Combine Images

When images sit side by side, their heights have to agree; when they are stacked, their widths do. The three matching options decide which height or width wins.

Spacing and the outer border are added on top in real pixels. In the example, Keep sizes with 20 pixels of spacing and a 20-pixel border came to 3680 x 1240: three widths of 1200 + 800 + 1600, two gaps of 20 and two border edges of 20.

Match smallest is the safe default. Big images are scaled down, nothing is enlarged, so nothing gets blurry. Use it for before and after photos, product shots, and anything going on a website.

Match largest keeps every pixel of the biggest image, at the cost of enlarging the small ones. That is right when one image is the important one and the others are small additions, or when the final file is going to print and you want the most resolution available.

Keep sizes never resamples anything. Use it for screenshots you want to show at true pixel size, such as two app screens of different heights, or for pixel art where scaling would smear the edges.

• A thin colored line between images. Spacing is above 0 and the background shows through. Set Spacing to 0px for images that touch.
• One image looks soft or blocky. It was enlarged by Match largest. Switch to Match smallest, or replace it with a larger original.
• Black areas in a JPG where a PNG was transparent. That does not happen here: transparent areas are filled with the background color you picked. If you want to keep transparency, save as PNG or WebP and switch on Transparent.
• The result is scaled to a percentage. The note under the preview appears when the joined image would be wider or taller than 16,000 pixels or larger than 120 megapixels. Browsers refuse canvases much bigger than that, so the whole result is reduced evenly to fit. Join fewer images or use Match smallest.
• The order is wrong. Use the up and down arrows in the list. The first image in the list is on the left (or top).
• An iPhone photo shows sideways. The browser applies the rotation stored in the photo, so this is rare. If it happens, fix the photo first in Rotate and Flip Image.

JPG is the smallest for photos and works everywhere, saved at a quality of 92 out of 100. PNG is lossless and the better choice for screenshots with text, but files of photos are several times larger. WebP sits in between and keeps transparency, but some older programs cannot open it. If the result is too big for an upload form, compress it afterwards with Compress Image or shrink its dimensions with Resize Image.

The saved image does not carry over camera details or GPS location from the originals. It is a new picture drawn from the pixels.

This tool keeps each image whole and lines them up in one row or one column. If you want a grid, a strip with a big photo, rounded corners or a fixed size such as a square post, the Collage Maker crops photos to fill frames instead. If the goal is a document with one image per page, for example scanned receipts to email, Image to PDF is the right tool.