How it works
Six text transformations
Choose upper, lower, invert, capitalize words, sentence case or alternating case. Word boundaries use Intl.Segmenter with the fixed English locale. Alternating case starts lowercase and counts only letters with case.
Unicode mappings may expand a character: ß can become SS. Case operations are therefore not guaranteed to be reversible. Sentence mode starts from lowercase and capitalizes after sentence punctuation.
What happens to your input?
This tool does its work on this page. The site does not submit your entries or results or keep a history. However, any script allowed to run on the page could read its fields. Clearing the tool or leaving the page cannot erase clipboard entries, downloads, printouts, or screenshots. It also cannot protect you if your browser or device is compromised. Read the privacy limits.