Uppercase Converter

In short Converting to uppercase maps every lowercase letter to its capital and leaves numbers, punctuation, spacing and line breaks exactly as they were. It is the simplest text transformation there is, and it has two non-obvious cases. The German ß has no single-character capital in ordinary use and conventionally becomes SS, so a round trip back to lowercase does not return the original. And Turkish has two distinct i letters — dotted and dotless — so uppercasing "i" correctly gives İ in Turkish and I everywhere else, which is a genuine source of bugs in software that uppercases text before comparing it. For ordinary English neither applies. The practical uses are headings where the design calls for capitals, filling in forms that demand block capitals, and normalising data before comparison. That last one is worth a warning: uppercasing to compare is fine, but storing the uppercased version destroys the original casing permanently. Keep the text as typed and uppercase only for the comparison itself.