Case Converter

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Walk-through

How to Use This Calculator

4 steps

1

Paste or type your text

Drop any text — a sentence, a heading, a variable name, a whole paragraph — into the input box. Counts and every case update instantly as you type; nothing is uploaded or saved.

2

Pick a case

The Convert tab shows all eleven cases side by side. Click any card to feature it at the top, or leave Smart Title Case on to keep small words like “of”, “the”, and “and” lowercase the way style guides expect.

3

Check the counts

Open Counts & Stats for live characters, words, sentences, lines, paragraphs, average word length, and estimated reading time — handy for tweets, meta descriptions, and essay limits.

4

Copy or download

Use the Copy button on any case, or Download .txt to save the featured conversion. Programmer Cases gives you camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, and dot.case ready to paste into code.

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Reference

Formula & Methodology

4 formulas

UPPERCASE / lowercase

out = text.toLocaleUpperCase() | text.toLocaleLowerCase()

Every letter is mapped to its upper or lower form using locale-aware rules, so accented and non-Latin characters convert correctly.

Title Case (smart)

capitalise each word; keep small words lowercase unless first or last

Major words are capitalised; a fixed list of articles, conjunctions, and short prepositions (a, an, the, of, and, to, …) stays lowercase in the middle of the title. Existing all-caps acronyms are preserved.

Sentence case

lowercase all, then capitalise the first letter after . ! ? or a line break

Produces normal prose capitalisation — only the first word of each sentence is capitalised.

Programmer cases

words = split on space / _ / - / . and camelCase boundaries; then join

camelCase joins words with the first lowercase and the rest capitalised; PascalCase capitalises all; snake_case joins with underscores; kebab-case with hyphens; CONSTANT_CASE is uppercase snake_case; dot.case joins with periods.

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Glossary

Key Terms Explained

7 terms

Title Case Capitalisation style for headlines where the major words start with a capital letter and minor words (articles, short prepositions, conjunctions) stay lowercase unless they begin or end the title.

Sentence case Capitalisation style where only the first word of each sentence (and proper nouns) is capitalised, as in ordinary writing.

camelCase An identifier style with no separators where the first word is lowercase and each subsequent word starts with a capital, e.g. firstName. Common for variables and functions in JavaScript and Java.

PascalCase Like camelCase but the first letter is also capitalised, e.g. FirstName. Used for class names, React components, and types.

snake_case An identifier style where words are lowercase and joined by underscores, e.g. first_name. Standard for Python variables and database columns.

kebab-case An identifier style where words are lowercase and joined by hyphens, e.g. first-name. Used for URL slugs, CSS classes, and npm package names.

CONSTANT_CASE Uppercase words joined by underscores, e.g. MAX_RETRIES. Conventionally used for constants and environment variables (also called SCREAMING_SNAKE_CASE).

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Scenarios

Real-World Examples

3 worked examples

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Blogger turning a headline into a slug

A writer types the working title “How to Convert Text Case in 2026” and needs a clean URL slug plus a properly styled headline.

Input How to Convert Text Case in 2026 Featured case kebab-case

kebab-case returns how-to-convert-text-case-in-2026 — ready to drop into a URL. Switching the featured case to Title Case (smart) gives “How to Convert Text Case in 2026”, keeping “to” and “in” lowercase per AP/Chicago style.

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Developer renaming a database column

A developer has the label “User First Name” from a spreadsheet and needs it as both a Python variable and a constant.

Input User First Name Tab Programmer Cases

snake_case gives user_first_name for the column and variable; CONSTANT_CASE gives USER_FIRST_NAME for a config key; camelCase gives userFirstName for the JSON field. One paste, every convention.

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Student checking an essay limit

A student pastes a 480-word introduction to confirm it fits a 500-word cap and to fix a heading typed in ALL CAPS.

Input 480-word introduction paragraph Tab Counts & Stats

Counts & Stats reports 480 words, 2,640 characters, and an estimated 2m 24s reading time, so the intro is under the limit. Sentence case rewrites the shouted heading back to normal capitalisation.

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Deep Dive

Every Text Case, and When to Use It

3 chapters · 4 min read

Capitalisation is more than aesthetics — in writing it follows style guides, and in code it signals what a name represents. This converter handles both worlds: editorial cases like Title and Sentence case, and identifier cases like camelCase and snake_case. Here is how each one is built and where it belongs.

