Sentence Counter
Use the CaseSwitch Online Sentence Counter to measure sentences, words, characters, paragraphs, and lines in a paste. Drop in an essay or caption, read the statistics panel, and adjust until you hit the brief. Counting runs in this browser — nothing is uploaded.
Written by the CaseSwitch editorial team. We maintain these tools in the browser so drafts, keys, and images stay on your device.
Last reviewed: 23 July 2026
Processed locally in your browser. Nothing is sent to a server.
Paste or type text to convert. Output stays empty until there is input.
Character count: 0 · Word count: 0 · Line count: 0
Examples
Three sentences
Input
Hello world. How are you? Fine!
Output
Sentences: 3 Words: 6 Characters: 31 Characters (no spaces): 26 Paragraphs: 1 Lines: 1
Abbreviation can split sentences
Input
Dr. Smith arrived.
Output
Sentences: 2 Words: 3 Characters: 18 Characters (no spaces): 16 Paragraphs: 1 Lines: 1
Empty input
Input
Output
Sentences: 0 Words: 0 Characters: 0
Paragraph break
Input
One. Two three.
Output
Sentences: 2 Words: 3 Characters: 16 Characters (no spaces): 13 Paragraphs: 2 Lines: 3
One sentence without terminal punctuation
Input
Only one sentence here
Output
Sentences: 1 Words: 4 Characters: 22 Characters (no spaces): 19 Paragraphs: 1 Lines: 1
How to use
- Paste the essay, email, or caption into the input panel.
- Read Sentences, Words, Characters, Characters (no spaces), Paragraphs, and Lines on the right.
- Edit the source and watch the statistics update before you submit or publish.
What this tool is for
Assignments, captions, and briefs often come with length targets. This page estimates sentence count from punctuation, counts words on whitespace, and reports characters with and without spaces plus paragraphs and lines. It is a measurement tool, not a grammar checker and not a readability-formula suite beyond these raw totals.
How it works
After trim, empty input reports zeros for sentences, words, and characters. Otherwise sentences are estimated with a pattern that takes runs ending in `.` `!` or `?`, plus a final run without terminal punctuation. Words split on whitespace. Characters use the trimmed length; a second figure strips whitespace. Paragraphs split on blank lines; lines split on newline. Abbreviations such as “Dr.” can inflate the sentence count because the period looks like a boundary.
When to use it
School assignments, social captions with limits, checking whether a paragraph is too long, comparing two drafts, and getting a quick structure snapshot before you open a full word processor.
When not to use it
Do not treat the count as legally binding for a contract’s “not more than X sentences.” Do not use it as a grammar or plagiarism checker. For per-word rankings, use the Word Frequency Counter or the Word Cloud.
How it compares to related tools
The Word Frequency Counter adds a ranked token table. The Word Cloud sketches the same frequencies as text markers. Sentence Case changes capitals; it does not count. This page is measurement, not transformation.
Common mistakes
Counting “Dr. Smith arrived.” as two sentences and panicking. Comparing totals to Microsoft Word, which uses different rules for hyphenation and footnotes. Ignoring that character counts include punctuation. Pasting with leading/trailing spaces and forgetting the tool trims before measuring.
Abbreviations and edge cases
Periods inside abbreviations, ellipses, and list items confuse simple sentence splitters — including this one. “Dr. Smith arrived.” reports two sentences here. If your instructor requires Microsoft Word’s counter, use Word for the official number and this page for quick drafts. Ellipses and `!?` combos may also disagree with other products.
Characters, paragraphs, and lines
Characters include letters, digits, and punctuation in the trimmed string. Characters (no spaces) delete whitespace only. Paragraphs are blocks separated by blank lines. Lines count newline-separated rows, so a two-paragraph paste with one blank line between can show three lines. Empty input short-circuits to a compact zero report without the full label set for characters-no-spaces in the zero path — the tool still shows Sentences/Words/Characters at zero.
Frequently asked questions
Why doesn’t the sentence count match Word?+
Products disagree on abbreviations, ellipses, and list items. Use one tool consistently for a deadline, or follow your instructor’s software.
Are characters with spaces included?+
Yes. Characters is the trimmed length including spaces. Characters (no spaces) strips whitespace for the second figure.
Does a heading without a period count as a sentence?+
A final run without `.` `!` or `?` still counts as one sentence when the input is non-empty.
How are paragraphs detected?+
Blocks separated by blank lines (newline, optional whitespace, newline) count as paragraphs.
Is this a readability scorer?+
No. You get raw counts only — not Flesch scores or grade levels.
Is my text uploaded?+
No. Counting runs in this browser. Nothing is sent to a server.
Does CaseSwitch upload this text?+
No. Conversion, cleaning, and counting for this page run in your browser. Drafts are not sent to CaseSwitch for processing.
Related guides
Read our original articles on this topic.
Related tools
Word Frequency Counter
Checking an essay against a word limit, counting characters for a caption or meta description, spotting a word you used too often, comparing two drafts by pasting them one after the other, and preparing a keyword list after you have already written the copy (not the other way around). The [Sentence Counter](/online-sentence-counter/) is a sibling if you only want the totals without a frequency table. The [Word Cloud](/word-cloud-generator/) is a text ranking of the same counts, not a picture.
Text Frequency Cloud
Skimming a long interview, spotting repeated talking points, teaching frequency without a design tool, and getting a fast visual before you open the full frequency table.
Whitespace Remover
Cleaning CSV cells, tightening pasted UI copy, normalizing Slack or email spacing before a character count, and preparing text for a case converter or duplicate-line pass when padding would create false unique lines.
Duplicate Word Finder
Editing blog posts, reviewing ads copy, checking whether a product name is overused, hunting accidental double words, and tightening a paragraph before a character limit. Pair with the [Word Frequency Counter](/word-frequency-counter/) when you also need singles and a full ranked list.
Sort Words Alphabetically
Tag lists, glossary drafts, comparing two versions of a keyword set, preparing alphabetical credits, and stabilizing a permission list before diff.