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Why are QR Codes with capital letters smaller than QR codes with lower case?
Take a look at these two QR codes. Scan them if you like, I promise there's nothing dodgy in them. Left is upper-case HTTPS://EDENT.TEL/ and right is lower-case https://edent.tel/ You can clearly see that the one on the left is a "smaller" QR as it has fewer bits of data in it. Both go to the same URl, the only difference is the casing. What's going on? Your first thought might be that there's a different level of error-correction. QR codes can have increasing levels of redundancy i…
You might have noticed that they both end with the same sequence: ec 11 Those are "padding bytes" because the data needs to completely fill the QR code. TypeHEXBINSplitUPPER 20 9300100000 100100110010 000010010011 lower 41 2601000001 001001100100 000100100110 The UPPER code is 0010 which indicates it is Alphanumeric - the standard says the next 9 bits show the length of data. If you want the smallest possible physical size for a QR code which contains a URl, make sure the text is all in capital letters.
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