Case Converter

Paste your text, pick a style, and copy the result. Fourteen conversions, from UPPERCASE to kebab-case, all processed on your device.

100% Client-Side Processing

How to use

Type or paste your text into Your text.
Choose a style. The result updates immediately in Converted text.
Select Copy result, or Download .txt to save it as a file.
To chain two conversions, select Use result as input and pick another style.

Identifier styles (camelCase, PascalCase, snake_case, CONSTANT_CASE and Slugify) treat every line as a separate name, so you can convert a whole list at once.

Features

Fourteen conversions: UPPERCASE, lowercase, Title Case, Sentence case, Capitalized Words, tOGGLE cASE, Slugify, camelCase, PascalCase, snake_case, CONSTANT_CASE, kebab-case, dot.case and aLtErNaTiNg.
Live results as you type or change the style.
Unicode aware: accented Latin, Greek and Cyrillic letters convert correctly. Scripts without letter case, such as Urdu, Arabic or Chinese, are left unchanged.
Copy, select or download the output, and send it back to the input for a second conversion.
Private: conversion runs in your browser. The text is never uploaded.

How each mode works

Title Case capitalises every word except short ones (a, an, the, and, but, or, for, of, in, on, to, with and similar) unless they are the first or last word. Title Case has no single universal rule: AP, Chicago, APA and MLA differ, so check your style guide for formal titles.
Sentence case lowercases the text, then capitalises the first letter after the start of the text, after . ! ? and after a line break. It cannot know which words are names or acronyms.
Capitalized Words capitalises every word, including short ones.
camelCase, PascalCase, snake_case, CONSTANT_CASE split each line into words at spaces, punctuation, underscores, hyphens and lower-to-upper boundaries (so userID becomes user and ID), then join them.
Slugify makes lowercase, hyphen-separated text and keeps accented and non-English letters. For transliteration and separator options use the Slug Generator.

Examples

Input

the quick brown fox jumps over the lazy dog

Title Case

The Quick Brown Fox Jumps over the Lazy Dog

Input

HELLO WORLD. THIS IS LOUD. WHY?

Sentence case

Hello world. This is loud. Why?

Input

user account balance

camelCase

userAccountBalance

Input

Max retry count

CONSTANT_CASE

MAX_RETRY_COUNT

Input

getHTTPResponse

snake_case

get_http_response

FAQs

Which Title Case rule does this use?

A common English convention: capitalise each word, but keep short articles, conjunctions and prepositions lowercase unless they begin or end the title. Style guides disagree (for example on prepositions of four or more letters), so treat the output as a good starting point and adjust to your guide.

Does it work with accented letters and other languages?

Yes for languages with letter case. It uses Unicode case rules, so é becomes É and ß becomes SS in uppercase. Scripts such as Urdu, Arabic, Hindi and Chinese have no uppercase and lowercase, so they stay as they are.

Why did Sentence case not capitalise a name?

Sentence case lowercases everything and then capitalises sentence starts. It has no dictionary of names, so capitalise names and acronyms yourself afterwards.

How are numbers and symbols handled in camelCase or snake_case?

Numbers stay attached to their word. Spaces and punctuation act as word separators and are removed in these identifier styles.

Is my text sent to a server?

No. The conversion happens in your browser, and the page does not send what you type to us or to any other service.

Is there a size limit?

Very large input is rejected above two million characters to keep your browser responsive. Split bigger files into parts.

About this tool

Case Converter changes the capitalisation and word-joining style of text. Writers use it to fix headlines typed in all capitals, editors to normalise lists, and developers to turn labels into variable names.

The conversion is deterministic: the same input and mode always give the same output. Nothing is generated by AI, and nothing is stored.

Keyboard

Ctrl + Enter: Copy the result (Cmd + Enter on Mac).
Esc: Closes an open information panel or menu. It never clears your text.
Tab: Moves between boxes and buttons.

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Text CleanerRemove extra spaces and blank lines, fix line endings and strip unwanted characters.
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Privacy

Your text is processed by JavaScript in your browser tab. It is not sent to us or anyone else, and it is not saved. It is still visible to you and to any browser extensions you use, so clear it on shared computers. Read the policy.