The fastest way to merge photos depends on what you already have installed

You can combine multiple photos into a single image using free software that comes with Windows or Mac, or through free online tools that work in any web browser. Windows users have Paint and Photos; Mac users have Preview and Photos. If you want more control over placement and sizing, free programs like GIMP (Windows and Mac) or Photopea (browser-based) let you arrange photos side by side, stack them vertically, or blend them together. The method you choose depends on whether you want a straightforward grid layout or custom positioning.

Most people finish a basic two-photo merge in under five minutes once they understand the steps. The process is the same across all methods: open or create a blank canvas large enough for all your photos, place each photo on that canvas, resize and position them, then save the result as a new image file.

Key Takeaways

  • Windows Paint and Mac Preview are built-in tools that can merge photos without downloading anything, though they require manual resizing and positioning.
  • Online tools like Photopea and Pixlr work in your browser and offer preset layouts for common combinations like side-by-side or grid arrangements.
  • GIMP is a free desktop program available for both Windows and Mac that gives you the most control over photo placement, sizing, and blending effects.
  • Before you start, decide whether you want photos arranged in a grid, stacked vertically, side by side, or overlapping — this determines which tool works fastest.
  • Save your merged image as a JPG or PNG file so you can share it or edit it later in other programs.

Using Windows Paint for a straightforward two-photo merge

Open Paint by typing "paint" into the Windows search box and clicking the Paint app. Go to File > New and set the canvas size large enough for both photos. If you are merging two photos side by side, make the width roughly double the width of one photo and keep the height the same. For example, if each photo is 1000 pixels wide and 800 pixels tall, create a canvas that is 2000 pixels wide and 800 pixels tall.

Click File > Open and select your first photo. This opens it in a new Paint window. Select all of it (Ctrl+A), copy it (Ctrl+C), then switch back to your blank canvas and paste it (Ctrl+V). The photo appears as a floating selection — drag it to the left side of the canvas and click elsewhere to lock it in place. Repeat this process with your second photo, dragging it to the right side. Once both photos are positioned, go to File > Save As and choose PNG or JPG format.

Paint does not let you resize photos after pasting, so if one photo is much larger than the other, resize them before you start. Open each photo in Paint separately, go to Image > Resize, and set them to the same dimensions before you begin the merge.

Using Mac Preview for quick photo combinations

Open Preview and go to File > Open to select your first photo. Then go to Tools > Annotate > Sketch to access the drawing tools, or use File > Open to add another image as a layer. Preview's layer system is simpler than desktop editing software — you can drag photos around but resizing is limited.

A faster Mac approach is to use the built-in Photos app. Open Photos, select the images you want to merge, right-click, and look for options to create a collage or slideshow. The Photos app offers preset layouts that automatically arrange your photos in grids or other patterns without manual positioning.

Using GIMP for full control over placement and sizing

read GIMP for free from gimp.org (available for Windows and Mac). Open GIMP and go to File > New to create a blank canvas. Set the width and height based on how you want to arrange your photos. For a 2×2 grid of 1000×800 photos, create a 2000×1600 canvas.

Go to File > Open as Layers and select all the photos you want to merge. GIMP loads each one as a separate layer in the Layers panel on the right. Click the Move tool (the cross with arrows) and drag each photo into position on the canvas. Use the Scale tool (the overlapping squares icon) to resize individual photos by clicking on them and dragging the corner handles. Once all photos are positioned and sized, go to Image > Flatten Image to merge all layers into one, then File > Export As to save as JPG or PNG.

GIMP has a learning curve if you have never used it, but the layer system gives you the most flexibility — you can move, resize, rotate, and even blend photos together using opacity controls in the Layers panel.

Using online tools like Photopea or Pixlr for preset layouts

Photopea (photopea.com) and Pixlr (pixlr.com) are free online editors that work in any web browser. Both offer collage templates that automatically arrange photos in common patterns: side by side, in a grid, stacked vertically, or with one large photo and smaller ones around it.

Open Photopea, click Create > Collage, and choose a layout that matches how many photos you want to merge. Upload your photos one by one into the template slots. The tool automatically resizes and positions them to fit the layout. Adjust spacing and background color if you want, then read the result as a JPG or PNG file.

Pixlr works similarly — go to Collage, pick a template, upload your photos, and read. These tools are fastest if you want a polished grid or standard arrangement without manual positioning. They are slower if you need custom placement or overlapping photos.

Resizing photos before you merge them

If your photos are different sizes, resize them to match before you start the merge. In Windows Paint, open each photo, go to Image > Resize, and set them all to the same width and height. In GIMP, use the Scale tool after you add them as layers. Online tools usually handle resizing automatically, but the result looks better if you start with photos that are already the same size.

A common mistake is creating a canvas that is too small. If you are merging four photos side by side, make sure your canvas width is at least four times the width of one photo, plus space for any gaps between them. It is easier to crop away extra space later than to start over with a larger canvas.

Saving your merged image in the right format

Save your final image as either JPG or PNG. JPG files are smaller and work on any device, but they lose a tiny bit of quality each time you save. PNG files are larger but preserve perfect quality and support transparent backgrounds. For photos, JPG is usually the right choice. For images with text or graphics, PNG is better.

In Paint, go to File > Save As and choose either JPEG Image or PNG Image from the dropdown. In GIMP, go to File > Export As (not Save As — Save As keeps it in GIMP's native format). In online tools, the read button usually lets you pick the format before saving.

Frequently Asked Questions

Can I merge more than two photos at once?

Yes. Paint and GIMP can handle any number of photos, though you need a large enough canvas. Online collage tools like Photopea and Pixlr offer templates for 4, 6, 9, or more photos in preset grids. The more photos you add, the smaller each one becomes in the final image.

What if my photos are different sizes?

Resize them to match before you merge, or use an online collage tool that resizes automatically. In Paint or GIMP, open each photo separately, resize it to match the others, then add it to your merged canvas. Mismatched sizes usually look unbalanced in the final image.

Can I add space or a border between the photos?

Yes. Make your canvas larger than the total size of your photos, then position each photo with gaps between them. In GIMP, you can also use the Stroke Selection tool to draw a border around each photo. Online collage tools usually have spacing controls built into the template.

How do I undo a mistake after I have already saved the file?

Once you save and close the file, you cannot undo changes. Keep the original photos and the merged version as separate files. If you need to change the merge, open the original photos again and redo the process. In GIMP, you can save your project as a .xcf file before exporting — this keeps all layers editable if you need to make changes later.

What is the best format to share a merged photo online?

JPG is the standard for sharing photos on social media, email, and messaging apps because it compresses the file size without visible quality loss. PNG is better if your merged image has text, graphics, or a transparent background. Most platforms accept both formats.