Sentence Case Converter — Free Online Tool
Last updated: January 2025
What is Sentence Case Converter?
Sentence Case capitalizes only the first letter of the first word in each sentence, just like standard writing.
When to use Sentence Case Converter?
Use Sentence Case for body text, email copy, social media posts, descriptions, and any regular prose writing.
How to use this tool
- 1Paste your text in the input box
- 2Click 'Convert' to apply Sentence Case
- 3Copy the correctly capitalized result
Examples
| Input | Output |
|---|---|
| THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG. | The quick brown fox jumps over the lazy dog. |
| hello world. this is a test. | Hello world. This is a test. |
| MULTIPLE SENTENCES. EACH ONE STARTS WITH A CAPITAL. | Multiple sentences. Each one starts with a capital. |
| camelCase to sentence case example | Camelcase to sentence case example |
| WHY ARE YOU SHOUTING? I AM NOT SHOUTING! | Why are you shouting? I am not shouting! |
Rules & Behavior
- First word of each sentence is capitalized
- Rest of the text is lowercase
- Sentences are detected by . ! ? punctuation
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Frequently Asked Questions
What is Sentence Case?
Sentence Case is the standard capitalization used in prose writing — only the first letter of a sentence is capitalized, along with proper nouns.
How does sentence detection work?
The converter detects sentence boundaries using period, exclamation mark, and question mark punctuation, then capitalizes the next word.
Will it affect proper nouns?
Currently, the tool converts all non-sentence-start words to lowercase. You may need to manually re-capitalize proper nouns like names and places.
When should I use Sentence Case vs Title Case?
Use Sentence Case for body text, captions, and descriptions. Use Title Case for titles, headings, and subheadings in formal documents.
Does it work with multiple paragraphs?
Yes, the converter handles multiple paragraphs and sentences correctly.