QR Code Field

A QR code (short for "quick response" code) is a type of barcode that contains a matrix of dots. It can be scanned using a QR scanner or a smartphone with built-in camera. Once scanned, software on the device converts the dots within the code into numbers or a string of characters. For example, scanning a QR code with your phone might open a URL in your phone's web browser.

All browsers will let you display a QR Code. What you need to scan them is either a mobile device with an app that can read the QR Codes or a browser extension which can do the same thing from inside the browser.

People often ask how big or small (physically) a QR Code can be, well the simple answer is that there are no limits, a QR Code doesn’t have to be a set size and can be printed to any required size. The surface area of a QR Code is only limited by its environment and expected use combined with the resolution of the scanning device, there isn’t a technical limitation.

Although most QR Codes are black and white, they don't have to be. They can have any color or even multiple colors as long as the contrast between the QR code foreground and background is strong enough. So you can create blue, red, green, color gradient QR codes.

This works because QR code readers look for color contrast to detect a QR code and not for color value. You can also color the white background of the QR code as long as there is enough contast to the foreground color.

QR codes can be used on various mobile device operating systems. There are many free QR code reader for smartphones. However, they differ significantly in terms of usability, scanning speed and standards compliance (in particular regarding the processing of vCards).

The smartphone devices have to support URL redirection, which allows QR codes to send metadata to existing applications on the device.

The QR Code Field uses the API provided by goqr.me which let's us generate QR codes.

There are different barcode standards. In general, barcodes are used as optical machine-readable labels on objects, containing information about the object on which they are glued. The most popular barcode type is used on the product packaging and can be viewed at every grocery store where they make the Universal Product Code machine readable. Because of their omnipresence, the terms “barcode” is often used synonymously for this UPC-A barcode symbol, although there are many other barcode types.