You can easily resize or print a QR code. To do this, take the QR code and add an 's' and an '=' sign followed by the pixel size.

http://bit.ly/elsBqs.qrcode?s=700

and to create a small QR code:

http://bit.ly/elsBqs.qrcode?s=75

To find out more info about how to create a QR code, check out our API doc:

http://dev.bitly.com/qr_codes.html