Joining images into one file solves a specific set of problems. A long web page captured as three overlapping screenshots becomes a single readable image. A before-and-after pair sits side by side where the comparison is obvious. A conversation screenshotted across four phone screens reads as one continuous thread instead of four attachments that have to be opened in order.
The merge normalises sizes so the result looks deliberate. Stacking vertically, every image is scaled to the width of the widest one; joining horizontally, every image is scaled to the height of the tallest. Aspect ratios are always preserved, so nothing is stretched, and the images butt directly against each other with no gaps.
The composite is assembled on a canvas in your browser. Screenshots of private conversations or internal tools are joined locally.
Capture at a consistent width. The strongest factor in how the merge looks is whether your source images share a dimension. Screenshots taken on the same device at the same zoom level stack seamlessly; a mixture of phone and desktop captures will be scaled to match and the smaller ones will look soft.
Watch for overlap. When capturing a long page in sections, most people scroll by slightly less than a full screen, which leaves a repeated band of content between captures. Crop the overlap out of each image before merging — the tool joins them exactly as given and does not detect duplication.
Mind the total size. Six full-height phone screenshots stacked vertically produce a very tall image. The canvas is capped at 8192 pixels on the longest side, and anything beyond that is scaled down to fit, which reduces the sharpness of every panel.
The order you added them. Drop them in sequence, or select them in order in the file dialog, and check the arrangement before applying.
They are scaled to share a dimension — the widest width when stacking vertically, the tallest height when joining horizontally — with aspect ratios preserved. Nothing is stretched or cropped.
No, they butt directly together. To create separation, add a border to each image first with the Add Border tool, then merge.
A single JPG at quality 0.92. Transparency in PNG inputs is composited onto white.
The combined canvas is capped at 8192 pixels on its longest side. Larger compositions are scaled down to fit, which softens every panel — so merge in smaller groups if sharpness matters.
No. The canvas is composed inside your browser and the result written directly to your downloads.