Sentence Splitter

Sentence Splitter breaks continuous prose into individual sentences, placing each one on its own line so you can read, edit, or process them separately. Under the hood it uses a punctuation-based heuristic that looks for full stops, question marks, and exclamation marks, but it is smart enough to avoid splitting on the periods inside common abbreviations and decimal numbers, which naive splitters get wrong.

It is useful whenever sentence-level structure matters. Writers check sentence length and variety, translators and language learners work through a passage one sentence at a time, and anyone preparing text for analysis needs clean sentence boundaries. Instead of copying sentence by sentence, you paste a paragraph and immediately get a numbered list you can act on.

All processing runs locally in your browser using JavaScript, so nothing is uploaded and no account is required. Paste your text, decide whether to number the sentences, and read the one-per-line output plus a summary of how many sentences were found and their average length. Because the work stays on your device, private and unpublished text remains confidential.

Features

• Splits on sentence-ending punctuation — periods, question marks, and exclamation marks.
• Guards against common abbreviations like Mr., Dr., and e.g. to avoid false breaks.
• Skips the period inside decimal numbers such as 3.14 so figures stay whole.
• Optionally numbers each sentence for easy reference and reordering.
• Reports the sentence count and the average words per sentence.
• Outputs one sentence per line, ready to copy or export as text.
• Runs entirely in your browser so private prose stays confidential.

How to use Sentence Splitter

1. Paste the paragraph or passage you want to split into the input box.
2. Leave Number sentences on to prefix each line with its position.
3. Read the one-per-line output with each sentence on its own line.
4. Check the stats panel for the sentence count and average sentence length.
5. Scan the list to spot overly long or very short sentences.
6. Copy the result to your clipboard or download it as a TXT file.

Benefits

• Makes it easy to check sentence length and variety while editing.
• Helps translators and learners work through text one sentence at a time.
• Prepares clean sentence boundaries for further text analysis.
• Avoids the false splits that trip up simple period-based tools.
• Keeps unpublished writing private because nothing is uploaded.
• Turns a dense paragraph into an actionable, numbered checklist.

Sentence boundaries in natural language are genuinely ambiguous, which is why the tool combines several signals rather than splitting on every period. It checks whether the word before a period is a known abbreviation, whether the period sits between two digits, and whether the punctuation is followed by whitespace and a likely sentence start such as a capital letter or an opening quotation mark. This catches the most common cases that break simpler splitters.

No heuristic is perfect, so unusual formatting, uncommon abbreviations, or sentences ending in a quotation can occasionally be split slightly differently than you expect. Treat the output as an excellent starting point that you can nudge by hand if needed. The average-words-per-sentence stat is a handy readability signal: a high value often means sentences could be tightened, while a very low value can read as abrupt.