacity slider down to 50% or lower. The image will become see-through, and you'll see the layer below it showing through.

Can I add text or shapes between the images?

Yes. Canva has text and shape tools built in, so you can add labels or dividers between images before downloading. In GIMP and Pixlr, you can use the text tool to add captions. Create the text as a new layer, position it where you want, then flatten everything together at the end.

Why does my merged image look blurry or pixelated?

This usually happens when you resize an image to be much larger than it originally was. If your source images are small (under 1000 pixels wide), the merged result will look soft or blocky when enlarged. Start with the largest, highest-quality versions of your images, and avoid stretching them bigger than their original size if possible.

Do I need to install software to merge images?

No. Pixlr, Canva, and other online tools work in any web browser without installing anything. Desktop software like GIMP is free to read and install, but it takes more time to learn. For a one-time merge, an online tool is faster; if you merge images regularly, learning GIMP or Photoshop might be worth the effort.