Case Converter
Twelve cases including camelCase, snake_case and proper Title Case.
Start typing above and the result appears here.
Next step
How to use Case Converter
Paste your text
Line breaks are preserved, so you can convert a whole list at once.
Pick a case
The result updates immediately. Programmer cases split on spaces, hyphens, underscores and existing camelCase boundaries.
Copy the result
Use the copy button, or download it as a .txt file if you converted a long list.
Why use this case converter
Runs on your device
Your input is handled entirely in this browser tab. Nothing is uploaded, so there is nothing for us to store, log or leak.
No sign-up, no quota
No account, no daily limit, no watermark and no email wall. Use it once or two hundred times a day.
Built to be linked
Options are stored in the URL, so a configured tool is a link you can send to a colleague or bookmark.
Technical notes
Almost every case converter online implements "Title Case" as "capitalise every word". That is not Title Case in any published style guide. This tool implements the Chicago Manual rule — minor words stay lowercase unless they are first or last — and lists exactly which words it treats as minor, so the output is defensible in an editorial review.
Title Case: this tool versus the common implementation
| Input | Capitalise every word | Chicago Title Case |
|---|---|---|
| the lord of the rings | The Lord Of The Rings | The Lord of the Rings |
| a tale of two cities | A Tale Of Two Cities | A Tale of Two Cities |
| what to look for in | What To Look For In | What to Look for In |
Supported
- Twelve cases, including four programmer conventions
- Multi-line input — each line is treated as its own title
- Unicode-aware upper and lower casing
- Detects existing camelCase and PascalCase boundaries when splitting
Limits and trade-offs
- Acronyms are not detected and will be lowercased by the lower-casing modes.
- Sentence case treats "e.g." and "Dr." as sentence ends.
- Programmer cases drop non-ASCII characters, since identifiers rarely allow them.
Last verified August 2026 · benchmarks re-run each quarter.
Frequently asked questions
What is the difference between Title Case and capitalising every word?
Title Case leaves minor words lowercase unless they start or end the title. "The Lord of the Rings" is Title Case; "The Lord Of The Rings" is just every word capitalised. This tool follows the Chicago Manual of Style list of articles, short prepositions and conjunctions.
How does it convert to camelCase?
It splits the input on spaces, hyphens, underscores, dots and existing case boundaries, then joins the pieces. "user-ID number" and "user_id_number" both become "userIdNumber", so mixed-convention input still gives a consistent result.
Does sentence case know where sentences end?
It capitalises the first letter after a period, exclamation mark, question mark or line break, and lowercases everything else. Abbreviations like "e.g." will therefore trigger a capital, which is the trade-off every rule-based converter makes.
Are acronyms preserved?
Not in the lower-casing modes. "NASA" becomes "nasa" in lower case and "Nasa" in Title Case, because there is no reliable way to tell an acronym from a shouted word without a dictionary. Convert acronyms separately if that matters.
Does it work with non-English text?
Upper, lower and toggle use the browser's Unicode case mappings, so Greek, Cyrillic and accented Latin convert correctly. The programmer cases strip non-ASCII characters, since identifiers in most languages cannot contain them.