QR code is a 2-dimensional barcode developed in 1994 and has become quite popular. Essentially a block of text is transformed into a square image of dots. Various scanners and barcode readers, including most modern smartphones such as Android and iPhone, can decode a QR barcode back to the original text. QR is an abbreviation of "Quick Response". More about QR code on Wikipedia.
This page allows you to generate a QR code from arbitrary text. The generated barcode can then be downloaded as an image file, or be referenced on this host. Note that the barcode image files on this server may be deleted after a period of time due to storage and bandwidth considerations.
On this page, you can also scan an arbitrary QR Code by clicking the scan button to view its raw text. Permission to access your camera will be needed, obviously.
Your privacy is respected here. An image file with a complex name to protect your privacy is created when generating a QR Code. Other than storing the image for some period, nothing generated or scanned here is analyzed, processed, or peeked at.