Case Converter

How to use the case converter

1. Type or paste your text into the top box. Line breaks and spacing are kept for the text-style cases.
2. Press one of the eleven buttons. The result appears in the lower box straight away and changes whenever you edit the input or pick another style.
3. Press Copy result, or Use result as input if you want to chain two conversions, for example Title Case first and then kebab-case for a URL slug.

Everything happens in the page. Nothing you type is uploaded, so it is fine for draft headlines, code identifiers and client copy.

The eleven styles explained

How Title Case decides which words to capitalise

Title Case here follows the common newspaper rule. Every word gets a capital except a short list of small words that sit in the middle of a title: a, an, and, as, at, but, by, for, if, in, nor, of, on, or, per, the, to, up, via, vs. The first and last word are always capitalised, so "the end of the road" becomes "The End of the Road" and "what are you looking for" ends with "For".

Style guides differ. AP capitalises words of four letters or more, Chicago lowercases prepositions of any length, and APA capitalises words of four letters or more including prepositions. If your publisher follows one of these closely, use the output as a first pass and adjust the few words that differ. Words already written in capitals inside a sentence, such as NASA, are lowercased first and then capitalised, so retype acronyms afterwards if you need them kept.

Worked example

Start with this text, typed in a hurry:

the quick brown fox jumps over the lazy dog. i love how it reads in a headline

• Sentence case capitalises the first letter after each full stop and the lone "i": The quick brown fox jumps over the lazy dog. I love how it reads in a headline.
• Title Case gives The Quick Brown Fox Jumps Over the Lazy Dog. I Love How It Reads in a Headline. "over" stays capitalised here because it is not on the small-word list, while "the" and "in" stay lowercase.
• snake_case drops punctuation and joins the words: the_quick_brown_fox_jumps_over_the_lazy_dog_i_love_how_it_reads_in_a_headline.
• camelCase gives theQuickBrownFoxJumpsOverTheLazyDogILoveHowItReadsInAHeadline, which shows why very long identifiers need a shorter name.

Splitting words for programming cases

camelCase, PascalCase, snake_case, kebab-case and CONSTANT_CASE first break your text into words. A word ends at a space, a punctuation mark, an underscore, a hyphen, or a lower-to-upper switch inside a word. That is why userID becomes user_id and HTTPServer becomes http_server: the run of capitals followed by a lowercase letter is treated as an acronym plus a word. Digits stay attached to the word they follow, so version2Beta becomes version2_beta.

Accented and non-Latin letters count as letters, so text in French, German, Turkish, Greek or Cyrillic is handled in the same way.

Choosing the right case for the job

• Headlines and titles: Title Case capitalises the main words and keeps short words such as of, the and and small, as most style guides expect.
• Ordinary writing: Sentence case capitalises the first letter of each sentence and is the usual choice for body text and many modern headings.
• Programming: camelCase suits JavaScript variables, PascalCase suits class names, snake_case is common in Python and databases, and kebab-case suits URLs and CSS classes.
• Fixing caps-lock mistakes: paste the text, choose lower case or Sentence case, and copy the corrected version back, which is faster than retyping.
• Emphasis and labels: UPPER CASE is fine for short labels, but long passages in capitals are harder to read, so avoid it for paragraphs.

Whatever you choose, check proper nouns and acronyms afterwards, because a tool cannot know that a word is a name.

Accuracy and limits

Case changes use your browser's Unicode rules. The German ß becomes SS in uppercase, and Turkish dotted and dotless i are not treated specially, so Turkish text may need a manual fix. Sentence case cannot know about proper nouns, so names such as "London" are lowercased and need retyping. Emojis and symbols pass through unchanged.

Frequently asked questions