How to split text into one sentence per line
Proofreading, translation review and subtitle prep all get easier when every sentence sits on its own line. This tool rewrites pasted text one sentence per line and reports how many sentences it found, how long the longest one is and what the average length works out to.
Boundaries are detected at a period, question mark or exclamation mark — including the full-width forms — but only when the next character is the end of the text, whitespace or a Hangul syllable. Because of that rule 3.14 and example.com are never split, since a digit or a Latin letter follows the dot. Closing quotes and brackets that sit right after the punctuation stay with the sentence they belong to.
Common abbreviations are handled through an exception list. Mr., Mrs., Dr., Prof., etc., U.S., Inc. and Ltd., plus single capital initials such as the J. in a name, do not end a sentence. An abbreviation outside that list can still cause a wrong break, so skim the output and switch the exception option off if it gets in your way. This is a punctuation-based splitter, not a trained language model, so unusual formatting may need a manual touch-up. Everything runs in your browser.
Frequently asked questions
No. A boundary is only accepted when whitespace or a Hangul syllable follows the punctuation, so 3.14 and example.com stay intact because a digit or letter comes next.
By default they are treated as sentence boundaries too. Turn that option off and every break becomes a space before the text is re-split on punctuation alone.