There are two ways to get one long screenshot: capture a scrolling screenshot in the first place, or take several ordinary screenshots and stitch them together afterwards. Scrolling capture is easier when it's available, but many apps don't support it.
Option 1: scrolling screenshots built into your device
| Device | How | Limitation |
|---|---|---|
| iPhone / iPad | Take a screenshot in Safari, tap the preview, then choose Full Page | Web pages in Safari only (and a few other apps). Saves a PDF, not an image. |
| Android (Pixel, 12+) | Take a screenshot, then tap Capture more | Only in apps that support scrolling capture |
| Samsung Galaxy | Take a screenshot, then tap the scroll capture arrows in the toolbar | Same — not every app scrolls |
| Mac | No built-in scrolling capture. Use Safari's Export as PDF, or stitch screenshots. | — |
| Windows | Snipping Tool captures one screen. Edge's Web capture → Capture full page works for web pages. | Web pages only |
Built-in capture usually fails for chat apps, social apps, and anything inside a web app. Those are exactly the screenshots people most often need to share.
Option 2: stitch ordinary screenshots
- Take overlapping screenshots. Scroll about three-quarters of a screen each time, so every shot shares a few lines with the previous one. Then nothing is missed.
- Crop the overlaps. Trim each screenshot so the next one starts right where the last ended. Your phone's photo editor is fine for this. Also crop the status bar and keyboard from every shot except the first, or they'll repeat down the image.
- Stack them. Drop them into the image stitcher, choose Top → bottom and Smallest, and set the gap to 0.
- Export as PNG. It keeps text sharp. JPG smears small text.
Privacy: watch where you stitch
Screenshots tend to contain private things: messages, names, phone numbers, bank details, order numbers. Many online "image combiner" sites upload your files to a server to process them.
The stitcher on collage.tools runs entirely in your browser, and the screenshots are never uploaded. You can confirm it by turning on airplane mode once the page has loaded: it keeps working. Before sharing, still blur or cover anything sensitive, because the stitched image contains everything the screenshots did.
How long can a stitched image be?
Browsers can only export images up to a certain size: about 16,384 px on the longest side, and on iPhone roughly 16.7 megapixels in total. For phone screenshots (about 1080–1290 px wide), that's around 13,000–15,000 px tall, or 5–7 full screens.
Past that, the stitcher scales the export down to fit and shows the final size before you download. For very long threads, make two or three images instead of one: they'll be easier to read on a phone anyway.