Sentence Case Converter Online
Sentence case capitalizes only the first word of each sentence and leaves everything else lowercase, exactly like standard written English. It is the capitalization style used by Google, Apple, Microsoft, and most modern software interfaces. Paste your text above and it converts instantly. Nothing is uploaded.
Related case converters
How sentence case converter works
Paste your text into the input panel and it converts to sentence case automatically. Turn off auto-run and hit convert manually if you prefer to control when the conversion runs. Each sentence in your text gets its first letter capitalized, and everything else is set to lowercase.
What sentence case actually means
Sentence case formats text the same way a standard English sentence is written. The first letter of the first word is uppercase. Everything else is lowercase unless it would be capitalized in normal writing.
A heading like “THE BEST TOOLS FOR CONTENT WRITERS” becomes “The best tools for content writers.” A mixed-case heading like “Why Content Teams Use Title Case For Headlines” becomes “Why content teams use title case for headlines.” Only the first word and words that are always capitalized in standard writing get an uppercase letter.
What always stays capitalized
The first word of every sentence is capitalized regardless of what word it is. After a period, question mark, or exclamation mark, the next sentence starts with an uppercase letter.
Proper nouns stay capitalized. Names of people (Marie Curie), places (New York), companies (Google), and specific products (iPhone) keep their uppercase letters because they are always capitalized in standard English writing. The converter preserves these rather than forcing them to lowercase.
The pronoun “I” is always uppercase in English. A sentence like “i told him i would be late” becomes “I told him I would be late.” Every standalone “I” gets capitalized regardless of its position in the sentence.
Sentence case vs Title Case
Title Case capitalizes all major words in a heading. Sentence case capitalizes only the first word. Both are standard, but they belong in different contexts.
Title Case is traditional in print publishing, book titles, and news headlines in American English. Sentence case is the current standard in digital product interfaces, software documentation, and modern web content. Google’s Material Design guide, Apple’s Human Interface Guidelines, and Microsoft’s Writing Style Guide all specify sentence case for UI labels, headings, and buttons.
In academic writing, the distinction follows the style guide. APA uses sentence case for titles in reference lists. MLA and Chicago use Title Case for works cited entries. Most blog content goes either way depending on the publication’s style guide, but sentence case is gaining ground as the default in modern digital content. The title case converter handles the opposite conversion if you need to switch between the two.
Where sentence case is used
Product interfaces use sentence case almost universally now. Navigation labels, modal titles, button text, form labels, error messages, and settings pages in virtually every major software product follow sentence case. If you are building or reviewing UI copy and need to normalize a list of labels, converting here is faster than editing each one individually.
News headlines in British and Australian English almost always use sentence case. The BBC, The Guardian, and most non-American English-language news outlets write headlines as sentences rather than capitalizing every major word.
Academic reference lists in APA format require sentence case for the titles of papers, books, and articles. Only the first word of the title, the first word after a colon, and proper nouns are capitalized. Checking a reference list by eye is slow. Converting each title here takes seconds.
Email subject lines occasionally use sentence case for a more conversational tone. Some marketing teams run A/B tests between Title Case and sentence case subject lines. Converting a batch of variants here produces both formats without retyping. For all ten case formats from a single input, the case converters hub runs every format at once.