What is sentence case?

Sentence case capitalizes the first letter of each sentence and keeps the rest of the text in normal lowercase form unless proper nouns require capitalization.

Does this preserve punctuation?

Yes. The converter changes letter case while leaving punctuation and line breaks in place.

Can I use this for paragraphs?

Yes. You can paste one sentence or a larger block of text.

Quick Tool Labs

Sentence Case Converter

Use this sentence case converter to make the first letter of each sentence uppercase while normalizing the rest of the text.

Converter

Text to convert

Sentence case output

Paste text above to convert it to sentence case.

How this sentence case converter works

This tool lowercases the text, then capitalizes the first letter after the start of the text or after sentence-ending punctuation.

Sentence case = First letter of each sentence capitalized, remaining text normalized

Use it for email drafts, paragraph cleanup, AI-generated copy, notes, and any text that needs a more natural sentence style.

Examples

Example 1

hello world. this is a test. becomes Hello world. This is a test.

Example 2

All-caps or inconsistent text can be smoothed into a more readable sentence-style format.

Example 3

Sentence case is common for paragraphs, email content, and general-purpose writing.

Frequently asked questions

Does this fix proper nouns?

No. It applies general sentence-case rules, so names and brand capitalization may still need manual review.

Will punctuation stay in place?

Yes. Punctuation and line breaks remain in the text while the letter case changes.

Can I use this for longer paragraphs?

Yes. You can paste short or long blocks of text and convert them in one step.