Sentence Splitter
Free online sentence splitter. 100% client-side, no upload.
Loading tool...
What is Sentence Splitter?
The Sentence Splitter is a free online tool that breaks any block of text into individual sentences and outputs them as a clean one-per-line list. It recognizes 45+ common English abbreviations so their periods do not cause false splits, can treat line breaks as hard boundaries, and optionally numbers each sentence. Everything runs locally in your browser.
Key Benefits
- Prepare one-sentence-per-line data for LLM and NLP pipelines
- Turn dense paragraphs into scannable bullet lists
- Smart abbreviation handling prevents false splits on Mr., Dr., e.g.
- Live sentence, word, and character counts for readability checks
- 100% client-side and private - no upload, no signup, works offline
Common Use Cases
- •Preparing LLM training data and NLP corpora
- •Building slide bullet points from articles
- •Sentence-by-sentence translation workflows
- •Creating spaced-repetition flashcards from reading material
- •Readability editing and sentence-length analysis
How to Use the Sentence Splitter
- Paste your text: Paste or type the paragraph, article, or transcript you want to split into the input box.
- Choose your options: Keep abbreviation handling on so titles like Mr. and Dr. do not split early, enable line-break boundaries if each line is its own sentence, and turn on numbering if you want a numbered list.
- Review the split output: The tool instantly shows each sentence on its own line with live sentence, word, and character counts.
- Copy or download: Click Copy to grab the list for your clipboard, or Download to save it as a plain text file.
Key Features
- Splits on periods, exclamation and question marks, and ellipses with quote-aware boundaries
- Abbreviation protection for 45+ common English titles like Mr., Dr., Prof., and e.g.
- Optional line-break boundary mode for lists, lyrics, and subtitles
- Optional numbered output (1. 2. 3.) for citations and datasets
- Live sentence, word, character counts and longest-sentence stat
- Copy to clipboard or download as a plain text file, 100% client-side
Frequently Asked Questions
How does the Sentence Splitter decide where a sentence ends?
It splits on sentence terminators - periods, exclamation marks, question marks, and ellipses - when they are followed by whitespace and optionally a closing quote or bracket. When abbreviation handling is on, periods after common titles like Mr., Dr., Prof., e.g., and U.S. are ignored as boundaries.
Can it split text that has no punctuation?
Yes. Turn on "Treat line breaks as sentence boundaries" and each line becomes its own sentence. This works well for lyrics, subtitles, and lists where sentences are separated by newlines rather than periods.
Does it work with languages other than English?
The abbreviation list covers English titles and organizations, but the terminator rules (period, question mark, exclamation mark, ellipsis) work for most Latin-script and many other languages. Thai text without punctuation should use the line-break boundary mode.
Is my text uploaded to a server?
No. The splitting runs entirely in your browser with JavaScript, so your text never leaves your device. It also works offline once the page has loaded.
What can I use the one-sentence-per-line output for?
It is popular for preparing LLM and NLP training data, building bullet-point summaries, checking readability sentence by sentence, translating sentence by sentence, and creating spaced-repetition flashcards.