Sentence Counter & Passive Voice Checker
Count sentences, find the average and longest sentence, and highlight passive voice in English text. Free online sentence counter that runs in your browser.
🔒 Runs entirely in your browser — nothing is uploadedCount sentences and measure their length
Sentence length is one of the strongest signals of how easy a text is to read. This sentence counter shows how many sentences your text contains, the total number of words, the average sentence length and the longest and shortest sentences, plus how many are questions and exclamations. A table below lists every sentence with its word count, its type and any passive construction it contains, so you can quickly find the one 45-word sentence that needs to be split. The table can be copied as CSV or Markdown.
Sentences are split at full stops, question marks, exclamation marks and ellipses followed by a space, and at line breaks, so headings and list items are counted separately. Quotation marks and brackets after the final punctuation stay with their sentence. As a rule of thumb, an average of 15 to 20 words per sentence reads comfortably for a general audience.
Highlight passive voice
In the passive voice the object of an action becomes the subject: "The report was written by the team" instead of "The team wrote the report". Overusing it makes writing wordy and vague, because the person doing the action is hidden or pushed to the end. The checker highlights passive constructions — a form of "be" or "get" followed by a past participle — including negatives and adverbs in between, such as "were not caught" or "is being built". The percentage card shows how many sentences contain at least one passive phrase.
The passive voice is not a mistake. It is the right choice when the actor is unknown, obvious or unimportant, and it is standard in some scientific and legal writing. Use the highlights as prompts to ask whether an active sentence would be clearer. Because the check is pattern-based, a few adjectives ending in -ed can still slip through; adjectives such as "tired", "interested" and "married" are excluded. For overall difficulty scores, try the Readability Score Checker.
Private
The analysis runs entirely in your browser, so unpublished drafts and confidential documents are never uploaded.
How to use
- Paste your textAdd an essay, article, report or email in English.
- Read the countsSee the number of sentences, words, average, longest and shortest sentence, questions and exclamations.
- Review passive voicePassive constructions are highlighted in the text and listed per sentence.
- ReviseRewrite flagged sentences in the active voice where it makes them clearer.