Combine Images

Resize your images first. This is the one that matters.

The advice that decides whether your result looks deliberate or broken, and almost nobody mentions it.

Nothing is scaled to match. Each image is placed at its own size, and the canvas is made big enough for the largest one. So:

Side by side, the canvas is as tall as your tallest image, and shorter ones are centred vertically with background above and below them.

Stacked, the canvas is as wide as your widest image, and narrower ones are centred with background either side.

If your images are already the same size — two screenshots from the same phone, frames from one video, photos straight out of one camera — this is exactly right and you will never notice. If they are not, you get bands. Combine a 4000-pixel photo with a 500-pixel one and the small image becomes a stamp floating in a sea of background.

The fix takes one extra step: run them through Resize Image to a common height before combining side by side, or a common width before stacking. Then the join is seamless. It is worth the extra minute, and it is the difference between the two outcomes.

If the sizes are close but not identical — say 1920 and 1880 wide — the band will be thin enough to read as a deliberate margin, especially with the background set to white or black.

Order is the job, so drag the frames

Each image you add gets its own frame below the options, and the visual order of those frames is the order they are stitched in — not the order you happened to select the files.

That matters more than it sounds. A before-and-after pair in the wrong order says the opposite of what you meant. A sequence of screenshots showing steps has to run in step order. Most mergers take whatever order the file picker handed them, which is often alphabetical and therefore wrong.

Drag a frame to move it. On a phone, drag its number badge instead — reordering works on touch, which is unusual for a tool like this. Each frame also has a rotate control and a remove control, so a single sideways photo in the set can be fixed in place without leaving the page and coming back.

The rotation is baked in before stitching, so what you see in the frames is what gets combined.

Gap and background: small settings, large effect

Gap runs from 0 to 50 pixels and starts at 10.

Set it to 0 for a continuous panorama, a long screenshot split into parts, or anything meant to read as a single image. Any gap at all breaks the illusion.

Use 10 to 20 for a comparison — a before and after, two product options, a pair of charts — because a visible gap is what tells the viewer these are two separate things rather than one wide picture.

Go higher for a deliberate framed look, particularly with a white background.

Background fills the gaps and any bands. White suits screenshots, documents and product shots. Black suits photographs and anything going on a dark background. And because the background is painted before the images, a transparent PNG comes out over your chosen colour rather than turning black — which is a common failure elsewhere.

What to know about grid mode

Grid arranges the images in roughly a square — the number of columns is worked out from how many images you have, and it is not adjustable. Three images give you a two-by-two with one empty space, five give a three-by-two with one empty. The empty space takes the background colour.

Two honest notes about grid specifically.

Every cell is sized to the largest image in the set, and in grid mode a smaller image sits in the top-left of its cell rather than being centred. Side by side and stacked both centre; grid does not. So grid is the mode where matching your image sizes beforehand matters most — with equal sizes it is perfect, and with mixed sizes it looks misaligned rather than merely banded.

If you want a properly composed multi-image layout with individual control over each slot, Collage Maker is built for that, with per-slot drag and zoom. Grid here is for the quick case where the images already match.

The output

You need at least two images; one gets a clear message rather than a confusing result. A preview of the finished composite appears before you download, so you can adjust the order, gap or background and look again.

The result is a JPEG at high quality, named combined.jpg. Two consequences worth knowing: transparency is flattened onto your background colour, and if you are combining PNG screenshots with sharp text the JPEG compression will put a faint haze around the letters. For screenshots with fine text, combine at the largest size you can and avoid a second round of compression afterwards.

Everything happens on your device — no upload, no watermark, no account, no limit beyond what your browser can hold. Images are loaded one at a time rather than all at once, so a long set will not stall.

Related tools

Resize Image is the step to take first when your images are different sizes — it is what makes the join clean. Collage Maker is the better choice for a designed layout with control over each slot. Crop Image trims an image to match its neighbours before combining.