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The QR Code Tool btn_tools_qr in Write > Insert Object inserts a graphical QR code containing text or hyperlinks. These can be scanned by QR code readers in smartphones with cameras, which will then display the text, open the link in phone's browser or create an email with the phone's mail client. This can be very useful in printed material, enabling you to provide live links to web pages or for feedback or a way of directly copying text to the growing number of users with smartphones.

For example, the first QR code below links to a web page, the second one sends an email: