Capture a Whole Scrolling Page with AldooSnap Scroll Snap
AldooSnap's Scroll Snap stitches a scrolled page, chat log, or long document into one tall image — no more piecing together a dozen separate screenshots. It lives under the menu bar icon, in the Image submenu, and the finished image ends up in the same Recordings folder as every other capture.
How Scroll Snap Works
Once it's running, Scroll Snap grabs frames of your chosen rectangle several times a second and lines up matching rows between them, appending only the new content as you scroll — so the result is one continuous image of everything you scrolled through, not a series of stitched screenshots with visible seams.
As a safety net against runaway memory on very long pages, a capture automatically finishes once the stitched image reaches roughly 30,000 pixels tall.
Capture a Scrolling Page
- Click the AldooSnap icon in the menu bar.
- Choose Image → Scroll Snap.
- The first time, grant macOS's screen recording permission if prompted.
- The screen freezes. Drag to draw a rectangle over the scrollable content you want to capture.
- Adjust the selection handles if you need to resize or reposition the rectangle, or open the Aspect Ratio & Size tool to set exact dimensions.
- Note: exclude any static, non-scrollable parts of the screen from the rectangle — fixed navbars, sidebars, or toolbars — since Scroll Snap stitches frames by matching vertical movement, and static content sitting inside the rectangle throws off that match.
- Click Start scroll capture in the selection bar.
- A control bar appears near the rectangle showing a Scroll to capture hint and a live pixel-height counter.
- Scroll through the content underneath the rectangle at a normal pace — the page underneath scrolls normally, and Scroll Snap keeps appending what comes into view.
- Click Finish Scroll Snap when you reach the end, or Cancel to discard the capture. If you keep scrolling past the ~30,000px safety limit, AldooSnap finishes the capture for you automatically.
- The stitched image opens in the preview window, with the same annotate, share, clipboard, and save tools as any other image capture: Pen, Highlighter, Line, Arrow, Rectangle, Numbered step, and Text tools, Undo last annotation, Zoom in / Zoom out, an Extract color palette button, and an eyedropper.
- Finish with Copy share link, Copy to clipboard, or Save — or Close to dismiss without saving.
Finding Your Captures
Every capture, scrolling or not, saves to the same place. Click the AldooSnap icon in the menu bar and choose Recordings to open the folder directly in Finder.