Every QR code you generate on this site is absolutely free to use, even for commercial purposes. Please bear in mind that you have to add a trademark sentence if you want to publish the word "QR Code" on any media. You have to indicate that for the word, not for a QR Code pattern. See here the details.
Just fill out the fields and click the generate button to encode your personal QR Code.
The more characters you use the more difficult it is for a reader to scan the code, so test the code carefully after generating.
Use that QR Code Generator and get a QR Code Reader for Android and for iOS here.
QR Codes are (multi) two-dimensional matrix codes. They are able to store much more characters than regular matrix codes which you probably know for example as price labels on products you buy. A maximum of 4,296 alphanumeric characters can be encoded. The content is stored in bright and dark dots. There is also a error correction (ECC) included which makes it possible to scan even broken QR Codes successfully. That ability is often used for including graphical elements like logos into the image. If you are looking for more technical information look here
You can publish it on business cards, clothes e.g. shirts, put it on posters and flyer or print it in magazines. This are the most common places where they are used. If you have another cool place where you plan to place it, let us know.
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One of our most popular QR Code Generator is definately www.qr-code-generator.com There you can find much more information about creating QR Codes with logo and signup for our service with dynamic qr codes.