Scroll Capture

Scroll capture lets you capture content that extends beyond the visible viewport — such as long web pages, documents, or chat histories — by automatically stitching multiple frames together.

How It Works

1. Select a region on the screen to capture.
2. Click the Scroll button in the action toolbar (note: the selected region must be at least 100px tall).
3. A translucent overlay appears, prompting you to scroll the content.
4. Start scrolling the target window — Flashot automatically captures frames as you scroll.
5. A progress pill shows the current frame count and total height.
6. Click the green check button (✓) in the bottom-right corner, or press the scroll capture finish key, to complete the capture.

The captured frames are stitched together into a single tall image, which is then saved or copied.

Scroll Chrome UI

During a scroll session, a "scroll chrome" window appears with:

• Live preview — The captured frames stack vertically with smooth transitions
• Status pill — Shows X frames · Y px at the bottom center
• Finish button — Green check button to end the capture
• Auto-stop — The session automatically finishes if the maximum height is reached

Technical Details

• Frames are captured every few hundred milliseconds as you scroll.
• Each frame is compared against the previous one using a scoring algorithm to detect new content.
• Only frames with sufficient new content are kept (deduplication).
• Frames are stitched by scanning for the optimal seam between overlapping content.
• The scroll stitching uses CPU-based NCC (Normalized Cross-Correlation) scoring for seam detection.

Tips

• Scroll smoothly — Steady, moderate scrolling produces the best stitching results.
• Select the right region — The captured region should cover the content area but exclude fixed headers/footers if possible.
• The minimum selection height is 100px.
• The maximum stitched height depends on available memory and content.