How ez-QR Works
What's a QR code?
A QR Code (it stands for "Quick Response") is a mobile phone readable barcode that's been big in Japan forever, broke into Europe a while back, and is now getting traction in USA.
In its simplest sense think "print based hypertext link" - simply encode a URL into the QR Code and then point a mobile phone (or other camera-enabled mobile) at it. If the device has had QR Code decoding software installed on it, it will fire up its browser and go straight to that URL.
But it doesn't stop there - a QR Code can also contain a phone number, an SMS message, V-Card data or just plain alphanumeric text, and the scanning device will respond by opening up the correct application to handle the encoded data appropriately courtesy of the FNC1 Application Identifiers that are embedded in the encoded data.
The technical specifications for a QR Code are set down in the ISO-18004 standard so they are the same all over the world, and the only significant variations from one QR code to another (apart from the data it contains) is the number of modules required to store the data. A Version 1 QR Code is a 21x21 array of data elements with the array increasing in size by 4 modules for each increase in version number. The largest standard QR Code is a Version 40 symbol that 177x177 modules in size and can hold up 4296 characters of alphanumeric data (theoretically) compared to 25 characters for a Version 1 QR Code.
While there is still a lot of scope for improvement, the resolution of average present-day camera-enabled portable devices is such that the size of the data modules (dots) on a QR Code of Version 5 or above (37x37) presents a real risk of incorrect decoding of the symbol by the device. When creating a QR Code intended for use with mobile phones and PDA's it's best to stick to Version 4 or lower, and a QR Code symbol of at least 2cm (0.85inches) across.
To make things a bit more robust, the QR Code also contains its own error correction data, internal orientation calibration and self-alignment markers. In this way it doesn't matter whether the QR code is upside down or wrapped around a curved surface, the message will still get through.
For more information about QR Codes, try these sites:
- Denso-Wave - They invented the things in the first place!!
- QRMe - Home base for everything you need to know about QR
- Wikipedia - QR Codes
- QR-Code - Jordi and the boys blogging about QR Codes
What's all this about?
Print QR Codes
Generate printable QR mobile phone-readable 2D barcodes containing a website URL, an email address, a phone number, a pre-formatted SMS message or just plain text to use as a:
- Paper Prints
- DIY Stickers
- Temporary tattoos
- Iron-on T-shirt transfers
Design A Custom QR Code T-Shirt
Generate your own QR Code and then you and your code are sent to the Zazzle print-on-demand website to complete the selection of your shirt style, size and color for immediate purchase, printing and delivery direct to your door.
Create Hi-Res QR Code Artwork
Make as many high resolution artwork quality QR Codes as you want for one low monthly subscription fee.
Once you have opened an account you will be able to generate QR Codes at sizes up to 3000 pixels across and at your choice of 72dpi, 150dpi or 300dpi.
Image files are generated in either PNG or PDF format and can downloaded immediately, or emailed to an email address.
Just the thing for graphic designers and others who need high quality QR Code artwork files for print design work.
Also includes history reporting, re-editable destination URL's, optional short URL or native URL and the ability to attach a phone number to the QR code.
Sign up to generate as many codes as you want for just $11.95 per month (lower rates for longer periods).