go-qrcode - 0.0~git20190110.dc11ecd-2+b6 main

A QR Code is a matrix (two-dimensional) barcode. Arbitrary content may
be encoded, with URLs being a popular choice :)
.
Each QR Code contains error recovery information to aid reading damaged
or obscured codes. There are four levels of error recovery: Low, medium,
high and highest. QR Codes with a higher recovery level are more robust
to damage, at the cost of being physically larger.
.
The maximum capacity of a QR Code varies according to the content encoded
and the error recovery level. The maximum capacity is 2,953 bytes, 4,296
alphanumeric characters, 7,089 numeric digits, or a combination of these.