Case converter

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Convert text case online instantly—paste your text and switch between uppercase, lowercase, title case, sentence case, camelCase, PascalCase, snake_case, kebab-case, and Toggle cASE. This all-in-one case converter (aka text case changer, online letter case converter) is perfect for cleaning copy, formatting code identifiers, and standardizing headlines—think “convert lowercase to uppercase online”, “change text to title case”, or “snake_case to camelCase converter”.

What is a Case Converter?

A case converter tool transforms the capitalization and word separators of any string. Beyond basic UPPERCASE/lowercase, a modern online case converter also handles developer-friendly formats like camelCase, PascalCase, snake_case, and kebab-case, plus editorial styles such as title case converter and sentence case converter.

How to use the Case Converter (step-by-step)

  1. Paste your text or upload a file (TXT/CSV/JSON).
  2. Choose a conversion: Uppercase, Lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case, kebab-case, or Toggle Case.
  3. Apply options (keep acronyms, small-words list for title case, preserve numbers/underscores).
  4. Copy the converted result or download it for your project.

Popular conversions (quick reference)

Uppercase & Lowercase

Turn any text into ALL CAPS or all lowercase. Long-tail: uppercase converter online, lowercase to uppercase, convert text to lowercase.

Title Case (Headline Case)

Capitalize major words while controlling minor words like “and, of, in.” Long-tail: AP/Chicago title case converter, headline capitalization tool.

Sentence case

Capitalize the first letter of each sentence—great for messy copy pasted from chat or spreadsheets.

Developer formats

  • camelCase ←→ snake_case, kebab-case, PascalCase
  • Long-tail: convert snake_case to camelCase, kebab-case to PascalCase, variable name case converter.

Who is this for?

  • Content editors & marketers fixing headline capitalization with a title case converter.
  • Developers normalizing identifiers (kebab-case to camelCase, camelCase to snake_case).
  • Students & researchers cleaning citations and abstracts (convert sentence case).
  • Data teams unifying CSV headers with an online case converter.

Best practices & tips

  • Protect acronyms: Keep lists like API, HTML, URL always uppercase in Title Case.
  • Small words in headlines: Configure “a, an, and, as, at, for, in, of, on, or, the, to” to stay lowercase (except at start/end).
  • Unicode-aware: Handle Turkish/Icelandic/Greek letters correctly; prefer UTF-8 for uppercase/lowercase converter accuracy.
  • Developer safety: When converting identifiers, choose whether to keep digits and underscores.

Examples

Editorial styles

Input:   the quick brown fox jumps over the lazy dog
Title:   The Quick Brown Fox Jumps over the Lazy Dog
Sentence:The quick brown fox jumps over the lazy dog.
UPPER:   THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG
lower:   the quick brown fox jumps over the lazy dog

Code identifier case

Input:        user profile image url
camelCase:    userProfileImageUrl
PascalCase:   UserProfileImageUrl
snake_case:   user_profile_image_url
kebab-case:   user-profile-image-url

Common use cases

  • Blog & SEO: Standardize H2/H3 titles with a headline capitalization tool.
  • Design systems: Match UI text to brand rules (ALL CAPS buttons, sentence case labels).
  • APIs & data: Normalize JSON keys: convert camelCase to snake_case for back-end services.
  • Documentation: Clean inconsistent copy pasted from multiple sources.

FAQ

What’s the difference between Title Case and Sentence case?

Title Case capitalizes principal words; Sentence case only capitalizes the first word and proper nouns.

Can I convert kebab-case to camelCase?

Yes—use the kebab-case to camelCase converter option; hyphens become word boundaries.

Will acronyms stay uppercase in Title Case?

Enable “preserve acronyms” and add your custom list (e.g., API, HTTP, JSON).

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