How to use the Sentence Case Converter
Convert to sentence case in three steps:
1
Paste your text
Paste text with any capitalisation issue — ALL CAPS, Random Caps, TiTlE CaSe — into the input box.
2
Click Convert
Press 'Convert to Sentence case' to lower-case everything and then capitalise the first letter of every detected sentence.
3
Review and copy
Check the output for proper nouns that may need manual re-capitalisation, then copy or download the result.
When to use this tool
Use the sentence case converter to fix or normalise text capitalisation:
- →Fixing ALL CAPS text copied from legacy systems, PDFs, or old databases
- →Normalising inconsistently capitalised user-generated content before publishing
- →Converting title-cased body copy back to standard sentence flow for readability
- →Preparing text exports from systems that store data in uppercase for UI display
- →Cleaning up meeting notes or transcripts where capitalisation is erratic
- →Standardising large blocks of text from multiple authors into a consistent style
Frequently asked questions
Q:How does the converter detect sentence boundaries?
The converter identifies sentence endings at periods (.), exclamation marks (!), and question marks (?) followed by whitespace. The character immediately following that whitespace is then capitalised. Abbreviations with periods (e.g. 'Dr.', 'U.S.') may occasionally cause false sentence breaks — review those manually.
Q:What happens to proper nouns like names and places?
Proper nouns will be lowercased unless they appear at the start of a sentence, since the converter cannot automatically identify names. After converting, you should scan the output and manually re-capitalise names, brands, acronyms (NASA, API), and other proper nouns.
Q:Can it fix text that was accidentally typed in ALL CAPS?
Yes — this is one of the most common uses. Paste the ALL CAPS text, click Convert, and the result will be properly sentence-cased. If you only need simple lowercase without sentence capitalisation, use the Lowercase Converter tool instead.
Q:Does it work on multiple paragraphs at once?
Yes — paste as many paragraphs as you need. The converter processes the entire input in one pass, detecting sentence boundaries across all lines and paragraphs.
Q:Will it affect text inside quotation marks or parentheses?
The converter applies the same sentence-boundary logic throughout the entire text, including inside quotes and parentheses. If a quoted sentence starts with a capital letter in the source, it will be capitalised after conversion only if it follows a sentence-ending punctuation mark.
Q:What is the difference between sentence case and lowercase?
Lowercase converts every letter to small case with no exceptions (e.g. 'Hello World' → 'hello world'). Sentence case converts to lowercase but then capitalises the first letter of each sentence (e.g. 'HELLO WORLD. HOW ARE YOU.' → 'Hello world. How are you.'). Sentence case is for readable body text; lowercase is for data normalisation.