Sentence case means only the first letter of each sentence is a capital, as in ordinary prose: "THE REPORT IS READY." becomes "The report is ready." Paste text and it is converted as you type.
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The converter lowercases the whole text, then capitalizes the first letter of each sentence and of each line. Line starts matter because lists, headings and table cells rarely end with a period, but each item still needs a capital. The English pronoun “i” becomes “I” wherever it stands alone or in a contraction.
Typical text that needs this:
Sentence-case headings (“How to reset your password”) are now the default in most product writing because they are quicker to scan and avoid arguments about which small words to capitalize. If you use them, apply them consistently: navigation, buttons, page titles and email subject lines in the same style. For the opposite direction, the title case converter applies English headline rules.
Sentence case is the capitalization of normal sentences: the first word starts with a capital, the rest are lowercase except proper nouns and the pronoun "I". "How to write a cover letter" is sentence case; "How to Write a Cover Letter" is title case.
Both are correct; pick one and use it everywhere. Many style guides for websites and apps, including the GOV.UK, Google and Microsoft style guides, use sentence case for headings because it reads faster. Newspapers and book titles in English traditionally use title case.
A new sentence starts after a period, question mark, exclamation mark or ellipsis followed by a space, and at the start of every line. The abbreviations e.g., i.e. and vs. do not end a sentence, so the next word stays lowercase. "etc." is treated as a sentence end, because it often is one; if it falls mid-sentence, lowercase the next word by hand.
The converter cannot tell a name from an ordinary word: "monday", "london" and "nasa" all look like plain words. Read through the result and restore capitals for names, days, months, brands and acronyms. The pronoun "I" is fixed automatically, including in "I'm" and "I've".
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