QR Codes

There are also online QR code generators, but maybe you don't like to send your private data (like WiFi passwords) to them. Here is how to do this on your computer.

Install QR Code generator

With Arch Linux, you can install qrencode from the extra repository.

If you prefer some GUI software, you can use qr-code-creator from the AUR.

I have written some short instruction how to install software from the AUR.

Create QR-Code to share an URL

qrencode -m 2 -o url.png "http://www.yoursite.org/"

Create QR-Code to share WiFi access data

qrencode -m 2 -o wifi.png "WIFI:S:SSID;T:WPA;P:Password;;"

Creat QR-Code to share a phone number

qrencode -m 2 -o phone.png "tel:+49......."

Typen von QR Codes und Speicherkapazität

Version	Grösse	ECC Level	Data Bits	Numeric	Alphanumeric	8-Bit Binary
1	21x21	L	152	41	25	17
		M	128	34	20	14
		Q	104	27	16	11
		H	72	17	10	7
2	25x25	L	272	77	47	32
		M	224	63	38	26
		Q	176	48	29	20
		H	128	34	20	14
3	29x29	L	440	127	77	53
		M	352	101	61	42
		Q	272	77	47	32
		H	208	58	35	24

Error Correction: Level L = approx 7%, Level M = 15%, Level Q = 25%, Level H = 30%

Alphanumeric: 0-9, A-Z (uppercase only), Space, $, %, *, +, -, /, . and :