Drag the four corners onto the corners of the page, then press Flatten.
Finish
The photo is processed on your device and never uploaded. Best results: fill the frame with the page, avoid harsh shadows, and place the corners precisely — the straightening follows your corners exactly. "Black & white" is best for text documents; use Color for photos or stamps. The PDF contains this one page; for multi-page documents, scan each page and combine them with PDF merge. Everything runs on your device.