[KMnO4]

There are bespoke tools for scanning documents with your phone and exporting to PDF. The quality is MUCH better this way, as it automatically crops, aligns, and dewarps the image, plus applies filters to adjust the colours. You would have a hard time differentiating this from a proper scan.

(For example, Microsoft Lens: https://apps.apple.com/ca/app/microsoft-lens-pdf-scanner/id9...)

[growt]

That's true. But in the situation with my accountant that led to me developing this, I already had a bunch of files on my computer. Some were screenshots of emails, some were photos, so this was a handy way to combine them all.