Case converter: Uppercase & Lowercase Online Text Conversion

Case Converter

Transform text into any case style instantly

Choose a case style

What is an online case converter?
It's a free browser-based tool that instantly rewrites your text into a different letter-casing style, sentence case, UPPER CASE, Title Case, and more, without needing to retype a single word. Instead of manually fixing capitalization in an email, essay, or code snippet, you paste your text once and switch between styles in a click.

How it works

Three steps, no learning curve

Paste or type your text

Drop your sentence, paragraph, or full document into the text box.

Pick a case style

Choose from sentence, lower, upper, capitalized, alternating, title, or inverse case.

Copy or download

Grab your converted text with one click, or save it straight to a .txt file.

Reference

The 7 case styles at a glance

Style

Example

Sentence case

Hello world. This is a test.

lower case

hello world

UPPER CASE

HELLO WORLD

Capitalized Case

Hello World

aLtErNaTiNg cAsE

hElLo WoRlD

Title Case

Hello World of the Web

InVeRsE CaSe

hELLO wORLD

Features

What's included

7 case styles

Sentence, lower, UPPER, Capitalized, aLtErNaTiNg, Title, and InVeRsE case, all in one place.

Instant conversion

Text transforms the moment you pick a style. No buttons to wait on, no page reloads.

Copy in one click

Send the converted text straight to your clipboard, ready to paste anywhere.

Download as .txt

Save your converted text as a plain text file for later, no account needed.

Live stats

Character, word, and line counts update as you type, so you always know what you're working with.

Private by design

Everything runs in your browser. Your text is never uploaded or stored on a server.

Why use it

Built for everyday writing tasks

Fix accidental caps lock. Recover a message typed with caps lock on without retyping it from scratch.

Match a style guide. Convert headlines to Title Case or body copy to Sentence case to stay consistent with editorial standards.

Clean up pasted text. Text copied from PDFs or old documents often comes in with inconsistent casing, normalize it in one click.

Save time on repetitive edits. Skip manually capitalizing or lowercasing long lists, titles, or datasets by hand.

No installs, no sign-up. It runs entirely in your browser tab and works the same on desktop and mobile.

FAQ

Common questions

An online case converter is a free browser tool that rewrites text into a different letter-casing style, like turning "hello world" into "HELLO WORLD" or "Hello World." It saves you from manually retyping or fixing capitalization by hand.