How to use the Case Converter
Last verified 2026-08-08 · about 5 minutes to read
The short version
- 1.Paste your text. Line breaks are preserved, so you can convert a whole list at once.
- 2.Pick a case. The result updates immediately. Programmer cases split on spaces, hyphens, underscores and existing camelCase boundaries.
- 3.Copy the result. Use the copy button, or download it as a .txt file if you converted a long list.
Why this is worth getting right
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.
Method 1 — use the Case Converter on this site
The fastest route. It runs entirely in your browser, so nothing is uploaded and there is no queue to wait in. No account is needed and there is no daily limit.
- 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.
Method 2 — do it without this site
Worth knowing, because a tool you cannot replace is a dependency rather than a convenience. Most tasks in the text division have a command-line or built-in equivalent; it is usually more setup and less convenient, but it works offline and it is scriptable, which matters once you are doing something a hundred times instead of once.
What this tool will not do
Every tool has an edge. These are ours for case converter, stated up front so you find out here rather than halfway through a deadline:
- 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.
Questions people ask
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.