How to stitch images vertically or horizontally

Tested example: one landscape and one portrait image

The first source is 400 × 200 pixels; the second is 200 × 400. We used a 200-pixel shared edge and a 16-pixel gap. The same pair produces different canvas dimensions depending on the direction.

For a vertical result, add the scaled heights and the gaps. For a horizontal result, add the scaled widths and the gaps. Two pictures have one gap; five pictures have four. Spacing is inserted between pictures, with no extra outside border.

Choose a direction based on how the result will be read

Vertical stitching suits a sequence that should be read from top to bottom, such as several instruction panels. Horizontal stitching works for a side-by-side comparison with a clear left-to-right order. Check the destination’s preview area: a very wide strip can be displayed too small on a phone, while a long vertical result may be clipped by a social feed.

This tool puts pictures next to one another. It does not detect overlapping screenshot content, remove repeated headers or align a panorama. Crop away unwanted overlap in an editor first if you need a continuous-looking page. It also does not create a multi-row collage grid.

Use a shared edge that keeps the smallest source readable

In vertical mode, shared width controls every picture’s width. Each height follows from that picture’s original proportions. In horizontal mode the reverse applies: the shared height is fixed, and widths vary. A portrait image may therefore occupy much more vertical space than a landscape image in the same stack.

Choosing a shared edge larger than a source can enlarge that source. Enlarging small text does not recover detail, so inspect the smallest screenshot before exporting a full sequence. For a comparison, keep similar subjects at comparable scales in the original images when possible; matching image edges alone does not guarantee matching subject sizes.

Choose spacing and background together

Set spacing to 0 for directly touching edges. A modest gap separates independent panels and makes their boundaries easier to see. The background color appears in those gaps and behind transparent parts of the sources. It does not add a margin around the outside of the finished image.

For transparent gaps, choose PNG or WebP and enable Transparent background. JPG cannot store transparency, so it uses the selected color instead. If you need to add a frame, labels or annotations around the combined result, download it and finish those additions in an editor.

Keep a long image within the output limits

The finished image must be no more than 8192 pixels on either side and no more than 16 megapixels in total. A batch of individually acceptable pictures can exceed those limits when combined. Reduce the shared width or height, reduce spacing, or split a long sequence into two outputs.

You can select 2–20 pictures. Each source is limited to 50 MB and 40 megapixels, and all selected files together must fit within 200 MB. Animated inputs become still images. If the final image also needs to meet a KB limit, download it and select it in the compressor; stitching itself has no target-KB setting.

Frequently asked questions