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Long chat threads, step-by-step screenshots and before-and-after pairs all need several images joined into one. Add them in order, choose side by side or stacked, match their sizes if you like, and download a single image without uploading anything.
Processing locally on your device
Overview
Stitching is simpler than a collage: images are placed edge to edge along a single line. Horizontal stitching puts them side by side, which suits comparisons, before-and-after pairs and simple panoramic strips. Vertical stitching stacks them top to bottom, which is ideal for scrolling screenshots, conversation captures and tall infographics. You can add as many images as you like, reorder them by dragging or with the arrow buttons, and remove any of them.
The main decision is how to handle images of different sizes. With size matching on, every image is scaled to the same height for a horizontal strip, or the same width for a vertical stack. You can match to the smallest image, which never enlarges anything, or to the largest, which keeps the biggest image at full detail. With Keep original sizes, nothing is scaled and you choose the alignment: top, center or bottom for horizontal strips, and left, center or right for vertical stacks. The leftover space is filled with your background colour, or left transparent in PNG and WebP.
Very long results run into browser limits. Most browsers can reliably draw a canvas of 16,384 pixels per side, and iPhone and iPad Safari also cap a canvas at about 16.7 megapixels. The stitcher always shows the final dimensions and megapixels. If the full-size result would pass 16,384 px, it warns you and scales the whole export down to fit instead of failing, and it flags results above 16.7 megapixels that may not export on iOS.
Spacing from 0 to 200 px adds an even gap between images in the background colour. The preview is drawn at a reduced size for speed, and the export is rendered again at the final resolution. Choose PNG for screenshots with text, because it is lossless and supports transparency. Choose JPG or WebP with the quality slider for photos where file size matters. Images are decoded with their EXIF orientation applied, so phone photos appear the right way up.
| Direction | Size matching | Typical output | Best for |
|---|---|---|---|
| Horizontal | Same height | Wide strip | Comparisons, before/after, panoramas |
| Vertical | Same width | Tall column | Screenshots, chats, step-by-step guides |
| Horizontal, original sizes | Aligned top, center or bottom | Uneven edges filled with background | Mixed product shots |
| Vertical, original sizes | Aligned left, center or right | Uneven edges filled with background | Mixed-size documents |
Add the images you want to join by dropping them, browsing, or pasting from the clipboard.
Put them in order by dragging the rows or using the up and down arrows.
Choose Side by side or Stacked, then match sizes or keep originals and choose an alignment.
Set the spacing and background colour, or make the background transparent.
Check the final dimensions, pick PNG, JPG or WebP and download the stitched image.
Use cases
Stack several screenshots of a conversation into one tall PNG that is easy to share, attach to a report or archive, with no gaps and the text kept sharp.
Place two photos side by side at matching heights, with a small white gap, to show edits, renovations or progress at the same scale.
Combine screenshots of consecutive steps vertically so readers can follow a whole process in one image in a wiki, README or help article.
Join a few separate shots into a wide banner. Matching heights keeps the horizon line in each frame consistent.
Pro tips
Answers to common questions about the image stitcher.
Stitching joins images along one line, either a row or a column, at their natural proportions. A collage arranges photos in a grid or mosaic inside a fixed frame and crops each one to fill its cell.
No. The stitcher places images edge to edge. Automatic panorama stitching needs feature matching and warping, which is a different process.
There is no limit on the number of images, but the output is capped at 16,384 px per side. If the result would be larger, the whole image is scaled down to fit and you see the final size before downloading.
With size matching, they are all scaled to the same width. With Keep original sizes, they keep their sizes and are aligned left, center or right on the background colour.
Yes, when you export as PNG or WebP. JPG can’t store transparency, so the background colour is used instead.
No. ToolEnhancer processes files on your own device inside the browser. They are never sent to, stored on or seen by our servers.
Yes. The image stitcher is free to use with no sign-up, no watermarks and no daily limits.