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Can you please explain me How actually QR codes are created and How they are decoded. There are lots of websites and apps that can do the job. Here I have created a QR-code for the character QR12 by the website and this gives the following code :
enter image description here

I have decoded it to verify with the website and this gives the correct result.
I a'm very much interested to know the logic behind this to encode each character which is related to each square block. If I want to create this QR code by hand using pen and white paper, how can I do this. How can I do the reverse process also manually.
Thanks in advance.

Primo Raj
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    please check https://en.wikipedia.org/wiki/QR_code – hakim May 14 '18 at 06:03
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    [Possible duplciate](https://stackoverflow.com/questions/3710937/what-is-the-spec-for-formatting-data-in-qr-codes-i-can-not-find-it-anywhere)? – user202729 May 14 '18 at 06:04
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    This might also help you: https://www.thonky.com/qr-code-tutorial/introduction – Wicky May 14 '18 at 06:06
  • All the above three links are very helpful to understand QR code. – Primo Raj May 14 '18 at 12:32
  • Does this answer your question? [What is the spec for formatting data in QR codes? I can not find it anywhere](https://stackoverflow.com/questions/3710937/what-is-the-spec-for-formatting-data-in-qr-codes-i-can-not-find-it-anywhere) – pppery Jan 02 '21 at 15:14

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