Free readability checker: paste any content and get an instant Flesch score, Gunning Fog index, passive voice %, sentence histogram, and specific suggestions to make your writing clearer.
Paste your content on the left and readability scores will appear here instantly: no button needed.
Seven metrics covering reading ease, grade level, sentence complexity, and passive voice — all from one text input.
Confirm posts hit a 60–70 Flesch score before publishing. Use the sentence difficulty view to identify and shorten the red-highlighted overlong sentences.
Verify long-form content stays within the appropriate Flesch range for the target audience. High bounce rates from confusing content are a negative engagement signal.
Calibrate academic writing to the right complexity level. Grade level output shows whether your essay reads at the expected difficulty for your course.
Spot passive voice clusters and overlong sentence patterns in client or student documents. Use the histogram to see exactly where sentence length skews high.
Paste your blog post, article, email, or any text into the input on the left. The readability checker requires at least 50 characters to compute meaningful scores.
Your Flesch Reading Ease score appears immediately. 60–70 is standard for general web content. Below 50 means most readers will struggle. Above 80 is very easy.
Scroll down to the Sentence Difficulty View. Orange-highlighted sentences are hard (21–30 words); red means very hard (30+ words). Shorten these first.
The Suggestions panel shows specific fixes: shorten sentences over a specific length, reduce complex words, reduce passive voice. Apply each fix and re-check.
Content that is hard to read gets abandoned. Studies consistently show that readers leave pages with a Flesch Reading Ease score below 40 at significantly higher rates. The Flesch score — developed by linguist Rudolf Flesch in 1948 and still the industry standard — measures readability on a 0–100 scale based on average sentence length and average syllables per word. A score of 60–70 targets a standard US 8th–9th grade reading level, which is appropriate for most general-audience websites. Run this readability checker on every draft to confirm your score before you publish.
This readability checker also computes Flesch-Kincaid Grade Level, Gunning Fog index, estimated reading time, average sentence length, and complex word percentage. Readability affects E-E-A-T signals indirectly: Google's quality rater guidelines assess whether content is appropriate for its intended audience. High bounce rates caused by confusing content are a negative engagement signal. Pair this readability checker with the clarity checker to catch passive voice and filler phrases, and the grammar checker for error-free copy.
SEO teams use this readability checker to confirm that long-form content stays within the 60–70 Flesch range before publishing. Content writers use it to shorten sentences that push grade level above their target audience. After checking readability, verify keyword balance with the keyword density tool and remove AI writing patterns with the passive voice remover.
Check readability, then verify clarity, grammar, and keyword density before publishing.
Free, instant, no signup. Paste your content and get Flesch score, grade level, passive voice %, and clear fixes.