\documentclass[11pt]{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{pstricks}
\usepackage{pst-barcode}
\begin{document}
\title{QR codes and Barcodes in \LaTeX\ with \texttt{pst-barcode} package}
\date{}
\maketitle
\section{QR code: WWW page}
\begin{pspicture}(25mm,25mm)
\psbarcode{http://www.sharelatex.com}{eclevel=H width=1.0 height=1.0}{qrcode}
\end{pspicture}
\section{QR code: vCard}
\begin{pspicture}(25mm,25mm)
\obeylines
\psbarcode{%
BEGIN:VCARD^^J
VERSION:4.0^^J
N:Smith;John^^J
FN:John Smith^^J
ORG:ShareLatex^^J
URL:http://www.sharelatex.com^^J
EMAIL:john.smith@emails.com^^J
TEL;TYPE=work,voice;VALUE=uri:tel:+44-123-456-789^^J
ADR;TYPE=home;LABEL="Street address, City, Province, Postal-code, Country":Post office box;Extended address;Street address;City;Province;Postal-code;Country^^J
END:VCARD
}{width=1.0 height=1.0}{qrcode}%
\end{pspicture}
\section{Barcode: ISBN number}
\begin{pspicture}(50mm,30mm)
\psbarcode{978-3-86541-114}{includetext}{isbn}
\end{pspicture}
\section{Barcode: simple text}
\begin{pspicture}(50mm,30mm)
\psbarcode{Hello world}{includetext}{code128}
\end{pspicture}
\vspace{3em}
Important notes:
\begin{itemize}
\item compilation must be: \texttt{latex + dvips + ps2pdf} (due to using \texttt{pstricks})
\item \texttt{eclevel} parameter specifies the level of error correction, and is one of L, M, Q, H (low to high)
\item \texttt{includetext} parameter enable human readable text
\end{itemize}
\end{document}
