If possible, add a tool for converting letters to upper and lower case

[riceshowerX]

For instance, one-click conversion functions include options for converting text to all uppercase, all lowercase, capitalizing the first letter of words, capitalizing the first letter of sentences, and so forth.

[CorentinTh]

Hi, thank you for taking time to make an issue 🙏
Such tool already exists on it-tools : https://it-tools.tech/case-converter