QR Codes, a tracking code technology which was created in 1994 by Denso<Toyota to keep track of vehicles, is now a standard being used everywhere from websites to magazines, apps or stores.
In the web, considering the mobile devices are used as the barcode reader, QR Codes are usually used as an alternative way to show app download/purchase links, wi-fi passes, mobile version URLs of websites, etc.
I needed to create few of them in the past, used online QR Code generators and I was done in a few minutes.
Online QR Code Generators
QRhacker is a beautifully implemented online QR code generator with many options for creating the QR code we want.
It allows many different input types (text, URL, phone number, VCard and Wi-Fi access) and offers customizations like the roundness of the blocks, their foreground/background colors, using images for them and more. Also, the code can be painted pixel-by-pixel.
Once the QR code is created, it can be downloaded either as an image or PDF.
QR codes have a built-in error-correction mechanism and codes that are slightly morphed can still be recognized correctly.
Unitag makes use of this and allows users to transform QR codes by curving the blocks, adding extra shaped and more.