Sentence Case Converter
Convert text to sentence case online. Capitalises the first letter of every sentence and lowercases the rest — ideal for fixing all-caps text.
A sentence case converter capitalises the first letter of each sentence and lowercases everything else, exactly as normal prose is written. Sentence boundaries are detected from full stops, question marks, and exclamation marks.
Examples
| Input | Output |
|---|---|
| THIS IS A SENTENCE. AND HERE IS ANOTHER! | This is a sentence. And here is another! |
| i went home. i slept. | I went home. I slept. |
When to use the sentence case converter
Sentence case is the default for body text in every language that uses the Latin alphabet, so most of the time you reach for this tool to repair text rather than to style it — recovering a paragraph typed in all caps, or normalising copy pasted out of a spreadsheet.
It is also increasingly the house style for interface text. Google's Material Design, Apple's Human Interface Guidelines, and most modern design systems specify sentence case for buttons, headings, menu items, and form labels. The reasoning is practical: sentence case scans faster, translates more cleanly into languages with different capitalisation rules, and keeps proper nouns visually distinct.
The one thing an automated converter cannot do is recognise proper nouns. Converting "I VISITED PARIS IN JUNE" gives you "I visited paris in june" — the tool restores the pronoun "I", but "Paris" and "June" have to be fixed by hand. Read the output before you ship it.
Frequently asked questions
Does the sentence case converter fix proper nouns?
No. Names of people, places, brands, and months are lowercased along with everything else, because a converter cannot reliably tell a proper noun from a common one. The standalone pronoun "I" is the one exception it restores.
How does it detect where a sentence ends?
It capitalises the letter following a full stop, question mark, or exclamation mark plus whitespace. Abbreviations such as "Dr." or "e.g." will therefore trigger a capital on the next word.
What is the difference between sentence case and title case?
Sentence case capitalises only the first word of each sentence. Title case capitalises every major word in a headline. Use sentence case for paragraphs and UI text, title case for titles of works.