Which cases can I convert to?

UPPER CASE, lower case, Title Case, Sentence case, camelCase, PascalCase, snake_case, kebab-case and CONSTANT_CASE. Every result is shown at once, so you can copy the one you need without switching modes.

How does Title Case decide what to capitalise?

It capitalises the first letter of every word and lowercases the rest. Style guides that keep short words such as of, the and in lowercase disagree with that rule, so check the result if you are following a specific style guide.

What is the difference between Title Case and Sentence case?

Title Case capitalises every word. Sentence case capitalises only the first word of each sentence, and leaves the rest lowercase, which is what most body copy and headlines in modern style guides use.

How does camelCase handle acronyms?

Words are split on spaces, punctuation and camel humps, and a run of capitals followed by a capitalised word is split before the last capital. XMLHttpRequest becomes xmlHttpRequest rather than xMLHttpRequest.

Will it fix text I typed with caps lock on?

Yes. Sentence case is the one you want for a paragraph typed in all capitals, since it lowercases everything and then capitalises each sentence opener.

Does the text leave my browser?

No. The conversion is a string operation running on your device, and nothing is uploaded or stored.

Case converter

Paste your text and get every case at once: UPPER, lower, Title, Sentence, camelCase, PascalCase, snake_case, kebab-case and CONSTANT_CASE. Copy the one you need. Free, no signup, and the text never leaves your browser.

Your text

all nine results update as you type

UPPER CASE

THE QUICK BROWN FOX

THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG. IT WAS WORTH IT.

lower case

the quick brown fox

the quick brown fox jumps over the lazy dog. it was worth it.

Title Case

The Quick Brown Fox

The Quick Brown Fox Jumps Over The Lazy Dog. It Was Worth It.

Sentence case

The quick brown fox.

The quick brown fox jumps over the lazy dog. It was worth it.

camelCase

theQuickBrownFox

theQuickBrownFoxJumpsOverTheLazyDogItWasWorthIt

PascalCase

TheQuickBrownFox

TheQuickBrownFoxJumpsOverTheLazyDogItWasWorthIt

snake_case

the_quick_brown_fox

the_quick_brown_fox_jumps_over_the_lazy_dog_it_was_worth_it

kebab-case

the-quick-brown-fox

the-quick-brown-fox-jumps-over-the-lazy-dog-it-was-worth-it

CONSTANT_CASE

THE_QUICK_BROWN_FOX

THE_QUICK_BROWN_FOX_JUMPS_OVER_THE_LAZY_DOG_IT_WAS_WORTH_IT

Runs on your device. These are string operations running in this tab. Nothing you paste is uploaded, logged or stored, which matters when the text is a client email or an unpublished draft.

What each case is for

Title Case capitalises every word and is what headings and book titles use. This tool capitalises all of them, including short words like of and the. Style guides such as AP and Chicago keep those lowercase, so check the result if you are following one.

Sentence case lowercases everything, then capitalises the first letter of each sentence. It is the fix for a paragraph typed with caps lock on, and it is the house style for headlines in most modern product writing.

camelCase and PascalCase are code conventions: variables and functions in JavaScript use camelCase, while classes and React components use PascalCase.

snake_case, kebab-case and CONSTANT_CASE cover database columns and Python variables, URL slugs and CSS class names, and environment variables respectively.

How words are split for the code cases

Converting to camelCase means deciding where the words are. This splitter breaks on spaces, punctuation, underscores and dashes, and also on camel humps, so text that is already in one code case converts cleanly into another.

Runs of capitals are handled deliberately: a capital run followed by a capitalised word splits before the last capital, so XMLHttpRequest becomes XML, Http, Request and converts to xmlHttpRequest rather than xMLHttpRequest. Digits stay attached to the word they were typed against, so version2 stays one word.

Frequently asked questions

Which cases can I convert to?: UPPER CASE, lower case, Title Case, Sentence case, camelCase, PascalCase, snake_case, kebab-case and CONSTANT_CASE. Every result is shown at once, so you can copy the one you need without switching modes.
How does Title Case decide what to capitalise?: It capitalises the first letter of every word and lowercases the rest. Style guides that keep short words such as of, the and in lowercase disagree with that rule, so check the result if you are following a specific style guide.
What is the difference between Title Case and Sentence case?: Title Case capitalises every word. Sentence case capitalises only the first word of each sentence, and leaves the rest lowercase, which is what most body copy and headlines in modern style guides use.
How does camelCase handle acronyms?: Words are split on spaces, punctuation and camel humps, and a run of capitals followed by a capitalised word is split before the last capital. XMLHttpRequest becomes xmlHttpRequest rather than xMLHttpRequest.
Will it fix text I typed with caps lock on?: Yes. Sentence case is the one you want for a paragraph typed in all capitals, since it lowercases everything and then capitalises each sentence opener.
Does the text leave my browser?: No. The conversion is a string operation running on your device, and nothing is uploaded or stored.

Fixing the capitals is a minute. Learning the material is the rest of the week.

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