This case converter transforms text into capital case, sentence case, lower case, upper case, or title case under AP, APA, MLA, AMA, Chicago, Bluebook, and New York Times rules.
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Capital Case Converter
Convert text to capital, title, sentence, lower, or upper case, with seven title-style rule sets.
Calculator
About this calculator
Formula notes
Capital case uppercases the first letter of every word. Title case keeps eligible small words lowercase except at the start, end, or after a colon; the selected style supplies the small-word list.
Worked examples
- Example: a 6-word heading such as 'the rise and fall of APIs' becomes 'The Rise and Fall of APIs' under Chicago style.
- With 7 title-style choices, the 6-word heading 'a guide to APIs in practice' preserves APIs while applying the selected small-word rules.
How to use it
- Paste or type the source text.
- Choose the target case and, for title case, the editorial style.
- Read or copy the transformed text from the result.
Frequently asked questions
Why do title styles produce different results?
Each style treats articles, conjunctions, and prepositions differently, so the same heading can legitimately vary.
Are existing acronyms preserved?
Runs of two or more uppercase letters, including a trailing lowercase s, are preserved as acronyms.
Limits and interpretation
- The converter applies deterministic casing rules, not a grammar or proper-noun model, so names, brands, scientific notation, and language-specific conventions may still need editing.
- Style manuals contain contextual exceptions beyond a compact small-word list; review high-stakes academic, legal, medical, or publication copy against the current manual.