An online QR code image generator is an online tool which can generate a QR code image with a given data. It is a type of barcode that can be scanned using any kind of device, such as a smartphone or a tablet, and it can contain various types of data, such as a website URL, a text, a contact information, a location, a calendar event, and more. With this tool, users can easily create their own QR codes and save them in different image formats, such as png, jpg, or gif. It is a useful tool for businesses, as it can be used for promotional purposes, for example, by displaying a QR code which links to a website, or for tracking purposes, by adding a unique ID to the code.
Discontinued is not compatible with newer versions of Firefox, etc.: https://addons.mozilla.org/en-US/firefox/addon/OfflineQR/