When you just have to put your signature on a real-life document, but you don't have a standalone scanner handy, the easiest ...

Avoid downloading third-party apps to scan QR codes.

WhatsApp is reportedly developing a new feature for Android users that will allow them to scan documents directly within the app, a capability that has been available to iOS users for several months.

A lifetime subscription to this app lets your smartphone handle scanning, editing, and organizing paperwork in seconds.