- Get qrencode. It’s in a lot of repositories.
- In a terminal (http://project-hardware.net is just a text example)
echo "http://project-hardware.net" | qrencode -o out.png
- Open out.png with an image viewer and scan it with your barcode scanner on your smartphone
Fully sufficient for small texts. For storage limits take a look at: https://en.wikipedia.org/wiki/QR_code#Storage