Sentence Case Converter — Convert Text to Sentence Case Online
What is Sentence case?
Sentence case is the standard capitalization format used in everyday written prose. In sentence case, only the first letter of the first word in a sentence is capitalized (along with proper nouns like names and places). Every other word remains lowercase, exactly as you would write a normal paragraph of text.
Sentence case mirrors natural spoken language rhythm. When you read sentence-case text, your eye moves smoothly through it without the visual "noise" of multiple capitalizations drawing attention away from meaning. This makes sentence case the most readable format for longer text passages.
Most everyday writing — emails, articles, chat messages, social media posts — uses sentence case by default. When you write naturally, you're almost certainly writing in sentence case. This converter helps you restore that natural format to text that has been improperly capitalized.
Example
| Input | Output (Sentence case) |
|---|---|
| THE QUICK BROWN FOX. JUMPS OVER. | The quick brown fox. Jumps over. |
How to Convert to Sentence case
- Paste or type your text — sentence case works best with full paragraphs and multi-sentence content.
- Click Sentence case in the options grid.
- Copy or download the result.
The converter lowercases all text first, then capitalizes the first letter after the start of the text and after each period followed by a space. Proper noun capitalisation must be re-added manually as the tool cannot automatically detect proper nouns.
When to Use Sentence case
Sentence case is the right choice for body text, paragraphs, descriptions, and any content that should read naturally. Use it when text has been incorrectly capitalised — for example, after pasting from a source that used ALL CAPS or Title Case where it wasn't appropriate.
It's also the preferred heading style for many modern brands, publications, and design systems that favor a conversational tone. Google's Material Design guidelines, for example, recommend sentence case for most UI elements.
Common Use Cases for Sentence case
- Correcting over-capitalized pasted text
- Writing body text and paragraphs
- UI labels and descriptions in modern design systems
- Social media captions and posts
- Email subject lines for a casual, approachable tone
- Restoring natural readability to ALL CAPS text
Frequently Asked Questions
What is sentence case?
Sentence case capitalizes only the first letter of the first word in a sentence, plus proper nouns. All other words remain lowercase, matching the convention used in everyday prose writing.
Does this tool automatically capitalize proper nouns?
No. Automatically detecting proper nouns (names, places, brands) requires complex linguistic analysis. The converter capitalizes sentence-starting letters only. You will need to manually re-capitalize proper nouns in your converted text.
When should I use sentence case instead of title case?
Use sentence case for body text, descriptions, and casual headings. Use title case for formal titles, book/article names, and contexts where editorial convention requires it. Many modern brands and design systems prefer sentence case for its natural, approachable feel.
What is the difference between sentence case and lowercase?
Lowercase converts every letter to small letters — no exceptions. Sentence case keeps the first letter of each sentence capitalized. Sentence case is readable and suitable for real text; lowercase is used primarily for technical contexts like file names and code.