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English Case Converter

Quickly convert English text between uppercase, lowercase, title case, sentence case, camelCase, PascalCase, snake_case and more. All conversion is done locally in your browser.

Characters: 0Words: 0

Example

welcome to the online toolkit:
welcome to the online toolkit
UPPER CASE:
WELCOME TO THE ONLINE TOOLKIT
lower case:
welcome to the online toolkit
Title Case:
Welcome To The Online Toolkit
Sentence case:
Welcome to the online toolkit
camelCase:
welcomeToTheOnlineToolkit
PascalCase:
WelcomeToTheOnlineToolkit
snake_case:
welcome_to_the_online_toolkit
kebab-case:
welcome-to-the-online-toolkit
CONSTANT_CASE:
WELCOME_TO_THE_ONLINE_TOOLKIT
rEVERSE cASE:
WELCOME TO THE ONLINE TOOLKIT

About This Tool

The English Case Converter can quickly convert English text to uppercase, lowercase, title case, sentence case, camelCase, PascalCase, snake_case and more. All conversion is done locally in your browser without uploading files. It is suitable for article editing, code naming, title formatting and social media content processing.

How to Use

  1. Paste or enter English text in the input box.
  2. Select the case format you need.
  3. View the converted result.
  4. Click "Copy" or download as a TXT file.

Conversion Rules

UPPER CASE: Converts all English letters to A–Z.
lower case: Converts all English letters to a–z.
Sentence case: Capitalizes only the first letter of each sentence.
Title Case: Capitalizes the first letter of each word. This tool uses general title case rules.
camelCase: The first word is lowercase, subsequent words have their first letter capitalized, and spaces are removed.
PascalCase: All words have their first letter capitalized, and spaces are removed.
snake_case: Words are connected with underscores, all lowercase.
kebab-case: Words are connected with hyphens, all lowercase.
CONSTANT_CASE: Words are connected with underscores, all uppercase.
rEVERSE cASE: Inverts the case of each letter.
Numbers: Numbers are generally kept unchanged.
Punctuation & Line Breaks: Punctuation and line breaks are preserved when the "Preserve line breaks" option is enabled.

Use Cases

Fix Caps Lock Text
Fix text accidentally typed with Caps Lock on.
Format Titles
Format blog and email titles.
JS Variable Names
Generate JavaScript variable names in camelCase or PascalCase.
Database Fields
Generate database field names in snake_case.
URL Slugs
Create URL slugs in kebab-case.
Product Names
Standardize product name formatting.
Social Media
Process social media copy case formatting.
Code Review
Quickly check and fix naming conventions in code.

Limitations

Title case follows different standards (APA, AP, Chicago), which handle small words like a, the, of differently. This tool uses general title case rules. It may not correctly identify proper nouns such as iPhone, YouTube, or OpenAI. Abbreviations like NASA may be converted to Nasa. The tool cannot determine whether a sentence is grammatically correct. Non-English characters are generally kept as-is. Hyphenated and apostrophe words like mother-in-law and don’t should be tested individually.

Data & Privacy

All text conversion is done in your browser. Input is not uploaded to any server and is not saved. Closing or refreshing the page will clear your input.

Frequently Asked Questions

Will case conversion change numbers?
No. Numbers are kept unchanged during case conversion.
Are punctuation and line breaks preserved?
Yes. Punctuation and line breaks are preserved when the "Preserve line breaks" option is enabled.
What is the difference between Title Case and Sentence case?
Title Case capitalizes the first letter of each word. Sentence case only capitalizes the first letter of each sentence.
What is the difference between camelCase and PascalCase?
camelCase starts with a lowercase letter (helloWorld). PascalCase starts with an uppercase letter (HelloWorld).
How do I convert text to URL format?
Use kebab-case to create URL-friendly slugs. For example, "Hello World" becomes "hello-world".
Will my text be uploaded to a server?
No. All conversion is done locally in your browser.
Can I convert Chinese text?
This tool is designed for English text. Chinese characters do not have case and will be kept as-is.
Does it work on mobile?
Yes. The tool works on all devices with a web browser.
Is there a character limit?
There is no manually set limit, but very long text may affect performance on low-end devices.