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Comment by tkuraku | Hacker News Reader

I print out a sheet with some text (including the network SSID and password) and a QR code to connect to the guest wifi using libre office writer. It has a built in qr code generator. The QR code text for a wifi password is here: https://en.m.wikipedia.org/wiki/QR_code#Joining_a_Wi%E2%80%9....

No need for any special third party tools.

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There's also the LaTeX qrcode package, bundled with distributions like TeX Live. Minimal working example reduced from my own template:

  \newcommand*{\SSID}[0]{NETWORK}
  \newcommand*{\PASS}[0]{PASSWORD}
  \documentclass{letter}
  \usepackage{qrcode}
  \begin{document}
  \begin{center}
  \LARGE{``\SSID'' WiFi QR code}
  \qrcode[height=5cm]{WIFI:S:\SSID;T:WPA;P:\PASS;H:false;}
  \end{center}
  \end{document}

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