Score how easy your text is to read — Flesch Reading Ease and grade level.
Measure how readable your writing is with the Flesch Reading Ease score and a grade level averaged from five formulas (Flesch–Kincaid, Gunning Fog, SMOG, Coleman–Liau, ARI). See word, sentence, and syllable counts and reading time. Updates as you type.
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Sixty to seventy is the usual target for general web writing — roughly an eighth to ninth grade reading level, which most adults process comfortably. Journalism often sits higher, academic and legal writing much lower. Below about 30 the text is genuinely hard work, even for specialists reading in their own field.
From average sentence length and average syllables per word. That means the two levers are short sentences and shorter words. It is a proxy, not a measure of comprehension — the formula counts syllables, not whether your argument makes sense or your vocabulary suits the reader.
No. Optimising purely for readability produces choppy, patronising prose, and technical writing legitimately needs precise long words. Use it to catch problems — a sudden dip usually means a sentence has run away from you — rather than as a target to maximise. Audience matters more than the number.
Yes, Readability Checker is completely free. No signup, no account, and no watermark on outputs. A Pro tier is available for 100 AI ops/day and larger file sizes.
Readability Checker runs entirely in your browser. Your file is never uploaded — it is read, processed and saved locally, so it never reaches our servers or anyone else's. You can disconnect from the internet after the page loads and it still works.
Flesch Reading Ease: A 0–100 score where higher is easier. 60–70 is standard for most web content; news writes around 60, academic papers often below 30.
Grade level: The average of five formulas (Flesch–Kincaid, Gunning Fog, SMOG, Coleman–Liau, and Automated Readability) that each estimate the U.S. school grade needed. For a broad audience, aim for grade 6–8.
How to improve: Prefer short sentences, common words, and fewer syllables. The biggest levers are sentence length and the share of long, complex words.
Privacy: All analysis runs locally in your browser with plain JavaScript. Your text is never sent to a server, so it works offline.