Paste your text and pick a mode - the result appears instantly. The text goes nowhere: the conversion runs in your browser.
A case converter helps when text was typed in all caps and needs to look normal again, when a heading should go all-capitals or, the other way round, all-lowercase. The "iNVERT cASE" mode rescues text typed with Caps Lock accidentally on: hELLO becomes Hello without retyping. "Sentence case" capitalises the first letter of each sentence and lowercases the rest - a quick way to tidy up text written entirely in lowercase. To measure text length, words and sentences, use the separate character and word counter.
Questions and answers
Which case modes are available?
Five: UPPERCASE (all capitals), lowercase (all small), Title Case (every word capitalised), iNVERT cASE (upper and lower swap) and Sentence case (the first letter of each sentence capitalised, the rest lowercase).
What is case inversion for?
Most often, to fix text typed with Caps Lock accidentally on: hELLO becomes Hello. Inversion flips the case of every letter.
Is the text sent to a server?
No. The conversion runs right in your browser in JavaScript; the text is never transmitted or stored anywhere.
Where can I count characters and words?
Counting characters with and without spaces, words, sentences and reading time lives in a separate tool - the character and word counter.