Case converter

Use this case converter to change text to title, sentence, upper or lower case. Create slugs or code styles, then check your language's accents and letters.

Free, no sign-up. Your text stays in your browser and is never uploaded.

Your text stays in your browser and is never uploaded.

Write names and acronyms with the spelling you want. Their words keep that spelling in sentence, title and capitalised case. Up to 100 lines, 128 characters each.

Converted text

Showing Sentence case.

A case converter changes text between sentence, title, upper and lower case, plus slugs and code styles. English titles offer AP, APA, Chicago 18 and MLA small-word rules. Other languages use sentence-style titles. Mark names and acronyms to preserve their spelling, then copy or download the result. Conversion runs locally in your browser.

How to use this tool

Title and sentence case
Sentence case capitalises the first word of each sentence and lowers the rest. English title case offers AP and APA four-letter rules, Chicago 18 five-letter preposition rules, and MLA lowercase prepositions. Articles and conjunctions follow the selected style, unless they start the title, follow a colon or end it. This is a small-word approximation: review grammatical roles, compounds and particles yourself. Words with an inner capital, such as iPhone or SEO, keep their letters.
Language rules
Upper and lower case follow the rules of the language you pick. German ß becomes SS in capitals and stays ss when lowered again. A dotted capital İ lowers to a plain i. Dutch IJ is capitalised as one letter (IJsselmeer), and French and Italian elisions capitalise the word after the apostrophe (L'École). German sentence case keeps the capitals you typed, so nouns stay capitalised.
Slugs and code cases
Slugs use lower case letters, digits and hyphens. Accents are removed, German ä, ö and ü become ae, oe and ue, Danish and Norwegian æ, ø and å become ae, oe and aa, and ß, ł and similar letters become their usual Latin spelling. camelCase, snake_case and kebab-case split words at spaces, punctuation and existing capitals.

Unicode case mapping FAQ

Questions before you start

Title case capitalises the main words: "How to Write a Good Headline". Sentence case capitalises only the first word and names: "How to write a good headline". English style guides differ: Chicago uses title case for titles, while AP uses title case for work titles and often sentence case for headlines. Other languages normally use sentence case.

Articles (a, an, the), short conjunctions (and, but, or, nor, for, so, yet) and short prepositions (as, at, by, in, of, off, on, per, to, up, via) stay lower case inside a title. The first and last words and the word after a colon are always capitalised.

German normally writes ß as SS in capital letters, and that is the standard Unicode mapping. The change cannot be reversed automatically, because lowering SS gives ss. If you need the capital ẞ, which German spelling also allows, type it directly.

Words with a capital after the first letter, such as iPhone, SEO or McDonald, are kept as typed. Names written with an ordinary first capital are lowered in sentence case, except in German, where the capitals you typed stay. Mark names and acronyms with the spelling you want, one per line. Their individual words are protected in sentence, title and capitalised case, including input written entirely in capitals. Up to 100 lines of 128 characters each are used. Uppercase, lowercase and code modes deliberately follow the selected conversion.

No. The conversion runs in your browser, and your text is never uploaded, stored or used for AI. The text area is also left out of our page analytics. Closing or reloading the page clears it.

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