Two or more images in, one image out. Pick the images, let the merger choose a layout, adjust the gap and size, and save a JPG, PNG or WebP — all on this device.
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An image merger takes two or more separate image files and draws them onto one canvas, saved as a single JPG, PNG or WebP. This one merges images side by side, stacked, in a grid or as an overlay, picks a starting layout from the images you add, and does all of it inside your browser — nothing is uploaded.
The image merger reads what you give it and chooses: two landscape photos go side by side, a set of tall screenshots is stacked into a column, four or more images become a grid. With exactly two images it may also offer before-and-after labels. That is a suggestion, not a detour — close it and carry on, or pick a different layout from the tabs at any time. Nothing you add is lost when the layout changes.
How an image merger actually builds the file
"Image merge" and "merge images" describe the same job, and every image merger does it in four steps, whether you merge two images or ten. What differs between tools is where those steps run and what each one is allowed to change.
1 · Decode. Each file is read into raw pixels. A 12-megapixel phone photo becomes about 48 MB of uncompressed colour data in memory, which is why merging many large photos is slower than the file sizes suggest.
2 · Scale to a shared edge. Images rarely arrive the same size, so the merger has to decide how they meet. Side by side, the default is equal height: every image is scaled proportionally to one height, so nothing is cropped or stretched. Stacked, it is equal width. In cells, Fit keeps each image whole inside its cell and Fill covers the cell and trims the overflow.
3 · Draw on one canvas. The scaled images are painted onto a single canvas with the gap, outer border, background colour and corner radius you set. Labels, if you turned them on, are drawn here too.
4 · Encode once. The canvas is compressed a single time into the format you picked. Each source image is decoded once and encoded once, so the merge itself adds no extra rounds of compression.
The four stages of an image merge. All of them run in this browser tab.
Image merger comparison
Image mergers — photo mergers, as some sites call them — look alike from the outside — an upload box and a download button. The differences are in how many images they take, where the work happens and what the free download carries. Three widely used tools, checked against their own pages:
Read honestly, the table says this: if you have exactly two images and want the simplest possible form, PineTools does that. ImageCombiner is the closest match to this image merger — free, local, no account — and it adds free placement. Kapwing is a full online editor, and its free plan marks exports with a watermark.
Where this image merger differs is the overlay layout for layering one image on another, before-and-after labels drawn into the file, a layout picked automatically from your images, and a higher ceiling for very large merges. The trade-off is the daily limit on exports above 2,400 pixels, explained below.
Resolution, file size and quality
An image merger can only output the detail its inputs hold, and then only as much as you let it keep. The Max width setting in the export panel caps the width of the merged file — Original, 3000, 2000, 1200 or 800 pixels — and the height follows from the layout. Max width only ever shrinks the result; it never enlarges past the merged size, because enlarging adds file size and no detail.
Two 12-megapixel phone photos (4032 × 3024) merged side by side
Max width
Merged size (approx.)
Megapixels
Free export?
Good for
Original
8,064 × 3,024
24.4 MP
Full size: 3 a day free
Print, archive, cropping later
3000 px
3,000 × 1,125
3.4 MP
Full size: 3 a day free
Large screens, zooming in
2000 px
2,000 × 750
1.5 MP
Yes, unlimited
Web pages, documents, most social posts
1200 px
1,200 × 450
0.54 MP
Yes, unlimited
Upload forms, listings, email
800 px
800 × 300
0.24 MP
Yes, unlimited
Chat apps, quick previews
Sizes ignore the gap and border, which add a few pixels. "Full size" means a long edge above 2,400 pixels.
Pixel count is what drives file size, and it grows with the square of the width: halve the width and the file holds a quarter of the pixels. That is why lowering Max width is the first thing to try when an upload form rejects a merged image as too large, before touching JPG quality.
Exports up to 2,400 pixels on the long edge are free and unlimited. Above that, three full-size exports a day are free; later ones still download, scaled to 2,400 pixels, and PhotoMerge Pro removes the daily limit. Separately, this merger caps any export at 16,000 pixels per side and 96 megapixels so the browser does not run out of memory, browsers set their own ceiling on top. Chrome allows a canvas of about 268 megapixels. Safari on iPhone and iPad allowed only 16.7 megapixels until iOS 18 raised it to about 67 megapixels, so a full-size merge of two phone photos can fail on an older iPhone — choose 3000 or 2000 as Max width and it will save.
The same two-photo merge at four maximum widths, drawn to scale. The dashed line is the free 2,400-pixel limit.
Choosing the format for a merged image
JPG for merged photographs. The quality slider defaults to 92, which is visually clean; drop it toward 80 only if a site enforces a size cap after you have already lowered the width.
PNG for screenshots, diagrams and anything with text, and the only sensible choice when you need transparency. Tick Transparent background and the gaps and corners stay see-through; transparent areas inside a PNG you added stay transparent too. JPG has no transparency, so the same areas turn into the background colour.
WebP for a smaller file at similar quality when you know the destination accepts it. It also keeps transparency.
When the image merger is the wrong tool
The images overlap and show one scene. Merging puts complete images next to each other; it cannot hide a seam between two halves of a view. That needs feature matching and blending — use Stitch Two Photos Together.
You want one image to show through another. The overlay layout here handles position and opacity. For blend modes such as Multiply and Screen, and for a quick way to swap which layer is on top, use Image Mix.
You have twenty before-and-after pairs, not one. Running the merger twenty times works, but Batch Compare applies one layout and set of labels to every pair at once.
It is a big set of photos for one post. The merger handles it, but the Image Combiner page opens in a no-crop grid and covers column counts and platform sizes.
Image merger — questions
Is this image merger free?
Yes. Merging and downloading are free, with no watermark and no account. Exports up to 2,400 pixels on the long edge are unlimited; above that, three full-size exports a day are free, and later ones still download at 2,400 pixels. PhotoMerge Pro removes the daily limit.
Can it merge more than two images?
Yes. There is no fixed number. Two or three images usually go side by side; four or more are arranged as a grid automatically, and you can switch to a single row or column. The practical limit is your device's memory.
Does it merge images vertically as well as horizontally?
Yes. Pick Vertical to stack images top to bottom at an equal width, or Horizontal to place them side by side at an equal height. Tall screenshots are stacked automatically.
Will merging images reduce their quality?
Merging itself does not add compression: each image is decoded once and the merged result is encoded once. Quality only drops if you lower the maximum width, choose a low JPG quality, or mix very different sizes, where the smaller image limits the shared height.
Can I merge pictures on my phone?
Yes. The image merger works in current mobile browsers on iPhone and Android. You can pick from the photo library, merge, and save the result to the device. Phones have less memory, so set a smaller maximum width if a large merge struggles.
Are my images uploaded?
No. Decoding, merging and encoding all happen in your browser. Anonymous interface events such as the chosen layout are counted for analytics; image pixels and filenames are never sent.
Can it merge PNG images with transparency?
Yes. Transparent areas of a PNG are kept when you export as PNG or WebP. Tick Transparent background to make the gaps see-through too. JPG has no transparency, so transparent areas become the background colour.