Image Stitcher (Horizontal / Vertical)

Merges a row or column of images into a single PNG or JPEG. Different from a sprite sheet — this is for making screenshots side-by-side, photo strips, before/after comparisons, or a long scrolling app capture. Pick how to align mismatched-size images (top/middle/bottom for horizontal, left/center/right for vertical), optionally scale them all to the same height/width, and choose a background or keep it transparent. Everything happens in canvas in the browser, no upload.

Alignment only matters because the inputs are rarely the same size, and the choice decides where the leftover space goes. Stitching horizontally without scaling leaves the shorter images floating in a band as tall as the tallest one, and top, middle or bottom decides whether they hang, centre or sit. Scaling to a common height removes the gaps and changes every image's pixel dimensions instead, which is fine for photos and lossy for a screenshot of text.

A before-and-after only reads as a comparison when the two frames are the same size and scale. Two screenshots taken at different window widths, or a photo pair shot from slightly different distances, produce a strip where the eye reads the framing difference as the change. Crop to matching dimensions first; this tool aligns what you give it rather than reconciling it.

A long scrolling capture is the case where the seams show. Consecutive screenshots usually overlap by a few pixels and often carry a sticky header that repeats in every frame, so stitching them end to end reproduces that header down the length of the output. Trimming each piece before stitching is the fix, and this tool does not do the trimming.

The output is one canvas, so its dimensions are the sum along the stitch axis. A dozen phone screenshots stitched vertically make an image several thousand pixels tall, which some viewers downscale to fit and some chat apps re-encode, and either is enough to make the text in it unreadable.