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Readability Checker

Get instant Flesch-Kincaid scores, grade level, passive voice detection, and tips to improve clarity

This readability checker scores any text or URL for reading level in seconds: Flesch-Kincaid, grade level, passive voice and sentence-by-sentence highlighting. Readable content ranks better, gets cited more by AI models and holds readers longer, and text scoring Flesch 60 to 70 draws up to three times the engagement of dense writing. Paste text or enter a URL to see exactly which sentences to fix.

Instant Flesch-Kincaid score with grade level and best-fit content type
Color-coded sentences showing long, complex, and passive voice issues
Scores for each paragraph with clear tips on what to fix

How it works

Get started in 3 simple steps

1

Paste your text or enter a URL to check

2

See scores and color-coded sentence highlights right away

3

Use the tips to make your writing clearer and more engaging

Best use cases

Built for teams that take AI visibility seriously

1

Content teams checking articles before they go live

2

SEO teams making content easier for search and AI to cite

3

Writers making sure docs are easy for their readers to follow

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FAQ

Frequently asked questions

What is a good Flesch-Kincaid readability score?

A score of 60 to 70 works best for most web content. This matches a 7th to 8th grade reading level. Blog posts and marketing pages should aim for this range. Technical docs can target 40 to 50. Scores above 70 suit casual readers. Below 30 means the text is hard for most people to follow.

How does readability affect SEO and AI citations?

Search engines and AI models prefer clear content that answers questions directly. Pages scoring Flesch 60 or higher are more likely to appear in AI answers from ChatGPT, Perplexity, and Google AI Overviews. Readable content also lowers bounce rates and keeps readers on the page longer. Both are positive ranking signals.

What is passive voice and why should I avoid it?

Passive voice flips who does the action. For example, 'The report was written by the team' is passive. 'The team wrote the report' is active. Active voice is shorter, clearer, and easier to read. Aim for fewer than 10% passive sentences in your writing.

Does this readability checker work for non-English content?

This tool works best with English text. The Flesch-Kincaid formula counts syllables and sentence length, both tuned for English. It may give rough results for other languages using Latin script. For non-English content, treat the scores as a general guide rather than exact numbers.

How can I quickly improve my readability score?

Four changes make the biggest difference. First, keep sentences under 20 words. Second, swap complex words for simple ones ('use' instead of 'utilize'). Third, write in active voice. Fourth, break long paragraphs into 2 to 3 sentences. These fixes alone can raise your Flesch score by 15 to 20 points.

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