Sentence Case Converter

What Is Sentence Case?

Sentence case capitalises only the first letter of the first word in each sentence, plus any proper nouns. Everything else is written in lowercase. It is the default capitalisation style for everyday prose — the way this paragraph is written right now. The result reads naturally and is the least visually intrusive of all the capitalisation styles.

Sentence Case vs. Title Case

The most common source of confusion is knowing when to use sentence case versus title case. A useful rule of thumb:

• Title case is for the titles of standalone works — books, films, albums, blog post headlines, and formal document headings.
• Sentence case is for body copy, UI labels, subheadings within a document, and anywhere the text should blend into the reading flow rather than shout.

Many modern style guides — including those from Google, Apple, and Microsoft — now prefer sentence case for UI copy (button labels, menu items, form field labels) over title case, because it feels less formal and is easier to read in a conversational interface.

Common Uses for Sentence Case

Blog Posts and Articles

Most editorial teams write body paragraphs in sentence case. Even subheadings within long-form articles often use sentence case rather than title case, especially in publications that follow AP or Guardian style. When you copy text from a source that used excessive capitalisation — such as an old press release — pasting it into this converter and applying sentence case produces clean, readable prose.

Emails and Business Writing

Professional emails are written in sentence case. Sending a message where every word is capitalised looks aggressive or careless. If you draft email templates in a tool that does not manage capitalisation automatically, you can paste the subject line or body here to normalise the casing before sending.

UI Copy and Product Interfaces

As mentioned, most major tech companies have shifted to sentence case for interface text. Buttons say “Save changes” rather than “Save Changes.” Error messages say “Something went wrong” rather than “Something Went Wrong.” This makes the product feel more natural and human. This converter is useful when auditing an existing UI for inconsistent capitalisation.

APA and MLA Reference Lists

Both APA (7th edition) and MLA (9th edition) use sentence case for the titles of articles, books, and book chapters in reference lists and works cited pages — even though those same titles might appear in title case on the cover of the original work. Only proper nouns and the first word after a colon are capitalised. This is a frequent source of errors when formatting academic bibliographies, and a sentence case converter provides a fast first pass before manual review.

Social Media and Chat

Social media captions, chat messages, and comment text all conventionally use sentence case. Typing in all caps reads as shouting; typing in all lowercase can feel informal or lazy in professional contexts. Sentence case is the neutral, universally readable default.

How to Use This Sentence Case Converter

Paste your text into the input box. The converter capitalises the first letter of each sentence and lowercases all other letters. Proper nouns will need to be reviewed manually after conversion, as the tool cannot determine context. Copy the result with one click.