Case Converter

Convert English text to uppercase, lowercase, title case or sentence case without changing the underlying words.

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Case Converter

Paste English text and choose upper, lower, word initials or sentence initials. Word-initial mode capitalizes each word, preserving internal apostrophes: don’t stop → Don’t Stop. It is not a publisher-specific title style. Review acronyms and proper names; conversion does not correct grammar.

All four buttons apply English casing, whatever the page language. Word initials preserve internal apostrophes and split at hyphens: e-mail → E-Mail; 123abc → 123Abc. Sentence initials accept leading spaces or quotes and letters after . ! ? 。！？, with or without a space. A line break alone does not start a new sentence.

Input is limited to 500000 UTF-16 code units; some emoji count as two units. Unicode casing can expand text, for example ß → SS in uppercase. Results remain plain text and can be copied. Processing runs in this browser; it does not translate, correct grammar or preserve rich formatting.

hELLO wORLD → HELLO WORLD / hello world / Hello World / Hello world
don’t stop → Don’t Stop
e-mail → E-Mail
hello.world → Hello.World

Processing takes place locally in your browser.