The QR code in the initial post only supports up to 271 bytes (version 10, Size = 57x57, EC level L). To make it support the full specs of QR code (version 40, 177x177, 2953 bytes), you have to add more values into its RS_BLOCK_TABLE. Is it possible to generate barcode from a string using c ? Is there any builtin classes for generating barcodes in asp.net? Is it possible to detect a barcode printer connected with a system? I'm trying to generate QR codes on my website. All they have to do is have a URL in them, which a variable on my site will provide. What would be the easiest way to do this? I'm looking for a free to use c library/code to create barcodes. Secifically I need to be able to create QR-Code type barcodes. I'm looking for free to use (Open Source or just Free, etc.) not pay. Reed-Solomon algorithm for a QR code generator Ask Question Asked 8 years, 11 months ago Modified 8 years, 11 months ago My understanding in that a QR Code contains the data that is being read, and it does not require an internet connection to interpret the code. If this is the case, why do I get a different QR Codes. A small project I made allows step-by-step debugging and following the creation of the QRCode and manually changing all the parameters - something no generator on web does. The company I work for has released an open source (Apache License v2) Delphi QR barcode generator called DelphiZXingQRCode. It's a Delphi port of the QR code functionality from the ZXing barcode image processing library. How do you encode a carriage return in a QR barcode (so if I scan it with my android, for instance it will come up) A B C I have tried A~d013B~d013C etc. but it always shows the escape characters. I'm creating QR codes with PHP QR Code (). It works well but now I need a free space for a custom graphic or logo in the center of it.