Sentence Case Converter
Convert text to sentence case: capital first letter of every sentence, the rest lowercase, acronyms kept. Fixes ALL CAPS and messy text in one click. Free.
- No upload — 100% private
- Instant, on your device
- Free, no sign-up
- Works offline once loaded
How it works
How to use Sentence Case Converter
Paste text that is in ALL CAPS, all lowercase or mixed up.
Each sentence now starts with a capital letter and the rest is lowercase.
Leave “Keep acronyms” on to protect words like NASA or HTML, then copy the result.
Why use it
Why use our Sentence Case Converter tool
Knows where sentences end
Capitalises after full stops, question marks, exclamation marks and blank lines between paragraphs.
Protects acronyms and brands
Keeps NASA, PDF or iPhone as written, unless the whole text is in capitals and needs a full reset.
Rescues shouty text
Turns all-caps emails, notices and copied PDF text into normal, readable prose.
Edit before you copy
See the result live, adjust the input, and copy or download it when it looks right.
FAQ
Frequently asked questions
What is sentence case?
Sentence case writes text the way normal sentences are written: a capital letter at the start of each sentence and lowercase elsewhere, apart from names and acronyms.
Will it capitalise names like Ali or London?
Only when they start a sentence. Other words are lowercased, so re-capitalise names afterwards — no tool can know every name. All-caps acronyms such as NASA and brand casing such as iPhone are kept while that option is on.
When should I use sentence case vs title case?
Sentence case suits body text, captions, buttons and many modern headings. Title Case is traditional for book, article and film titles.
Does it work on several paragraphs?
Yes. Paragraphs and line breaks are kept, and each sentence in each paragraph is handled.
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