Text tools

Sentence and Paragraph Counter

Count sentences and paragraphs and inspect averages and longest sections.

Processed locally in your browser. Your input is not uploaded to our server.

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How to use Sentence Counter

  1. Paste prose or select a local text or Markdown file.
  2. Review sentence and paragraph totals, averages, and longest-section details.
  3. Edit unusually dense sections and compare the recalculated structure.

Supported behavior

Sentence and Paragraph Counter describes the structure of prose rather than only its total length. Sentence boundaries come from Intl.Segmenter where the browser supports it, with a punctuation-based fallback that recognizes periods, exclamation marks, question marks, and common full-width equivalents. Segments made only of punctuation or whitespace are ignored. Paragraphs are non-empty blocks separated by one or more blank or whitespace-only lines after line endings are normalized. Alongside the two main counts, the tool calculates average words per sentence, average sentences per paragraph, and identifies the longest sentence and paragraph by word count. Those measures can expose dense passages or uneven document structure before editing. Pasted text and local .txt or .md files are analyzed only on your device and are never uploaded. Sentence detection is deliberately presented as an estimate because abbreviations, initials, dialogue, and language-specific conventions can make a punctuation boundary ambiguous; paragraph boundaries are deterministic under the stated blank-line rule.

  • Abbreviations such as “Dr.” and unusual dialogue punctuation can cause approximate sentence boundaries.
  • A visual line break alone does not start a new paragraph unless a blank line separates the blocks.

Examples

                One short sentence. Another one!

A final question?

Result: 3 sentences; 2 paragraphs; 1.5 sentences per paragraph

                Alpha.
   
Beta.

Result: 2 sentences; 2 paragraphs

Common use cases

  • Assess paragraph balance in an essay or report.
  • Find overlong sentences before a readability review.
  • Count translated paragraphs against a source document.

Frequently asked questions

What separates two paragraphs?

One or more blank lines, including lines containing only whitespace, separate non-empty paragraph blocks.

Does an exclamation mark create a sentence?

It can end a sentence, but a segment containing only punctuation is not counted.

How is the longest sentence chosen?

Detected sentences are compared by their word counts, not by raw character length.

Why is sentence counting described as estimated?

Punctuation can represent abbreviations or other non-terminal uses, and no automatic boundary detector resolves every language convention.