QR Code
The quick response, or QR, Code is a two-dimensional version of the Barcode able to convey a wide variety of information almost instantly with the scan of a mobile device.
One can encode URLs, Contacts (in vCard format), WiFi-Credentials, Locations or other ASCII data.
Creating QR Codes
You can create QR Codes with qrencode.
Usage: qrencode [-o FILENAME] [OPTION]... [STRING]
Encode input data in a QR Code and save as a PNG image.
| Option | Description |
|---|---|
-o FILENAME, --output=FILENAME | write image to FILENAME. If ’-’ is specified, the result will be output to standard output. |
-r FILENAME, --read-from=FILENAME | read input data from FILENAME. |
-s NUMBER, --size=NUMBER | specify module size in dots (pixels). (default=3) |
-l {LMQH}, --level={LMQH} | specify error correction level from L (lowest) to H (highest). (default=L) |
-m NUMBER, --margin=NUMBER | specify the width of the margins. (default=4) |
-d NUMBER, --dpi=NUMBER | specify the DPI of the generated PNG. (default=72) |
-c, --casesensitive | encode lower-case alphabet characters in 8-bit mode. (default) |
-i, --ignorecase | ignore case distinctions and use only upper-case characters. |