Lowercase Converter

Converting to lowercase changes every capital letter to its small form, including accented characters, while leaving numbers, punctuation and spacing untouched. It's the mirror of an uppercase conversion but is used for a different set of tasks, most of which involve normalizing text rather than changing how it looks for a reader.

A common use is preparing text for comparison or deduplication: two entries like Email@Example.com and email@example.com are the same address, but a case-sensitive check treats them as different strings unless both are lowercased first. The same logic applies to matching tags, slugs, filenames and search terms, where lowercase is often the expected format. It's also handy for toning down text that was typed or pasted in with the caps lock on.

One caveat is that lowercasing indiscriminately removes meaningful capitalization: proper nouns, the pronoun I, and acronyms like USA or NASA all get flattened to lowercase along with everything else, so lowercased text intended for publishing usually needs a manual pass to restore those.