Readability & Writing Statistics – Free Text Analysis Tool
Analyze your writing like a pro. Get instant readability scores, passive voice detection, and actionable suggestions to improve your clarity. 100% private and client-side.
How Readability Scores Work
Readability formulas use mathematical models to estimate how difficult a text is to read. Most indices, such as the Flesch Reading Ease or the Automated Readability Index (ARI), calculate the relationship between sentence length and word complexity (syllable count or character length). For example, the Flesch-Kincaid Grade Level translates these metrics into a U.S. school grade, helping you tailor your content to a specific education level. Our tool integrates nine different algorithms to give you a multi-dimensional view of your prose, ensuring consistency across various evaluation methods.
Writing Insights Beyond Basic Metrics
Effective writing is about more than just short sentences. Our analysis engine detects structural issues like passive voice, which can make your writing feel weak or indirect. We also track adverb usage and weak qualifiers that often clutter professional communication. By monitoring lexical density and vocabulary richness, you can determine if your text is too repetitive or overly academic for your target demographic. These deep writing statistics provide the "why" behind your readability scores, offering a roadmap for meaningful revisions.
Improve Your Writing with Actionable Feedback
Traditional checkers give you a score and leave you to figure out the rest. This master tool provides specific, rule-based suggestions to enhance your clarity. If a sentence is too long, our heatmap will highlight it in red, signaling that it should be broken into smaller, more digestible parts. We identify complex phrases and suggest simpler alternatives, helping you maintain a high readability index without sacrificing your message's depth. Use our unique "Compare Mode" to see exactly how your revisions have improved your scores in real-time. check color contrast for accessibility
FAQ — Readability & Writing Statistics – Free Text Analysis Tool
Common questions about reading scores and writing quality.
How to Check Your Text's Readability
Paste Your Text
Paste any text — blog posts, essays, landing pages, reports — into the input area. There's no minimum or maximum length. parse and diagram sentence structure
Set Your Target
Configure your target grade level and reading speed, and enable the heatmap or passive voice highlights if needed.
Click "Analyze Writing"
Nine readability formulas run instantly. A live heatmap highlights complex sentences and writing insights flag issues to fix.
Act on the Results
Use the writing insights to simplify sentences, reduce passive voice and hit your target grade level. Export the report if needed.
Readability Analysis in Action
A typical blog post targeting a general audience should aim for a Flesch Reading Ease score around 60–70 and a Flesch-Kincaid Grade Level of 8 or below.
Example output for a well-written 500-word article:
Flesch Reading Ease: 68 (Standard) · Flesch-Kincaid Grade: 7.4 · Gunning Fog: 9.1 · Passive Voice: 8% · Avg. Sentence Length: 16 words. All within recommended ranges for a general audience.
Who Uses Readability Analysis?
Content Marketers & Bloggers
Ensure blog posts and landing pages are readable for the target audience and not penalised by Google for complex language.
Academic Researchers
Verify that papers and reports match the expected reading level and contain appropriately complex vocabulary.
Teachers & Educators
Assess whether educational materials match the reading level of their intended student audience.
UX & Technical Writers
Write documentation and UI copy at the right complexity for users with different technical backgrounds.
How Readability Formulas Work
Text Parsing
The text is split into sentences (by punctuation) and words (by whitespace), and each word's syllables are counted using a phonetic algorithm.
Formula Calculation
Each of the nine formulas applies a different model. Flesch uses syllables and sentence length; Fog uses complex words; Dale-Chall uses a 3,000-word familiarity list.
Linguistic Analysis
Beyond scores, the tool detects passive voice constructions, adverb overuse and weak qualifiers using pattern matching.
Visual Output
The difficulty heatmap colour-codes every sentence from green (easy) to red (very hard), showing visually where readers will struggle.
Who Benefits Most
Readability analysis is valuable for any writer who cares whether their audience actually understands and engages with their content — from technical documentation to marketing copy.
Copywriters & Marketers
Ensure every word earns its place. Readable copy converts better, ranks better and earns more backlinks.
Students & Academics
Calibrate essay complexity to match course requirements and avoid inadvertent over-complication.
Healthcare & Legal Professionals
Patient information, legal disclosures and public-facing documents must meet readability standards for compliance.
Tips for Improving Readability
Aim for Grade 8 for General Audiences
Major news outlets (BBC, Reuters) write at a 6th–8th grade level. This maximises reach without sacrificing authority.
Watch the Sentence Length
Sentences over 25 words are the single biggest contributor to a poor readability score. Break them up with full stops or connectors.
Reduce Passive Voice Below 10%
Most style guides recommend keeping passive voice under 10%. Active voice is shorter, clearer and more engaging.
Use Shorter Paragraphs Online
Online reading behaviour differs from print. Keep paragraphs to 2–4 sentences for better scannability and improved perceived readability.
Why Readability Matters
Writing that is hard to read loses readers — and loses rankings. Google's quality guidelines explicitly mention readability as a component of content quality. Complex language frustrates readers and increases bounce rate.
Reader Engagement
Studies show readers abandon pages when the reading level is more than 2 grades above their own. Matched complexity keeps them reading.
SEO & Dwell Time
Pages readers stay on longer rank better. Readable content reduces bounce rate and increases session duration — both strong ranking signals.
Accessibility
Plain language is an accessibility requirement for government and healthcare websites in many countries. WCAG 3.0 includes reading level guidance.
Your Text Stays Private
Every analysis runs 100% in your browser — no text is ever uploaded, stored or processed on our servers. Sensitive drafts, client content and confidential reports are always safe to analyse here.
No account required, no cookies that track your content, no data retention. Full GDPR compliance by design.
Related Writing & Analysis Tools
The Nine Readability Formulas Explained
Each formula was designed for a specific type of text and audience. Using multiple formulas together gives a more complete picture than any single score.
Flesch Reading Ease
The original readability formula (1948). Scores range from 0 to 100: 60–70 is plain English for adults; below 30 is very difficult academic writing.
Gunning Fog Index
Estimates years of formal education needed to understand the text. A score of 12 corresponds to a US high school senior; below 8 is accessible to most readers.
Dale-Chall Formula
Compares words against a list of 3,000 words familiar to most 4th-grade students. Focuses on vocabulary familiarity rather than sentence length.
Troubleshooting
My Flesch score seems unusually low.
Check for very long sentences. A single 60-word sentence can drag the average score significantly. The heatmap will highlight it in red — break it up.
Why are some metrics showing as "N/A"?
Some formulas require a minimum word count. Paste at least 100 words to get all nine readability scores calculated accurately.
The passive voice count seems too high.
The passive voice detector uses a heuristic pattern (auxiliary + past participle). It may flag some complex active constructions. Use it as a guide rather than an exact count.
Compare Mode isn't showing any difference.
Both text boxes need content and you need to click "Analyze Writing" with Compare Mode enabled. Ensure the second text is different from the first.
Did You Know?
The Flesch Reading Ease formula was developed by Rudolf Flesch in 1948 and is still the most widely used readability metric worldwide. It was originally commissioned by the Associated Press to help journalists write more clearly for a general audience.
The US Department of Defense adopted readability standards in the 1970s, requiring training manuals to be written at no higher than an 8th-grade reading level. Most government plain-language initiatives use the same standard today.
Improve Your Writing Today
The CharCount readability analyser gives you nine scores, a heatmap and writing insights in seconds — everything you need to take your text from complex to clear.
Whether you're writing for Google, a professor or a general audience, the numbers don't lie. Readable writing performs better, every time.
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