✍️ Case Converter
Type or paste your text, choose a case — output updates instantly. Non-destructive: your original is always preserved.
Choose a Case
Your Text
Case Reference
Click any row above to apply that case type.
What each of the eight transformations does
UPPERCASE and lowercase are straightforward: every letter is converted in one direction, and non-letters are untouched. Capitalized Case uppercases the first letter of every word with no exceptions, which is what most simple tools call title case.
Title Case is smarter. It lowercases the whole token first, capitalises the leading letter, then checks the word against a list of minor words such as articles and short conjunctions. Minor words are pushed back to lower case unless they are the first or last word of a sentence, which is the convention most style guides use for headlines.
Sentence case lowercases everything, then capitalises the first letter after a full stop, exclamation mark or question mark, and at the start of each line. Alternating case walks through the string flipping between lower and upper, counting only letters, so punctuation and spaces do not disturb the rhythm. Inverse case flips each letter individually, turning lower case to upper and upper to lower wherever it finds them.
Remove Extra Spaces leaves capitalisation alone. It collapses multiple consecutive spaces into one, trims leading and trailing whitespace from each line, and limits runs of blank lines to a single blank line.
Title Case is smarter. It lowercases the whole token first, capitalises the leading letter, then checks the word against a list of minor words such as articles and short conjunctions. Minor words are pushed back to lower case unless they are the first or last word of a sentence, which is the convention most style guides use for headlines.
Sentence case lowercases everything, then capitalises the first letter after a full stop, exclamation mark or question mark, and at the start of each line. Alternating case walks through the string flipping between lower and upper, counting only letters, so punctuation and spaces do not disturb the rhythm. Inverse case flips each letter individually, turning lower case to upper and upper to lower wherever it finds them.
Remove Extra Spaces leaves capitalisation alone. It collapses multiple consecutive spaces into one, trims leading and trailing whitespace from each line, and limits runs of blank lines to a single blank line.
One phrase through five different styles
Take the phrase the lord of the rings, typed entirely in lower case.
UPPERCASE returns THE LORD OF THE RINGS. Capitalized Case returns The Lord Of The Rings, capitalising all five words. Title Case returns The Lord of the Rings, because of and the are minor words sitting in the middle of the phrase, while The at the start is capitalised as the opening word and Rings is capitalised as an ordinary word. That single difference between Capitalized Case and Title Case is the reason both options exist.
Sentence case returns The lord of the rings, capitalising only the opening letter.
Now take a differently mangled input, hELLO wORLD, which is what happens when caps lock is on and you hold shift for the first letter. Inverse case flips every letter and returns Hello World in one step. Alternating case applied to hello world returns hElLo wOrLd, with the space skipped in the counting so the w continues the pattern from the o before it.
Finally, Remove Extra Spaces turns the input a b, with two spaces, into a b with one.
UPPERCASE returns THE LORD OF THE RINGS. Capitalized Case returns The Lord Of The Rings, capitalising all five words. Title Case returns The Lord of the Rings, because of and the are minor words sitting in the middle of the phrase, while The at the start is capitalised as the opening word and Rings is capitalised as an ordinary word. That single difference between Capitalized Case and Title Case is the reason both options exist.
Sentence case returns The lord of the rings, capitalising only the opening letter.
Now take a differently mangled input, hELLO wORLD, which is what happens when caps lock is on and you hold shift for the first letter. Inverse case flips every letter and returns Hello World in one step. Alternating case applied to hello world returns hElLo wOrLd, with the space skipped in the counting so the w continues the pattern from the o before it.
Finally, Remove Extra Spaces turns the input a b, with two spaces, into a b with one.
Picking the right style and checking the result
For headlines and titles, Title Case is normally what you want, but style guides differ on which words count as minor and on whether prepositions of four letters or more should be capitalised. If your house style disagrees with the output, fix the handful of affected words by hand rather than falling back on Capitalized Case, which will capitalise everything.
Be careful with sentence case and proper nouns. Because the transformation lowercases everything before recapitalising sentence openings, names, places and brands lose their capitals and will need restoring. The same warning applies to acronyms: NASA becomes Nasa under Title Case and nasa under Sentence case.
Alternating and inverse case are novelty styles. They are fine for emphasis in casual writing, but screen readers pronounce them unpredictably and they make text harder to scan, so keep them out of anything that needs to be read carefully.
Use the word and character counts to sanity check. Case changes should leave both counts identical; only the space cleanup option should reduce the character count.
Be careful with sentence case and proper nouns. Because the transformation lowercases everything before recapitalising sentence openings, names, places and brands lose their capitals and will need restoring. The same warning applies to acronyms: NASA becomes Nasa under Title Case and nasa under Sentence case.
Alternating and inverse case are novelty styles. They are fine for emphasis in casual writing, but screen readers pronounce them unpredictably and they make text harder to scan, so keep them out of anything that needs to be read carefully.
Use the word and character counts to sanity check. Case changes should leave both counts identical; only the space cleanup option should reduce the character count.
Frequently Asked Questions
Capitalized Case capitalises the first letter of every word without exception. Title Case follows editorial convention and leaves minor words such as a, an, the and and in lower case unless they fall at the start or end of a sentence. The Lord of the Rings is Title Case; The Lord Of The Rings is Capitalized Case.
Yes, it will lowercase them. Sentence case starts by lowercasing the entire text, then restores capitals only at sentence openings and line starts. Names, places, brands and acronyms will need correcting afterwards. If your text is rich in proper nouns, expect to do some manual tidying.
No. Remove Extra Spaces is a whitespace-only cleanup. It collapses runs of multiple spaces into a single space, trims whitespace from the start and end of each line, and reduces consecutive blank lines to one. Every letter keeps the case it already had.
They are a quick integrity check. Any pure case conversion should leave both the word count and the character count identical between input and output, since only letter forms change. A different character count after a case conversion means whitespace was altered, which is the intended behaviour only for the cleanup option.
It ignores them when counting. The alternation advances only on letters, so a space or a comma does not consume a turn in the lower-upper-lower sequence. That keeps the visual rhythm consistent across word boundaries instead of resetting awkwardly after every punctuation mark.