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Creating a QR Code step by step

(www.nayuki.io)
246 points D4Ha | 3 comments | 17 Nov 24 18:26 UTC | HN request time: 0s | source
1. slig ◴[17 Nov 24 23:03 UTC] No.42168146[source]▶
This resource is awesome. I wanted to have the smallest readable QR code for my printables pages footer [1], and I discovered there that it's possible to encode URLs in "Alphanumeric mode", version 1, using only uppercase characters, e.g., HTTPS://FOO.CC/ABCDEFGHIJ, so I got a three letter domain name and built the simplest URL shortener hosted on a CF worker.

[1]: https://pdf.ahaprintables.com/pdf/preview/aha/zebra-puzzles-... (PDF)

replies(1): >>42169593 #
2. davchana ◴[18 Nov 24 03:56 UTC] No.42169593[source]▶
Would you please share more information about it? Thanks.
replies(1): >>42171204 #
3. slig ◴[18 Nov 24 10:24 UTC] No.42171204[source]▶
The URL shortener only use uppercase letters for the path of the URL, the domain and protocol are not case sensitive. Modern phones can read such QR code easily and identify them as URL.