Sentence Analyzer
Analyze sentence structure and length in one click — perfect for spotting run-ons and balancing rhythm.
What is Sentence Analyzer?
All long sentences feel exhausting. All short ones feel choppy. Good writing varies length deliberately.
Paste your text and see sentence count, average length, longest and shortest at a glance.
If you're editing fiction, you find run-ons that need breaking. If you're writing for the web, you confirm short-sentence pacing. If you're auditing copy, you compare your draft against best-practice rhythm.
How to use Sentence Analyzer
Four steps. No setup, no signup.
Step 1
Paste your text
Step 2
See sentence statistics
Step 3
Spot overly long or short ones
Step 4
Edit for rhythm
Example
Sentence stats from a short paragraph.
Input
Toolkno is fast. It works in your browser without any signup or upload, which keeps your text private.
Output
Sentences: 2 Average length: 11 words Longest: 18 words Shortest: 3 words
Why Sentence Analyzer is useful
- ✓
Find run-ons by spotting your longest sentence first.
- ✓
Confirm short-sentence pacing for mobile-friendly web copy.
- ✓
Compare drafts to see how editing tightened rhythm.
- ✓
Pairs with Readability Checker for grade-level context.
Common questions
Ideal sentence length?
15-20 words on average works for most writing.
Tip: Mix short and long for rhythm.
What stats does it show?
Count, average length, longest and shortest.
Tip: Click the longest to spot run-ons.
What about web writing?
Aim for sub-25-word sentences for online readability.
Tip: Mobile readers bail on long sentences.
How does it detect sentences?
By terminal punctuation: periods, !, ?
Tip: Abbreviations like 'Mr.' may cause false splits.
Last reviewed: April 2026 · Free, browser-based, no signup.
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