Why are QR codes with uppercase letters smaller than those with lowercase?

In the article, the author explores why QR codes containing capital letters are smaller than those containing lowercase letters. It is explained that the size of a QR code relates directly to the amount of information encoded within it. When uppercase letters are used, the QR encoding system has less information to process, resulting in a smaller code. Additionally, there are differences in data structures generated by uppercase and lowercase letters, which also affect the final size of the code. The author provides practical examples and includes a graphic that illustrates the differences between these two types of QR codes. The article concludes with a reflection on how the choice of letters can impact our daily interactions with technology.