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    Always synced: the tools on your board, their order and size.

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Your choice is stored in this browser only. Notifications never show personal content such as a message or a number. They work while a Synsi tab is open; closed tabs get none.

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Case Converter – Change Text to Upper, Lower or Title Case

Paste your text and switch between uppercase, lowercase, title case, sentence case and programming cases with one click.

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Convert to
Runs in your browser – your data never leaves your device Also available via our free API

How to use the Case Converter

  1. 1 Type or paste your text into the input box.
  2. 2 Choose the case you want, for example Title Case or snake_case.
  3. 3 Copy or download the converted text.

Fix capitalisation in seconds

Accidentally typed a paragraph with Caps Lock on? Need a headline in title case, or a variable name in camelCase? Retyping is slow and error-prone. This case converter rewrites your text instantly while keeping every character, space and line break intact.

Available cases

Case Example Typical use
UPPERCASE HELLO WORLD Headings, acronyms, emphasis
lowercase hello world Normalising data, email addresses
Title Case Hello World Headlines, book and song titles
Sentence case Hello world. How are you? Body text, UI labels
camelCase helloWorld JavaScript and Java variables
PascalCase HelloWorld Class and component names
snake_case hello_world Python, database columns
kebab-case hello-world URLs, CSS classes, file names
CONSTANT_CASE HELLO_WORLD Constants and environment variables

Works with every language

The converter uses full Unicode case mapping, so accented and non-Latin letters are converted correctly – élan becomes ÉLAN and the German ß becomes SS in uppercase. For the programming cases, punctuation is removed and word boundaries are detected automatically, including existing camelCase words.

Private and instant

Your text is converted in your browser as you type and is never sent to a server.

Frequently asked questions

What is the difference between title case and sentence case?

Title case capitalises the first letter of every word (“The Quick Brown Fox”). Sentence case only capitalises the first letter of each sentence (“The quick brown fox.”), like normal prose.

How do I convert text to camelCase or snake_case?

Paste your text and choose camelCase or snake_case. Spaces, hyphens and punctuation are treated as word boundaries, and existing camelCase words are split correctly.

Does the converter keep line breaks?

Yes. For UPPERCASE, lowercase, Title Case, Sentence case, alternating and inverse case, all spacing and line breaks are preserved exactly.

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