Category: Text
· URL: /tools/sentence-case-formatter.html
Privacy: runs locally in your browser. No uploads, no tracking scripts.
How to use
Use this tool to normalize capitalization without changing your spacing or punctuation.
- Paste or type your text in the input box.
- Choose options (acronyms, mixed-case words, new lines).
- Click Format to sentence case.
- Copy the output.
Keywords this page targets (natural cluster): sentence case formatter, sentence case converter, convert to sentence case, sentence case online, sentence case generator, sentence case tool, capitalize sentences, capitalize first letter of each sentence, lowercase then capitalize sentences, fix capitalization in text, format paragraphs to sentence case, sentence case for copywriting, sentence case for headings, sentence case vs title case, sentence case for reddit posts, sentence case for emails, make text sentence case, sentence case with quotes, sentence case from uppercase, sentence case from random caps
Secondary intents covered: Convert messy mixed-case text into readable sentence case, Capitalize the start of each sentence after . ! ?, Treat new lines as sentence breaks (for bullet-like text), Keep certain words unchanged (acronyms or brand-style mixed case), Clean up pasted content from PDFs, chats, or transcripts, Copy the formatted result quickly for reuse, Verify capitalization behavior using simple test examples, Reset the tool to start over
FAQ
What does “sentence case” mean?
It capitalizes the first letter of each sentence and lowercases the rest of the sentence.
Does it keep my spacing and punctuation?
Yes. It keeps your original whitespace and punctuation; it mainly changes letter casing.
Will it capitalize after . ! and ?
Yes. The tool starts a new sentence after those punctuation marks.
Can new lines start a new sentence?
Yes. Enable “Treat new lines as sentence breaks” to capitalize after each line break.
How can I prevent acronyms like NASA from becoming “Nasa”?
Turn on “Keep ALL CAPS words” to preserve words that are already fully uppercase.
Will it keep brand-style casing like iPhone or eBay?
Yes, if “Keep mixed-case words” is enabled, words that already contain both upper and lower case are left unchanged.
Is my text uploaded to a server?
No. Formatting runs locally in your browser and the tool does not make network requests.