Case Converter
Convert your text to uppercase, lowercase, title case, sentence case, and more.
Free Online Case Converter
The Toolts Case Converter transforms your text between different letter cases instantly. Whether you need to fix accidentally typed caps lock text, format a headline, or standardize the case of a document, this tool handles it in a single click. Everything runs in your browser — your text is never sent anywhere.
Available Case Conversions
Sentence case capitalizes the first letter of each sentence and lowercases everything else. This is the standard writing format for paragraphs, emails, and most everyday text. It is the default style for academic papers, articles, and general correspondence.
lowercase converts every letter to its lowercase form. This is useful for normalizing data, preparing text for case-insensitive comparisons in code, or formatting usernames and URLs that require all-lowercase input.
UPPERCASE converts every letter to capitals. Common uses include headings in legal documents, product labels, acronyms, and any situation where emphasis or formality is required. Note that in digital communication, extended uppercase is often interpreted as shouting.
Title Case capitalizes the first letter of each major word while keeping minor words like articles, prepositions, and conjunctions lowercase (unless they begin the title). This follows standard English title conventions and is used for book titles, article headlines, and presentation slides.
tOGGLE cASE inverts the current case of each letter. Uppercase becomes lowercase and vice versa. This is particularly useful for correcting text that was accidentally typed with caps lock enabled.
aLtErNaTiNg CaSe alternates between lowercase and uppercase for each letter. This style is commonly used in internet culture, particularly associated with the SpongeBob mocking meme, to convey sarcasm or irony.
When to Use Each Case
For professional writing, sentence case and title case are the most commonly used. Sentence case is appropriate for body text, emails, and general writing. Title case is standard for headlines, book titles, and headings in formal documents. Lowercase is frequently used in programming contexts, URLs, and informal digital communication. Uppercase serves well for acronyms, abbreviations, and short emphasis text like labels or buttons.