Editorial cases: Title vs. Sentence

Title Case capitalises the major words in a heading while leaving short articles, conjunctions, and prepositions lowercase — that is why “The Lord of the Rings” keeps “of” and “the” small. Our Smart Title Case option follows this rule and still capitalises a small word when it falls first or last. Turn the option off for a simpler style that capitalises every word. Sentence case, by contrast, mirrors ordinary prose: lowercase everything, then capitalise the first letter of each sentence. Use Title Case for headlines and Sentence case for body copy, captions, and UI labels — many modern style guides now prefer Sentence case for buttons and menu items.

Identifier cases: naming things in code

Programming languages encode meaning in capitalisation. JavaScript and Java use camelCase for variables and functions and PascalCase for classes and types; Python and SQL favour snake_case for variables and columns; CSS, URLs, and npm packages use kebab-case; and constants across many languages use CONSTANT_CASE. The converter tokenises your text by splitting on spaces, hyphens, underscores, periods, and the boundary between a lowercase and an uppercase letter — so it can re-case an existing identifier (e.g. turn alreadyCamelCased into already_camel_cased) just as easily as a plain phrase. Matching your project's convention keeps linters quiet and code reviews short.

Counts, edge cases, and Unicode

The Counts & Stats tab gives live word, character, sentence, line, and paragraph totals plus a 200-words-per-minute reading estimate — useful for tweets, meta descriptions, SMS, and essay limits. Conversions are locale-aware, so accented and non-Latin letters change case correctly, and existing acronyms such as HTML or NASA survive a trip through Title Case. Everything runs locally in your browser; your text is never sent to a server, which makes the tool safe for sensitive copy and code.

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Questions

Frequently Asked Questions

7 questions

What is the difference between Title Case and Sentence case?+

Title Case capitalises the major words of a heading and keeps small words like “of”, “the”, and “and” lowercase in the middle. Sentence case capitalises only the first word of each sentence (plus proper nouns), exactly like normal writing. Use Title Case for headlines and Sentence case for body text and UI labels.

What do “Smart Title Case” and small words mean?+

Smart Title Case keeps a fixed list of short words — articles (a, an, the), conjunctions (and, but, or), and short prepositions (of, to, in, on, …) — lowercase unless they appear first or last in the title. Turn the option off to capitalise every word instead.

Which case should I use for code?+

It depends on the language and what you are naming. Use camelCase for JavaScript/Java variables and functions, PascalCase for classes and React components, snake_case for Python variables and database columns, kebab-case for URLs and CSS classes, and CONSTANT_CASE for constants and environment variables.

Can it convert an existing camelCase or snake_case name?+

Yes. The converter splits identifiers on spaces, hyphens, underscores, periods, and camelCase boundaries, so it can re-case any of them. For example, helloWorld becomes hello_world in snake_case or HELLO_WORLD in CONSTANT_CASE.

Does it handle acronyms and accented characters?+

Title Case preserves existing all-caps acronyms such as HTML or NASA instead of lowercasing them. All conversions are locale-aware, so accented and non-Latin letters (é, ñ, ß, и, …) change case correctly.

Is my text private?+

Completely. Every conversion and count happens locally in your browser using built-in JavaScript string methods. Your text is never uploaded, stored, or logged, and the page keeps no record of what you paste.

How is reading time calculated?+

Reading time uses an average of 200 words per minute — a common estimate for adult silent reading. It is a rough guide; actual speed varies with difficulty and familiarity with the material.

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Selected case

All cases

Composition at a glance

How to Use This Calculator

Paste or type your text

Pick a case

Check the counts

Copy or download

Formula & Methodology

Key Terms Explained

Real-World Examples

Blogger turning a headline into a slug

Developer renaming a database column

Student checking an essay limit

Every Text Case, and When to Use It

Editorial cases: Title vs. Sentence

Identifier cases: naming things in code

Counts, edge cases, and Unicode

Frequently Asked Questions

Get a branded PDF of your results

Case Converter

Selected case

All cases

Composition at a glance

How to Use This Calculator

Paste or type your text

Pick a case

Check the counts

Copy or download

Formula & Methodology

Key Terms Explained

Real-World Examples

Every Text Case, and When to Use It

Editorial cases: Title vs. Sentence

Identifier cases: naming things in code

Counts, edge cases, and Unicode

Frequently Asked Questions

Get a branded PDF of your results

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