QR Image Scanner lets you scan QR codes from:

- your camera roll
- a saved image
- a webpage
- an email
- a pdf
- a screenshot
- basically anywhere on your device’s screen

PROS

- free
- no ads
- no tracking
- integrated with share sheet (use from Photos, Screenshots, and other apps)

CONS

- only QR codes with URLs supported (for now)

WHY?

In iOS 11 Apple added the ability to scan QR codes from the Camera - just point to scan. There’s even a slick new QR Code Reader for Control Center in iOS 13. But if you want to scan a QR code from your screen (saved image, webpage, email) you need another app.

QR Image Scanner fills this gap until Apple finally adds this feature.