What is Sentence case?
Sentence case capitalizes the first letter of each sentence and leaves the rest in lowercase, except for proper nouns. It's the everyday capitalization of running prose — the way you write a paragraph.
Compared to title case, sentence case is quieter, less formal, and easier to read at a glance. It's increasingly popular for UI headings, marketing body copy, and friendly product writing where title case feels too shouty.
When to use Sentence case
- Body paragraphs — virtually all running prose.
- Modern UI headings — Apple, Google, Microsoft all use sentence case for most interface labels.
- Captions and figure labels.
- Subtitles and second-level headings where title case would feel heavy.
- Friendly marketing copy — sentence case feels conversational, title case feels formal.
- Academic reference list entries — APA reference lists use sentence case for article and book titles.
How Sentence case conversion works
- The very first letter of the input is capitalized.
- The first letter after a period, question mark, or exclamation mark followed by whitespace is capitalized.
- All other letters become lowercase.
- Proper nouns (iPhone, NASA, JavaScript) are restored to their canonical form when the proper-noun dictionary is enabled.
Worked examples
| Input | Sentence case |
|---|---|
hello world. how are you? |
Hello world. How are you? |
THE BIG SHOUT. THIS NEEDS CALMING DOWN. |
The big shout. This needs calming down. |
first sentence. second sentence! third sentence? |
First sentence. Second sentence! Third sentence? |
Related case formats
Title Case
→ Convert text to Title Case
lowercase→ Convert text to lowercase
Capitalized Case→ Convert text to Capitalized Case
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