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technology/tools/QR Code.md
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---
obj: concept
wiki: https://en.wikipedia.org/wiki/QR_code
rev: 2024-03-13
---
# 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](../internet/URL.md), Contacts (in [vCard](../files/vCard.md) format), WiFi-Credentials, Locations or other [ASCII](../files/ASCII.md) data.
One can encode [URLs](../internet/URL.md), Contacts (in [vCard](../files/vCard.md) format), WiFi-Credentials, Locations or other [ASCII](../files/ASCII.md) 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](../files/media/image/PNG.md) 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](../files/media/image/PNG.md). (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. |