Free Readability Checker
Analyze your text's readability with Flesch-Kincaid scoring. Get grade level, reading ease score, and clear interpretation.
Check Readability in 3 Simple Steps
Analyze and improve your text's readability instantly
Paste Your Text
Copy any text into the editor - blog posts, essays, emails, or marketing copy you want to analyze for readability.
Get Your Score
The tool calculates your Flesch-Kincaid reading ease score and grade level instantly using proven readability formulas.
Improve Your Writing
Use the score and interpretation to simplify complex text, shorten sentences, and make your writing more accessible.
Why Use SupWriter's Readability Checker?
Understand and improve your writing's clarity with proven readability metrics
Flesch-Kincaid Score
Get the industry-standard Flesch-Kincaid reading ease score from 0-100. Higher scores mean easier-to-read text.
Grade Level Analysis
See the U.S. school grade level required to understand your text. Aim for grade 7-8 for general audiences.
Clear Interpretation
Get a plain-English interpretation of your score: Very Easy, Easy, Standard, Difficult, or Very Difficult.
Syllable Counting
Uses intelligent syllable counting heuristics to analyze word complexity and its impact on readability.
Actionable Insights
Understand exactly how to improve your readability score with clear guidance based on your results.
Instant Analysis
Get results in real-time as you type. No server requests, no waiting, no sign-up required.
Frequently Asked Questions
More Writing Tools
Explore more free tools to improve your writing
Word Counter
Count words, characters, sentences, and paragraphs with reading and speaking time estimates.
Try it freeGrammar Checker
Fix grammar, spelling, and punctuation errors instantly with AI-powered correction.
Try it freeFlesch-Kincaid Readability Score Guide
Understand Flesch-Kincaid scores and how to use them to improve your writing clarity.
Try it freeHow to Improve Writing with Readability Checkers
Learn actionable tips to improve your readability scores and write clearer content.
Try it freeWriting Level Checker Tools
Discover the best writing level checker tools and how they analyze your content.
Try it freeAI Humanizer
Transform AI-generated text into natural, human-like content that bypasses AI detectors.
Try it freeTested and Proven Across All AI Detectors
We test every rewrite against leading detection tools like GPTZero, Turnitin, ZeroGPT, and more. Our system is updated weekly to adapt to new detection methods and eliminate flagged patterns.
98.7%success rate across all major detection platforms
What Our Users Say
Thousands of writers trust SupWriter every day
Ready to Write with Confidence?
Join thousands of students and researchers who trust our AI-powered rewriting tool to create authentic, undetectable content.
No credit card required • Free tier available • Cancel anytime