Scan to PDF — Photograph a Document With Your Camera

Because the enhancement estimates the paper's white point from the brightest part of the frame and rescales towards it. That removes the yellow cast of indoor lighting, which a fixed brightness curve cannot do — every room is a different colour.

Camera access needs your permission and a secure context, so it works on https and on localhost but not over plain http. If you refused the prompt, re-allow it from the icon in the address bar. On a desktop with no webcam, use "Add photos" to bring in pictures taken elsewhere — they get the same enhancement.

Document for ordinary printed pages. Greyscale when the page has photographs or shading you want to keep. High contrast for faint pencil, a bad photocopy or a receipt on thermal paper.

Yes — build the PDF here, then run it through OCR PDF. That adds an invisible text layer over these pages so the document becomes searchable without changing how it looks.

Shoot square-on rather than at an angle, fill the dashed guide with the page, and avoid a shadow falling across it. Perspective correction is not applied, so a photo taken at 30 degrees stays at 30 degrees.