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Free Online Text Case Converter

Convert text between uppercase, lowercase, title case, sentence case, camelCase, PascalCase, snake_case, and kebab-case instantly — free, in your browser, with one click.

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Case Converter — free online tool interface

Free Online Case Converter

Quick Answer

What is the difference between camelCase, PascalCase, snake_case, and kebab-case?

camelCase starts lowercase with each subsequent word capitalised (myVariableName) — standard in JavaScript and Java. PascalCase capitalises every word (MyClassName) — used for class and component names. snake_case uses underscores (my_variable_name) — standard in Python and database columns. kebab-case uses hyphens (my-variable-name) — standard for URLs, CSS class names, and HTML attributes. CONSTANT_CASE (MY_CONSTANT) is snake_case in all-caps, used for constants and environment variables.

Free Text Case Converter — change text to uppercase, lowercase, title case online

Instantly format your text or code into 11 different cases including uppercase, lowercase, Title Case, camelCase, snake_case, and more. Featuring real-time word counting, one-click copy, and text file downloads.

Plain Text Input
Words: 0Chars: 0Lines: 0
Converted Output
Select Formatting Options

Which case convention belongs where

ConventionExampleUsed in
camelCasegetUserByIdJavaScript/TypeScript variables and functions, JSON keys in APIs
PascalCaseUserProfileReact components, TypeScript interfaces/types, class names
snake_caseuser_profile_idPython variables/functions, PostgreSQL column names, Ruby
SCREAMING_SNAKEMAX_RETRY_COUNTConstants in most languages, environment variables
kebab-caseuser-profileCSS classes, HTML attributes, URL slugs, file names
dot.caseapp.settings.themeConfig keys (dotenv, properties files), namespace paths

Why mixing cases causes silent bugs

The most common bug pattern: a REST API returns user_id (snake_case), your frontend code expects userId (camelCase), and the value silently becomes undefined. No error, no warning — just missing data. JavaScript property access is case-sensitive: obj.userId and obj.user_id are different keys.

CSS has the same issue in the opposite direction: className="userProfile" won't match a stylesheet rule for .user-profile. Establish a convention per layer — API responses, database columns, frontend variables, CSS classes — and enforce it with a linter or code review checklist rather than relying on memory.

Related text tools

TheFreeAITools — Case Converter is a free, browser-based text formatting tool that converts text between 11 case formats: UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, alternating case, and toggle case. All conversion runs locally in your browser — your text is never sent to any server, never stored, and never shared. Includes real-time word and character counting, one-click clipboard copy, and .txt file download. Fully free with no account required, maintained through 2026.

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What is Case Converter?

Case Converter is a free browser-based tool that changes the capitalization style of any text. Instead of manually retyping text or using complex find-and-replace operations, you paste your text and click the target case format — the conversion is instant.

Different contexts require different case formats: programming uses camelCase for JavaScript variables, PascalCase for class names, snake_case for Python and database columns, and kebab-case for CSS classes and URLs. Writing requires Sentence case for readable prose and Title Case for headings. ALL CAPS is used for acronyms, constants, and emphasis.

This tool supports all common case styles: UPPERCASE, lowercase, Title Case, Sentence case, camelCase (first word lowercase), PascalCase (all words capitalized), snake_case (underscore-separated), kebab-case (hyphen-separated), and Alternating CaSe (for memes). All conversions happen in your browser — nothing is sent to a server.

How to use Case Converter in 3 steps
  1. 1

    Paste or type your text

    Paste any text — a sentence, paragraph, heading, variable name, or list of words — into the input field.

  2. 2

    Select a case style

    Click the button for the case style you want: UPPERCASE, lowercase, Title Case, camelCase, snake_case, etc.

  3. 3

    Copy the converted text

    Click Copy to copy the converted text to your clipboard, ready to paste into your document or code.

Key features and benefits
  • Converts text to 8+ case styles instantly in the browser
  • Supports programming cases: camelCase, PascalCase, snake_case, kebab-case
  • Supports writing cases: UPPERCASE, lowercase, Title Case, Sentence case
  • No character limit — convert paragraphs, code blocks, or entire articles
  • Free, no account, no signup — works offline once loaded
Common use cases

A developer renames a list of database column names from snake_case to camelCase for a JavaScript API response without writing a transformation script.

A content writer converts a draft title written in all-caps notes to Title Case format for a blog post heading.

A data analyst standardizes a CSV column of inconsistently capitalized product names to lowercase before importing into a database.

Why browser-based works better

Rather than using a regex in your code editor or writing a one-off script, this tool handles all common case conversions with a single click — useful for quick one-off transformations during writing, coding, or data preparation.

Programming-specific cases (camelCase, PascalCase, snake_case, kebab-case) handle multi-word input correctly, splitting on spaces, underscores, and hyphens to reconstruct the target format.

You might also need

Continue this workflow with nearby browser-based tools so you can validate, convert, and ship output without context switching.

References and standards

Case Converter FAQs

Quick answers about the workflow, privacy, and where this tool fits in a broader job.

What is the difference between camelCase and PascalCase?

camelCase starts with a lowercase letter and capitalizes subsequent words (e.g., myVariableName). PascalCase capitalizes every word including the first (e.g., MyVariableName). camelCase is common for JavaScript variables and functions; PascalCase is used for class names and React components.

When should I use snake_case vs kebab-case?

snake_case (underscores) is standard in Python, Ruby, and SQL database column names. kebab-case (hyphens) is standard for CSS class names, HTML attributes, and URL slugs. The choice is usually determined by the language or framework convention you are working in.

What is Title Case exactly?

Title Case capitalizes the first letter of each major word: nouns, verbs, adjectives, and adverbs. Short words like articles (a, an, the), prepositions (in, on, at), and conjunctions (and, but, or) are typically kept lowercase unless they are the first word. Different style guides (Chicago, APA, AP) have slightly different rules.

Can this convert variable names from one programming convention to another?

Yes. Paste a list of variable names (one per line or space-separated) and convert from snake_case to camelCase, or any other combination. The tool splits on underscores, hyphens, and spaces to reconstruct the target format.

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Built and maintained by

Achraf A.

Founder & developer — built and maintains every tool on this site

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Tested in Chrome, Firefox, and Safari on desktop and mobile.

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