Short-QR.com is the easiest way to convert long links into a QR code. It works like a typical URL shortener, but additionally generates a QR code for you. So you can quickly copy a long link from the desktop to your smartphone to send it to your friends, without the hassle of long tap. No registration required and completely free.
If you want to scan a QR code, you need a QR code scanner app for your mobile device. You'll get a free app in the Google Play Store or in Apple's App Store.
Deutsch, English