Case Converter

It rewrites the letter casing of text you paste in without changing the words themselves. Type or paste your text, pick a case from the tabs — UPPERCASE, lowercase, Title Case, Sentence case, and five more — and the result updates instantly. It saves you from manually retyping a heading, a list of names, or a variable name in a different style.

Title Case capitalizes the first letter of every word — "The Quick Brown Fox" — the style used for headings and titles. Sentence case only capitalizes the first letter of each sentence, the way normal prose is written — "The quick brown fox." This tool detects sentence boundaries (periods, question marks, exclamation points) and line breaks for Sentence case, so every sentence and every new line starts capitalized rather than just the very first word.

These are naming conventions used in code rather than prose. camelCase ("firstName") and PascalCase ("FirstName") are common for variables, functions, and class names in languages like JavaScript and Java. snake_case ("first_name") is standard in Python and SQL. kebab-case ("first-name") shows up in URLs, CSS class names, and file names. This tool splits your input into words — handling spaces, hyphens, underscores, and existing camelCase — then rejoins them in whichever style you pick.

Yes. Paste as much text as you like — a single word, a sentence, or a multi-line list — and every mode processes the whole input. UPPERCASE, lowercase, Title Case, Sentence case, and aLtErNaTiNg case preserve your original line breaks. The four code-naming modes (camelCase, PascalCase, snake_case, kebab-case) convert each line into its own identifier, which is handy for turning a pasted list of column headers or labels into code-ready names in one pass.

Alternating case — sometimes called "mocking case" or "sponge case" — flips between uppercase and lowercase on every letter. It is mostly used for jokes, sarcastic captions, and internet meme text rather than anything formal, but it is a one-click option here if you need it.

No. Every conversion happens locally in your browser using plain JavaScript string handling — nothing you type is sent to a server, stored, or logged. That makes it safe to use for private notes, drafts, or anything else you would not want to paste into a random website. Need to count characters instead? Try our word and character counter.