Merge Images Online

How to merge images online

When you need to combine images

Before and after photos. Side-by-side product comparisons. Screenshots stitched together for documentation. Multiple angle shots combined into one shareable image. There are a lot of situations where you need two or more images in a single file.

The usual workarounds are slow. Opening Photoshop or GIMP for something this simple is overkill. PowerPoint tricks work but produce awkward output. Screenshot tools that stitch scrolls are limited to that one use case.

This tool is purpose-built for the task. Drop the images, pick a layout, adjust the gap, download. The whole thing takes about 30 seconds. Everything runs in the browser so your images stay on your device.

The joining is easy, the mismatch is the problem

Placing two pictures next to each other is simple arithmetic. What makes a merged image look wrong is almost always that the two sources disagree, and there are four ways they can.

Different dimensions

Two photos that look the same size on screen are often very different files. In the side by side layout this tool scales every image to the height of the tallest one, which keeps proportions honest. The trade off is that a much smaller image gets enlarged and can look soft, so merging images of a similar size gives the cleanest result.

Different aspect ratios

A 4:3 photo and a 16:9 photo cannot share a row without something giving way. You either crop one, which loses content at the edges, or pad it, which adds bars. Neither is wrong, but choosing deliberately beats letting a tool decide for you.

Different formats and transparency

Merging a PNG that has transparent areas with an opaque JPEG forces a decision about what shows through. This tool saves the merged file as PNG, so transparency can survive if you choose the transparent background. If you later convert the result to JPEG, transparent areas have to be filled, usually with white.

Different colour handling

Photos from two cameras, or one edited and one not, can carry different colour profiles. Side by side, the same white wall looks warm in one half and cool in the other. Nothing is broken, the two files simply describe colour differently, and the join makes a gap obvious that neither photo showed on its own.

Horizontal or vertical, and how to choose

Side by side suits before and after comparisons, two portraits, or anything a reader should scan from left to right. It works badly on phones, where a wide merged image shrinks until neither half is readable.

Stacked suits phone screens, long screenshots, receipts and conversation captures. A stacked pair keeps each image at full width on a narrow screen, which is why almost every screenshot thread you see online is stacked rather than placed side by side.

A practical rule: if the merged image will mostly be seen on a phone, stack it. If it is going into a document or a wide layout, place the images side by side.

Spacing and background colour

A gap between the two images is not decoration. Without one, the eye reads a busy edge as part of the neighbouring picture, especially when both are photographs with detail running right to the border. A few pixels of separation makes the pair read as two images rather than one confusing one.

The colour showing in that gap matters too, and this tool lets you choose white, black or transparent. White looks clean on a white page and becomes an obvious bright band on a dark one. Transparent lets the page behind show through, which suits images that will sit on a coloured background.

FAQ