Readability Checker Tool

📊 Readability Checker

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Reading Time

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Avg Sentence Length

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Flesch Score

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Grade Level

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Passive Voice

Readability Checker | SEOScaleUp – Free Content Scoring Tool

✨ Smart SEO Helper

🔓 No Signup

Optimize Every Word with
Readability Checker
That Boosts Rankings

Instantly score your content's readability, uncover complex sentences, and get actionable fixes to engage readers and dominate search results.

Free forever

No credit card

Live scoring

SEO insights

Readability Checker dashboard showing grade level, sentence length, and improvement tips

📖

Readability Score

⚡

8th

Grade Level

2.5B+
Pages Analyzed

190+
Countries Covered

0.8s
Avg Result Time

100%
Free Core Features

14+
Metrics Per Text

🔍 what is it?

The Ultimate Readability Checker for SEO-Driven Content

Most writers guess whether their text is easy to read. But search engines reward clarity. Our Readability Checker analyzes sentence length, passive voice, complex words, and Flesch-Kincaid grade level – all in real time.

Stop losing readers to convoluted paragraphs. Get precise recommendations to transform dense copy into scannable, engaging content that ranks higher and converts better.

Flesch Score Sentence Length Passive Voice Transition Words

📊

Grade 8–12 ideal

Matches average reader comprehension

🎯

Actionable tips

Highlighted hard sentences to rewrite

Readability Checker interface showing highlighted text suggestions and readability score gauge

⚡ powerful features

Everything you need to polish every paragraph

Go beyond basic stats with deep readability intelligence.

Flesch-Kincaid Grade

Instantly calculates U.S. school grade level required to understand your text.

✓ Match content to audience level

Sentence Length Radar

Flags sentences exceeding 20-25 words that reduce readability.

✓ Improve scannability & dwell time

Passive Voice Detector

Identifies passive constructions that weaken engagement.

✓ Write direct, persuasive copy

Readability Heatmap

Visual color-coded highlights of problematic zones.

✓ Edit faster, target weak spots

Word Complexity Meter

Counts syllables and complex words per 100 words.

✓ Simplify without dumbing down

SEO Readability Score

Combined metric that predicts ranking potential.

✓ Boost both UX & Google ranking

Reading Time Estimator

Average reading time & engagement prediction.

✓ Improve session duration metrics

Grammar & Transition Check

Flags missing transition words and structure issues.

✓ Smooth flow = lower bounce rate

Multilingual Analysis

Supports 15+ languages for global content.

✓ International SEO readiness

📋 how it works

Three clicks to clearer, high-ranking content

No learning curve, instant readability analysis.

Paste or Upload

Add your article, blog post, or any text.

Instant Scan

AI analyzes 14+ readability metrics.

Fix & Optimize

Get line-by-line rewrite suggestions.

Export & Rank

Download report or republish improved copy.

💎 benefits

Why smart marketers choose readability insights

✓

Higher Dwell Time

Clear content keeps visitors reading 53% longer on average.

✓

Better Google Rankings

Readability is a confirmed ranking factor for featured snippets.

✓

Reduced Bounce Rate

Easy-to-read articles convert 2x more visitors.

👥 use cases

Tailored readability for every content creator

✍️

Bloggers & Writers

Optimize post grade level for your audience
Reduce complex sentences instantly
Improve newsletter open rates
Match competitor readability scores
Increase social shares

📈

SEO Professionals

Audit content for ranking potential
Integrate into content workflows
Prove content quality to clients
Find readability gaps
Scale content production

🏪

eCommerce Owners

Write product descriptions that sell
Reduce returns with clear instructions
Improve category page UX
Boost conversions by 34%
Analyze customer reviews clarity

📢

Marketing Agencies

Deliver readability reports to clients
White-label PDF exports
Track content team quality
Outrank competitors' thin content
Streamline editorial guidelines

🏆 why SEOScaleUp

Built for precision and scale

Deep readability algorithms

Uses Flesch, SMOG, and Coleman-Liau indexes.

Live collaboration ready

Share reports with editors or clients instantly.

Free forever tier

Unlimited checks, no hidden costs.

Google SEO Guide ↗Moz Readability Research ↗

⚖️ comparison

SEOScaleUp vs traditional methods

Feature	SEOScaleUp ✓	Manual/Free Alt	Expensive Paid Tool
Flesch-Kincaid Score	✓	✗	✓
Sentence Length Alerts	✓	~ (copy-paste)	✓
Passive Voice Detection	✓	✗	✓
Word Complexity	✓	✗	✓
Multilingual Support	✓	✗	~
API Access	✓ (Free tier)	✗	✓ ($99+)
SEO Readiness Score	✓	✗	✓
Team Collaboration	✓	✗	✓
Pricing	Free	Time-consuming	$99/month

❓ faq

Got questions? We’ve got answers

What readability score is best for SEO?+

Aim for grade level 8–10 (Flesch score 60–70). This matches average US adult reading level, maximizing reach and comprehension for most niches.

Does readability affect Google rankings?+

Yes, Google's algorithm uses readability as a user experience signal. Clear, well-structured content tends to earn more backlinks, lower bounce rates, and longer dwell time — all ranking factors.

Can I analyze multiple languages?+

Absolutely. Supports Spanish, French, German, Italian, Dutch, and more using language-specific readability formulas.

Is there an API for developers?+

Yes, SEOScaleUp offers a free API up to 1,000 requests/month for integrating readability into your CMS or custom tools.

How accurate is your analysis?+

We use industry-standard readability formulas (Flesch, Gunning Fog, SMOG) and sentence parsing with 98% correlation with manual evaluation.

Do I need to create an account?+

No signup required for instant checks. Create a free account to save reports and access advanced metrics.

What's the difference between readability and SEO?+

Readability focuses on clarity; SEO includes keywords and backlinks. Both are crucial — great content needs readability to engage users after they click.

Can I export readability reports?+

Yes, PDF, CSV, and detailed HTML reports are available with actionable rewrite suggestions.

🚀 ready to optimize