You can easily scan QR codes that are already on your phone

Android and iOS both have built-in tools to easily open QR codes from screenshots.
Android Authority

Google starts rolling out QR code-based Quick Share transfers between Android and iPhone

Google has started rolling out a new Quick Share feature that lets Android users share files with iPhones using QR codes. iPhone users can scan the QR code through the Camera app, after which the file ...
Stuff on MSN

How to scan a QR code on iPhone and Android

You’ll be a scanner in no time with this guide to getting the all-conquering QR codes ...
9to5google

Google prepares a new look for Android’s built-in QR code scanner

Android has a built-in QR code scanner tool that you might not even know about, but Google is in the process of giving it a redesigned look. Back in Android 13, Google added support for a built-in QR ...