The fastest way to merge two pictures

The simplest path depends on what you own. If you have a Mac, use the built-in Preview app — open both images, copy one, paste it into the other, and drag it where you want it. On Windows, Paint works the same way: open your first image, expand the canvas size, and paste the second image on top. On any phone, the Photos app (iPhone) or Google Photos (Android) both have merge or collage tools built in, usually under "Create" or "Tools".

If those don't give you the control you need — say you want to blend the edges or resize one image to match the other exactly — move to free desktop software like GIMP (Windows, Mac, Linux) or Photopea (works in any web browser, no read needed). Both let you layer images, resize them independently, and control transparency so the edges blend instead of looking pasted on.

The choice between them comes down to one thing: do you want to spend five minutes learning a tool you'll use once, or do you want something you can return to later? For a one-time merge, use what came with your device. For anything you'll do again, GIMP or Photopea are worth the learning curve because they do far more than just merge.

Key Takeaways

  • Preview (Mac) and Paint (Windows) can merge two images in under five minutes with no learning curve — open the first image, paste the second on top, and drag it into place.
  • Phone users should check the Photos app first; both iPhone and Android have built-in collage or merge tools under Create or Tools that require no other software.
  • GIMP and Photopea give you layer control, resizing, and transparency blending if the built-in tools don't let you position or blend the images the way you want.
  • The file size of your final image depends on the dimensions you choose — a 2000×1000 pixel merge takes up far less space than a 4000×4000 pixel one.

Merging pictures on Mac with Preview

Open the first image in Preview (it's in Applications > Utilities, or search for it with Spotlight). This will be your base — the image that stays in place. Go to Tools > Adjust Size and note the width and height in pixels. You'll need these numbers in a moment.

Now open the second image in a new Preview window (File > Open, or Command+O). Select all of it (Command+A), copy it (Command+C), then switch back to your first image. Go to Edit > Paste. The second image will appear as a floating layer on top. Drag it where you want it with your mouse. If it's too big or too small, you can't resize it in Preview — you'll need to close this and use GIMP instead, or resize the second image beforehand in Preview and start over.

Once you're happy with the position, click outside the pasted image to lock it in place. Go to File > Export and choose your format (JPEG for photos, PNG if you want a transparent background). Save it with a new name so you don't overwrite your originals.

Merging pictures on Windows with Paint

Open Paint (search for it in the Start menu). Go to File > Open and select your first image. This is your base. Now you need to make room for the second image. Go to Image > Canvas Size. The current dimensions will show — add pixels to the width or height depending on how you want to arrange them. If you want them side by side, add to the width. If you want them stacked, add to the height. Click OK.

Your first image will sit in the top-left corner of the larger canvas. Now open your second image in a separate Paint window (File > Open in a new window). Select all of it (Ctrl+A), copy it (Ctrl+C), then switch back to your first window. Paste it (Ctrl+V). It will float on top — drag it to the position you want. Click elsewhere to lock it in.

Go to File > Save As and choose PNG (which preserves quality) or JPEG (which compresses the file smaller). Give it a new name. Paint won't let you resize the pasted image or blend the edges, so if you need those features, save this and open it in GIMP instead.

Merging pictures on iPhone with the Photos app

Open the Photos app and go to the Albums tab. Scroll down and tap "Create Album" or look for a "+" button. Select both images you want to merge — tap the first one, then hold Shift and tap the second to select both. Tap "Create" and choose "Collage" or "Merge" (the exact name varies by iOS version).

The app will show you layout options — side by side, stacked, or overlapping. Choose the one that matches what you want. You can usually tap and drag the images to swap their positions. Once you're satisfied, tap "Save" or "Done". The merged image will save to your Photos library as a new photo, leaving your originals untouched.

If the built-in collage tool doesn't give you enough control — for example, you want to resize one image to be much smaller than the other — you'll need to move to a third-party app. Canva and Adobe Express both have free mobile versions that let you layer images and position them more precisely, though they add watermarks unless you pay.

