Uppercase / Lowercase Converter

Convert text between uppercase, lowercase, title case, sentence case and other formats in one click.

Paste your text, pick a format, copy the result. Useful when caps lock wins or a system demands one particular style.

  • 0Words
  • 0Characters

How Does It Work?

  1. Paste your textA word, a sentence or a whole document — the conversion is instant either way.
  2. Pick a caseEight formats, from plain uppercase to the naming styles used in code.
  3. Copy it outOr send the result back into the input box to apply another format on top.

What Is It Used For?

Rescuing a paragraph typed with caps lock on used to mean retyping it. Beyond that, systems are fussy: spreadsheets want consistent capitalisation, style guides want title case, and code wants camelCase, snake_case or kebab-case depending on the language.

  • Fixing text accidentally typed in all capitals.
  • Formatting a headline in proper title case.
  • Normalising imported data so names and cities are capitalised consistently.
  • Converting a label into a variable name, a database column or a URL slug.
  • Preparing text for a system that only accepts lowercase.

Examples

InputFormatOutput
hello worldUPPERCASEHELLO WORLD
HELLO WORLDlowercasehello world
the art of the dealTitle CaseThe Art of the Deal
hello world. bye nowSentence caseHello world. Bye now
user first namecamelCaseuserFirstName
User First Namekebab-caseuser-first-name

Frequently Asked Questions

What is the difference between title case and sentence case?

Title case capitalises most words but leaves short joining words such as "of", "the" and "and" in lowercase unless they start or end the title. Sentence case capitalises only the first word of each sentence.

Which words stay lowercase in title case?

Common articles, conjunctions and short prepositions — a, an, and, as, at, but, by, for, in, of, on, or, the, to, up, via and with. They are still capitalised at the start or end of a title.

Does it work with accented characters and other alphabets?

Yes. Case conversion uses your browser\u2019s Unicode support, so accented Latin letters, Greek and Cyrillic all convert correctly.

What are camelCase, snake_case and kebab-case?

Naming styles used in software. camelCase joins words with capitals (userFirstName), snake_case joins them with underscores (user_first_name), and kebab-case joins them with hyphens (user-first-name) — the last is also the usual style for URLs.

Is my text sent anywhere?

No. The conversion runs in your browser and nothing is uploaded.

Free. No registration. This tool runs entirely in your browser, so the data you enter stays on your device.

Word Counter

Count words, characters, sentences and paragraphs as you type.

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Remove Duplicate Lines

Clean a list by deleting repeated lines, keeping the order.

Character Counter

Count characters with and without spaces, against common limits.