Case Converter

Convert text between uppercase, lowercase, title case, sentence case, and camelCase. Essential for programmers and writers.

Text Tools

Quick answer:Case conversion rules: UPPERCASE = all capitals; lowercase = all small; Title Case = First Letter Of Each Word Capitalised; Sentence case = only the first letter of a sentence capitalised; camelCase = firstWordLower ThenUppercase (used in code). This tool converts any text between all five cases instantly.

Azam Sharieff· Finance & Tools Reviewer

Last reviewed: 2 October 2026

Fix the Caps Lock Disaster

We've all done it. You type out an incredibly thoughtful, three-paragraph email while looking at your keyboard, only to look up and realize the Caps Lock key was on the entire time.

Instead of deleting it and retyping the whole thing, you can just paste the ALL CAPS disaster into this tool, click 'Sentence case,' and it will magically fix the formatting in a fraction of a second.

Perfect Formatting for Writers and Coders

This tool goes far beyond just fixing mistakes. If you are drafting a blog post and need all your subheaders to be in perfect 'Title Case' (Where Every Word Is Capitalized), doing it manually is tedious and error-prone.

For software developers, converting standard text into camelCase or snake_case for variable names is a repetitive chore. This converter completely automates the busywork of text formatting.

Picking the right text case

Sentence case capitalises only the first word and proper nouns, and suits most body text. Title Case capitalises main words and is common for headings. UPPERCASE works for short labels but is harder to read in long text. Developers also use camelCase (userName), snake_case (user_name) and kebab-case (user-name) for variables and URLs.

Where automatic conversion needs a human check

Title case rules differ between style guides, particularly for short words such as of, and, the. Names like iPhone, McDonald's or GST should keep their intended capitalisation, so review the output. A quick tidy of messy spacing with Remove Extra Spaces and a length check with the Word Counter make a good finishing routine.

Frequently Asked Questions

What exactly is 'Sentence case'?

Sentence case mimics how we naturally write. It capitalizes the very first letter of a sentence, and converts every other letter to lowercase (except for proper nouns that it might not automatically detect).

How does the Title Case algorithm work?

Title Case capitalizes the first letter of almost every word. However, standard editorial rules dictate that minor words (like 'a', 'the', 'of', 'in') should remain lowercase unless they are the very first word of the title.

What is camelCase used for?

camelCase is a standard naming convention used heavily by computer programmers. It joins multiple words together without spaces, and capitalizes the first letter of every word except the first one (e.g., 'thisIsMyVariable').

Can I convert text into snake_case?

Yes! snake_case is another programming favorite where words are forced into lowercase and spaces are replaced entirely with underscore characters (e.g., 'this_is_my_variable').

Is it safe to paste confidential business emails here to fix them?

Completely safe. Our case converter operates 100% locally using JavaScript. Your text is never transmitted to an external server.

Will it fix my grammar or spelling mistakes too?

No. This tool strictly focuses on capitalizing and lowercasing individual letters. It does not run a spell check or alter the actual words you wrote.

Related Tools

📝

Word Counter

Count words, characters & sentences

🧹

Remove Extra Spaces

Clean up whitespace from text

🔁

Text Repeater

Repeat text multiple times