Scan, a handy little app that brings your phone's camera to bear on QR code and other unique identifiers.

The best part is that it's completely free to download. Once you've got it installed on your device, you'll be able to scan all the codes you want, without having to pay a penny for the experience.

There are a few things to know about QR scanners, but these basic details will be more than enough to get you up and running with QR Droid.

You'll need a phone with a built-in camera and an internet connection to scan QR codes, but you can download the app onto any device. There's nothing special about your device - you can use your tablet or laptop, for example - as long as it has a built-in camera and an internet connection.

In order to scan codes you'll need to point your camera at the QR code you want to scan. This won't be difficult for you to do, as QR Droid will make it a breeze to get up and running.

After you've found the code you want to scan, you'll be able to save it for later. You can either save it to your phone or you can email it or print it.

QR Droid will save all the codes for you, which is extremely helpful, especially if you're trying to keep track of the codes you scan.