Longest Sentence Finder
Paste your text to see every sentence ranked by length. Find the ones that need breaking up and check your average sentence length against readability targets.
Why Sentence Length Matters for Readability
Sentence length is one of the strongest predictors of readability. Long sentences force readers to hold more information in working memory before reaching the main point. They increase cognitive load, slow reading speed, and reduce comprehension — especially on screens and mobile devices where readers scan rather than read linearly.
Research on readability and plain language writing consistently finds that the ideal average sentence length for general audiences is 15–20 words. Academic writing averages 20–25 words. Sentences over 30 words are difficult for most readers. Sentences over 40 words are nearly always too complex and should be split.
Ideal Sentence Length by Audience
| Audience / Context | Target avg length | Max comfortable length |
|---|---|---|
| General web content / blog | 14–18 words | 25 words |
| News articles / journalism | 15–20 words | 28 words |
| Academic / research papers | 20–25 words | 35 words |
| Legal / technical documents | 22–30 words | 50 words |
| Marketing copy / emails | 10–14 words | 20 words |
How to Fix Long Sentences
When the tool identifies a sentence over 25–30 words, use one of these techniques:
- Split at a conjunction — Break at "and", "but", "or", "because", "which", "that" to form two complete sentences.
- Convert a clause to a new sentence — Relative clauses ("which has been shown to…") often stand alone as follow-up sentences.
- Use a colon or dash — Replace a long clause with a colon or em dash for a shorter main clause plus a dependent elaboration.
- Remove qualifiers — Long sentences often contain redundant hedges ("it could be argued that", "in many cases") that can be cut entirely.
- Switch to active voice — Passive constructions are consistently longer than active equivalents.
Vary Sentence Length for Rhythm
Ideal writing is not uniformly short. A paragraph of only 8-word sentences reads as choppy and simplistic. The goal is a mix — shorter sentences for emphasis and rhythm, longer sentences to develop ideas — with the average staying under 20 words. After using this tool to find outliers above 30 words, run the readability checker to confirm the overall Flesch score improves after editing.
How the Longest Sentence Finder Works
Paste your text into the left panel. A stats bar appears above both panels showing four headline metrics: total sentence count, average words per sentence, the word count of the longest sentence, and the word count of the shortest sentence. The stats bar is hidden when the input is empty and reappears as soon as text is entered.
The right panel lists every sentence in your text sorted longest first — the sentence with the most words appears at the top. Each row shows the sentence's rank number (#1, #2, …), its word count, and a colour-coded badge: Long (red) for sentences of 30 words or more, and Short (blue) for sentences of 8 words or fewer. Sentences between those thresholds show no badge.
Use the Clear button in the input panel header to reset both panels and return to the empty state. For a more complete sentence analysis — including average words per sentence, sentence variety score, and an inline highlight view — use the sentence counter. Read our guide on ideal sentence length for readability.
Longest Sentence Finder FAQ
Common questions about finding and fixing long sentences.
The longest sentence finder ranks all sentences in your text by word count, showing the longest at the top. It also shows the shortest sentence, average sentence length, and total sentence count. Use it to identify sentences that need breaking up for better readability.
Very long sentences are harder to process — readers must hold more information in working memory before reaching the verb or conclusion. Most readability guidelines recommend keeping average sentence length under 20 words and avoiding single sentences longer than 40 words in general web content.
For general web and blog content, aim to keep most sentences under 25 words. Sentences over 40 words should be reviewed for possible splitting. Academic and legal writing routinely uses longer sentences, but web content benefits from tighter structure.
Yes — completely free, no account required. Paste any length of text and get instant results in your browser.
The sentence counter shows aggregate statistics — total sentences, averages, variety score. The longest sentence finder shows individual sentences ranked by length, which makes it easier to find and fix specific problematic sentences.
Look for conjunctions (and, but, because, which) and turn them into sentence breaks. Separate dependent clauses. Remove redundant phrases. One idea per sentence is the simplest rule for keeping sentences short and clear.