Some time ago, Google released Goo.gl, their URL-shortener. They called it the “stablest, most secure, and fastest URL shortener on the web.” But it also may be the coolest thanks to an easter egg.
The trick is that if you simply add “.qr” to the end of any goo.gl shortened URL, it will create a QR code. Scanning this with any QR code reader will take you to the URL.
So, for example, this URL: http://goo.gl/jP37N is the shortened link for my homepage. If I make it: http://goo.gl/jP37N.qr , I’ll get the image shown below.
Do Note that Google’s QR code generator is limited to encoding URLs only. If you have other marketing needs such as encoding contact information, or using the QR Code as a dialer, you will have to go elsewhere. There are other limitations: you can not specify levels of error correction, or use other options commonly found in QR code generators, such as the ability to specify display size. This is what you see. For a simple URL, this is just fine.
But these QR codes are great for mobile use, and Google in particular has been using them a lot for things such as easy installation of Android apps.
Next trick is that if you append “.info” to the shortened URL, it will provide you information with respect to the shortened URL like the Long URL, the Traffic data to the URL because of the Shortened URL, the referrers, Visitor Info(including Countries , Browsers and Platforms). Also you can have the same info by appending a “+” at the end.
e.g. http://goo.gl/jP37N.info or http://goo.gl/jP37N+