QR codes are everywhere, tantalizing us with hidden information. Of course, a few of them are portals to malware or other uncool business, so it's not a good idea to just scan them all and hope ...

And under ‘Free text’ you can encode any combination of text; for example, you could encode a brief note along with a hyperlink. The remaining three options are for decoding QR codes.

Maybe [Luke Skywalker] would enjoy learning to decode QR Codes by hand, too. While it might not be very practical, it would be a good party trick — assuming, like us, you party with nerds.

QR codes can carry text like URLs, vCard contact information, URIs to send metadata to apps, or a link to compose a text or email message. You can read these codes via the camera on a smartphone ...