Sentence Case Converter
Fix text typed in capitals or without any capitals. Everything is lowercased, then the first letter of each sentence is capitalised.
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How the Sentence Case Converter works
The text is lowercased, then the first letter after a full stop, exclamation mark, question mark or ellipsis is capitalised, as is the first letter of the text. Opening quotes and Spanish ¿ ¡ marks are skipped so “¿qué tal?” becomes “¿Qué tal?”. Optionally every line also starts with a capital.
Periods after common abbreviations (Mr., Dr., e.g., i.e., vs.) and inside decimal numbers do not start a new sentence. The English pronoun “I” and its contractions (I’m, I’ll, I’ve, I’d) are capitalised when that option is on, without touching “i.e.” or hyphenated words like “i-phone”.
Because everything is lowercased first, names and acronyms lose their capitals: “london” stays “london”. Turn on “Keep words already in ALL CAPS” to protect acronyms in mixed-case text, and capitalise names by hand afterwards.
How to use it
- Paste the text you want to fix.
- Choose whether each line should start with a capital and whether to capitalise “I”.
- Copy the result and capitalise names and brands manually.
Example
Caps Lock text becomes normal sentences, and “Dr.” does not start a new one.
Input
HELLO THERE. I THINK i'm LATE! SEE DR. SMITH AT 3.30? yes.
Result
Hello there. I think I'm late! See dr. smith at 3.30? Yes.
Frequently asked questions
Why are names lowercased?
A tool cannot tell “Paris” the city from “paris” the word without a dictionary, so it lowercases everything. Re-capitalise proper nouns by hand, or use acronym protection when only acronyms are involved.
Does it handle languages other than English?
Yes for sentence starts in any cased alphabet, including accented letters and Spanish inverted marks. Only the pronoun “I” rule is English-specific; turn it off for other languages.
Can I capitalise only after full stops and not after every line?
Yes. Turn off “Start every line with a capital” and only sentence ends will trigger a capital.