Add QR codes (Quick Response Code) to WordPress using the QR code shortcode. Choose the size of the QR code and the data to encode. QR codes are useful as links or data for mobile devices.
The data to encode. Data can be digits (0-9), alphanumeric characters, binary bytes of data, or Kanji. You cannot mix data types within a QR code. The data must be UTF-8 URL-encoded. Note that URLs have a 2K maximum length, so if you want to encode more than 2K bytes (minus the other URL characters), you will have to send your data using POST.
Measured in pixels. The default 150