Free SEO & social tool
Readability Checker
Score how easy a page’s main text is to read, and find the sentences that make it hard.
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What it checks
Reading level
Flesch Reading Ease plus Flesch–Kincaid, Gunning Fog, SMOG and ARI grades.
Long sentences
Flags pages where more than 15% of sentences run past 25 words.
Passive voice
Estimates the share of passive sentences and warns above 10%.
Paragraph length
Finds walls of text over 150 words.
Subheadings
Checks for a heading at least every 300 to 400 words, so readers can scan.
Hardest sentences
Lists the toughest sentences with long words marked, so you know where to start.
Questions
What is a good Flesch Reading Ease score?
60 to 70 is plain English that most adults read easily. Higher is easier. Below 50 is hard going for a general audience, though fine for specialists.
What grade level should I aim for?
Around 8th or 9th grade for a general audience. Shorter sentences and shorter words bring it down fastest.
Which part of the page do you score?
The main text: the <article> or <main> element when there is one, otherwise the body without menus, headers, footers, sidebars, forms and code. Headings count toward structure, not the score.
Does it work for other languages?
The formulas are built for English syllables and sentence length. For other languages we still show the numbers, but flag them as a rough guide.