Case Converter Online

Fast & free text case conversion — paste your text below.

Chars: 0 · Words: 0 · Lines: 0

Transform your text in seconds

Convert text to uppercase, lowercase, and sentence case
Capitalized and alternating case support
One-click copy, no signup required

Case Converter Guide

caseconvertonline.com is a free online case converter that helps you change text case instantly. Convert any text to UPPERCASE, lowercase, Sentence case, Capitalized, or Alternating case in one click.

Uppercase (UPPER CASE)

Use the uppercase converter to make all letters capital. Great for headings, labels, and emphasis.

this is a test → THIS IS A TEST

Lowercase (lower case)

The lowercase converter makes all letters small — useful for cleaning pasted text and normalizing content.

THIS IS A TEST → this is a test

Sentence case

Sentence case capitalizes the first letter of each sentence while keeping the rest natural.

this is a test. this is another sentence. → This is a test. This is another sentence.

Capitalized

Capitalized text makes the first letter of each word uppercase — useful for titles and headings.

this is a test → This Is A Test

Alternating case

Alternating case switches between lower and upper letters for a playful, stylized look.

this is a test → tHiS iS a tEsT

Why Use This Online Case Converter?

Free and easy to use
Works directly in your browser
No registration or downloads required
Supports long and short text
Ideal for writing, coding, and content creation

Related Use Cases

This text case converter is useful for:

Formatting blog posts and articles
Editing emails and documents
Preparing text for code or data input
Creating consistent headings and titles
Fixing capitalization mistakes instantly