There are lots of QR code generators on the internet but you should look for the most reliable provider to use. For instance, I used this website
https://www.qr-code-generator.com/[/li][/list]
Never use online QR generators. You may fall into counterfeit traps capable to substitute the original bitcoin address or even deliver
[1],
[2] the malicious payload to your machine.
[1]. link 1
[2]. link 2