Case Converter
Accidentally left Caps Lock on? Need proper Title Case for your headline? We've got you covered.
Convert text between upper, lower, title and sentence case
Paste text, pick a case, copy the result. Six conversions are available and each one runs instantly in your browser — nothing is uploaded and nothing is stored.
This is the fastest fix for a paragraph typed with Caps Lock on, a headline that needs proper title case, or a list pasted out of a spreadsheet in the wrong case entirely.
What each conversion does
- Sentence case — capitalises the first letter of each sentence and lowercases the rest. Use it to rescue text typed in all caps.
- lower case — every letter lowercased. Useful for email addresses, URLs, tags and CSV columns.
- UPPER CASE — every letter capitalised. Fine for short labels; avoid it for body text, which is measurably slower to read in all caps.
- Title Case — capitalises the first letter of every word. Quick for headlines, though it capitalises short words that most style guides leave lowercase.
- Capitalized Case — the same idea, applied to each word without lowercasing the remaining letters.
- aLtErNaTiNg cAsE — alternates letter by letter. Used almost exclusively for sarcasm online.
Title case is not one rule
Style guides disagree about which words to capitalise. AP style capitalises words of four letters or more; Chicago capitalises everything except articles, coordinating conjunctions and prepositions regardless of length. So "A Guide to Writing" is correct Chicago, while AP would give you "A Guide To Writing".
The Title Case option here capitalises the first letter of every word, which is the simplest and most predictable behaviour. If you are writing to a specific house style, treat the output as a starting point and lowercase the small words yourself.
When case matters more than you would think
URLs are case-sensitive after the domain: /About and /about are two different pages to a web server, and serving both is a duplicate content problem. Email addresses are case-insensitive in the domain but technically case-sensitive before the @, though almost no provider enforces it.
In spreadsheets and databases, inconsistent case is the usual reason a lookup fails or a deduplication misses matches. Normalising a column to lower case before comparing is the standard fix.