Sentence Case Converter
This sentence case converter normalizes capitalization so that the first letter of every sentence is uppercase and the rest is lowercase. Paste paragraphs and the tool detects sentence boundaries after periods, exclamation marks, and question marks, including line breaks; common abbreviations are kept readable. It is useful for cleaning pasted text, fixing documents written in all caps, and preparing subtitles, notes, or CMS content. The live counters show characters, words, and lines while you edit, and the conversion is applied instantly. Everything runs client-side in JavaScript, so confidential drafts never leave your browser. Copy the result with a single click or clear the field to start over.
Converted Text
Overview
This sentence case converter normalizes capitalization so that the first letter of every sentence is uppercase and the rest is lowercase. Paste paragraphs and the tool detects sentence boundaries after periods, exclamation marks, and question marks, including line breaks; common abbreviations are kept readable. It is useful for cleaning pasted text, fixing documents written in all caps, and preparing subtitles, notes, or CMS content. The live counters show characters, words, and lines while you edit, and the conversion is applied instantly. Everything runs client-side in JavaScript, so confidential drafts never leave your browser. Copy the result with a single click or clear the field to start over.Formula
Sentence case: first letter of each sentence capitalizedFrequently asked questions
How are sentence boundaries detected? +
The converter treats a period, exclamation mark, or question mark followed by a space or line break as the end of a sentence and capitalizes the next letter.
Does it fix ALL-CAPS text? +
Yes. All-caps paragraphs are first lowercased and then re-capitalized at the start of each sentence, which makes long pasted text readable again.
Are abbreviations like "e.g." handled? +
Common short abbreviations are left in lowercase so the sentence is not split incorrectly, but unusual cases may still need a quick manual touch-up.
What text case conversions are available? +
This tool supports UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case, kebab-case, and more.
Can I convert text with special characters and accents? +
Yes. The tool preserves accented characters, special symbols, and non-Latin scripts during all case conversions.
Can I convert large amounts of text at once? +
There is no character limit. Paste any amount of text and the tool converts it instantly in your browser.
Does it handle programming naming conventions? +
Yes. The tool supports camelCase, PascalCase, snake_case, kebab-case, and SCREAMING_SNAKE_CASE for programming variable names.