Text Case Converter — UPPER, Title, camelCase & More
Convert text into 10 cases at once: UPPERCASE, lowercase, Title, Sentence, camelCase, PascalCase, snake_case, kebab-case, CONSTANT and aLtErNaTiNg.
HELLO WORLD, THIS IS A TEST SENTENCE.
hello world, this is a test sentence.
Hello World, This Is A Test Sentence.
Hello world, this is a test sentence.
helloWorldThisIsATestSentence.
HelloWorldThisIsATestSentence.
hello_world_this_is_a_test_sentence
hello-world-this-is-a-test-sentence
HELLO_WORLD_THIS_IS_A_TEST_SENTENCE
hElLo WoRlD, tHiS iS a TeSt SeNtEnCe.
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Two kinds of case, and only one is safe to automate
Ten formats, and they split cleanly. The programming cases are deterministic — one input, one correct output, no judgement. The two English cases are editorial decisions that a rule can only approximate. Knowing which is which is what stops you trusting the wrong output.
The mechanical ones
- UPPERCASE and lowercase — no ambiguity at all.
- camelCase — JavaScript and Java variables. First word lower, the rest capitalised, no separators.
- PascalCase — class and type names in C#, Java and Python. Every word capitalised.
- snake_case — Python and Ruby variables, and SQL columns. Lower case, underscores between words.
- kebab-case — URLs, CSS class names and most config files. Lower case, hyphens.
- CONSTANT_CASE — constants and environment variables.
- aLtErNaTiNg — no technical use whatsoever.
Renaming user_id to userId, or converting a pasted column of headings into snake_case, has one right answer every time. Automating it is safe and saves real work.
Title Case, where honesty is required
The converter capitalises the first letter of every word. That is not what published style guides mean by title case.
Chicago, AP and APA all keep short articles, conjunctions and prepositions lower case unless they open or close the title. So the quick brown fox and the hound becomes The Quick Brown Fox And The Hound here, where a style guide wants The Quick Brown Fox and the Hound — with and and the second the left alone.
And the guides disagree with each other about which words qualify and at what length, which is precisely why no converter can be right for everyone. Treat the output as a first pass to correct by eye, not a finished headline.
Sentence case has the opposite problem
It lower-cases the text and capitalises the opening letter. That is correct for ordinary words and wrong for every word that needs a capital for its own sake.
Proper nouns and acronyms do not survive: Paris comes back as paris, NASA as nasa. No rule based on position can prevent it, because the tool has no way to know that a given word is a name. Read the output before publishing it — this is the conversion that most often needs manual repair.
What changing case cannot fix
It changes capitalisation. Nothing else.
A misspelling survives the trip: usrId converted to camelCase is still usrId. Double spaces stay double. And a badly chosen name in perfect camelCase is still a badly chosen name — doStuff2 is correctly formatted and tells the next reader nothing.
Everything runs in your browser and nothing is uploaded. For the transformations that are not about capitalisation — deduplicating lines, sorting, collapsing whitespace — see the text utilities.
How to use the Text Case Converter
Takes about a minute. No signup, no download, your data stays in your browser.
- 1Open the tool. Scroll up to the Text Case Converter above — it loads instantly in your browser, no install needed.
- 2Enter your values. The fields come pre-filled with realistic defaults so you can see how it works — replace them with your own numbers.
- 3Read the result. The output updates instantly. Copy or share it — nothing is uploaded to a server, everything stays on your device.
Frequently asked questions
Common questions about the Text Case Converter.
Why does Title Case not match my style guide?
Because the converter capitalises every word, while Chicago, AP and APA all keep short articles, conjunctions and prepositions lower case unless they open or close the title. The guides also disagree with each other about which words qualify, which is why no converter can be universally right. Use the output as a first pass and fix the small words by eye.
Why did Sentence case ruin my proper nouns?
Because it lower-cases everything and then capitalises the opening letter, and no position-based rule can know that Paris is a city or that NASA is an acronym. Both come back lower case. It is the conversion most likely to need manual repair, so read the result before publishing it.
Which case should I use in code?
Follow the convention of the language rather than a preference: camelCase for JavaScript and Java variables, PascalCase for class and type names, snake_case for Python and Ruby variables and SQL columns, CONSTANT_CASE for constants, and kebab-case for URLs, CSS class names and config files.
Is automatic conversion safe?
For the programming cases, yes — each has exactly one correct output for a given input, so there is no judgement to get wrong. For Title Case and Sentence case, no: both are editorial choices the tool can only approximate, and both need checking before the text goes anywhere.
Will it fix my spelling or spacing?
No, it changes capitalisation and nothing else. A typo survives the conversion intact, double spaces stay double, and a poorly chosen variable name in perfect camelCase is still a poorly chosen name. Case is the last step of tidying, not the whole of it.
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