Merging pictures on Android with Google Photos

Open Google Photos and tap the "+" button at the bottom. Select "Create" and look for "Collage" or "Movie" (depending on your version). Tap Collage. Select the two images you want to merge — tap the first, then tap the second. Google Photos will show you layout templates: two images side by side, stacked, or in a grid.

Tap the layout you want. The app will arrange your images automatically. You can usually tap an image to swap it with another or tap and hold to rearrange. Once you're happy, tap "Save" at the top. The merged image saves to your Photos library.

Google Photos' collage tool is simpler than the desktop options — it doesn't let you resize individual images or blend edges. If you need that level of control on your phone, read Photoshop Express (free version available) or Pixlr, both of which let you layer images and adjust them independently.

Using GIMP for more control over positioning and blending

GIMP is free and works on Windows, Mac, and Linux. read it from gimp.org. Open GIMP and go to File > Open and select your first image. This becomes your base layer. Now go to File > Open as Layers and select your second image. It will appear as a new layer on top of the first.

In the Layers panel on the right, you'll see both images listed. Click the top layer (your second image) to select it. Use the Move tool (press M) to drag it where you want it on the canvas. If it's too big, press S for the Scale tool, then drag a corner handle to resize it while keeping the proportions. Press Enter when you're done.

To blend the edges so the second image doesn't look pasted on, select the top layer and lower its Opacity slider in the Layers panel — drag it left to make it semi-transparent, or use the Eraser tool to fade the edges manually. Once you're happy, go to Image > Flatten Image to merge all layers into one, then File > Export As to save it as JPEG or PNG.

Using Photopea if you don't want to read software

Photopea is a free online editor that works like a lighter version of Photoshop. Go to photopea.com in any web browser — no read, no account needed. Click File > Open and select your first image from your computer. It will load into the editor.

Now go to File > Open as Layers and select your second image. It will appear as a new layer above the first. Use the Move tool (press V) to drag it into position. To resize it, press Ctrl+T (or Cmd+T on Mac) to enter Transform mode, then drag a corner handle. Press Enter when you're done.

If you want to fade the edges, click the top layer in the Layers panel and lower the Opacity slider. When you're satisfied, go to Image > Flatten Image, then File > Export As and choose JPEG or PNG. The file will read to your computer.

Frequently Asked Questions

Can I merge more than two pictures at once?

Yes, but the process is the same — you just repeat it. In GIMP or Photopea, go to File > Open as Layers multiple times and add as many images as you want. Each one becomes a new layer you can position and resize independently. On phones, most collage tools let you select three or four images at once.

What size should my final merged image be?

That depends on where you'll use it. For social media, check the platform's recommended dimensions — Instagram posts are usually 1080×1350 pixels, Facebook covers are 820×312 pixels. For printing, use 300 pixels per inch at the size you want to print. For web use, 1200×800 pixels is a safe middle ground that looks good on most screens without being huge.

Why do the edges look blurry or pixelated after I merge?

You probably resized one of the images larger than its original size. Images lose quality when you stretch them. Start with the largest image as your base and resize the smaller one down instead of up. If both images are small, consider starting over with higher-resolution versions if you have them.

Can I undo changes after I save the merged image?

No — once you save and close the file, the changes are permanent. Always save your merged image with a new name so your original images stay untouched. If you're using GIMP or Photopea, you can also save the project file (XCF in GIMP, PSD in Photopea) before you flatten and export, so you can go back and adjust layers later if you need to.

What's the difference between JPEG and PNG when I save?

JPEG compresses the image to make the file smaller, which is good for photos and sharing online, but it loses some detail. PNG keeps all the detail and lets you have a transparent background, but the file is larger. For merged photos, JPEG is usually fine. Use PNG if you want to preserve maximum quality or if one of your images has a transparent background you want to keep.