This QR code online generation tool is using the QrCode.Net open source library.
Enhancements are done to automatically optimize the resulting QR code by tuning matrix size and compression level.
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The codes you generated are stored until you exit this website or stay inactive for a long period of time.
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The main usage of QR codes is scanning them on a mobile phone to avoid having to type an URL or phone number.
Read more about QR codes on Wikipedia.
The highest compatibility is achieved by writing a phone number like this: +1 800 4382653. Spaces are optional and meaningless. More details on How to write a phone number by Paul Makepeace.
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