Uppercase to Lowercase Converter

This page does one conversion: it lowercases every letter in the box and leaves digits, spaces, punctuation, symbols and emoji exactly where they were. The output has the same number of characters as the input in almost every case, so line lengths and layout stay intact.

Typed with caps lock on, WELCOME TO THE USA, MR. O’BRIEN comes out as welcome to the usa, mr. o’brien. Notice what went with the capitals: the sentence start, the acronym and both names. Lowercase is a clean starting point, not a finished sentence.

Some text is meant to be lowercase from start to finish. The tool is quickest for these:

• Email addresses and domains. John.Smith@Example.COM becomes john.smith@example.com. Domain names ignore case, so the part after the @ is always safe to lowercase, and in practice the name before the @ is rarely case-sensitive either.
• Lists you plan to deduplicate. Apple, APPLE and apple look like three entries to a strict comparison. Lowercase them first and a duplicate remover sees one.
• Tags, hashtags and keywords where you want a consistent style.
• File names and URL slugs, which on many servers are case-sensitive, so mixing cases creates two different addresses.

Lowercasing follows Unicode's standard case rules, not just the English alphabet:

• Accented capitals convert: ÀÉÎÕÜ becomes àéîõü.
• Greek gets the right sigma for its position. ΟΔΟΣ ΣΟΦΙΑΣ becomes οδος σοφιας, with the word-final form ς at the end of each word and σ at the start.
• Turkish is the exception. The conversion isn't language-aware, so the dotted capital İ becomes i followed by a separate combining dot. İzmir (5 characters) comes out as 6 characters, and the extra dot may show up in some fonts. Check Turkish text by eye.

Lowercasing throws away information you can't recover automatically. If the text is prose, run it through the Sentence Case Converter next to restore capitals at the start of each sentence, then fix names, places and acronyms such as USA or PDF by hand.

Keep a copy of the original before converting anything with lots of proper nouns, such as an address list or a bibliography. Retyping capitals in fifty names takes longer than fixing a few shouted words.