Readability Checker - Flesch Score, Grade Level & 6 Formulas Free

Free Readability Checker — Flesch Score & Grade Level

Analyze text with six readability formulas, highlight long sentences, and spot weakeners. Runs entirely in your browser.

Six readability formulas

Flesch Reading Ease, Flesch-Kincaid, Gunning Fog, SMOG, Coleman-Liau, and ARI — all at once.

Sentence highlighting

Long and hard-to-read sentences are flagged so you know exactly where to edit.

Live analysis

Scores update as you type or paste — no submit button, no waiting.

Everything you need to know about readability checker.

Yes. No sign-up, no limits. The tool runs entirely in your browser.

Once the page loads, it does. All calculations happen locally—no server calls.

English only for now. The syllable rules and formulas are tuned for English.

No. Your text stays on your device. Nothing is uploaded or stored.

60-70 is the usual target. That's roughly 8th-grade level—clear enough for most readers without sounding dumbed down.

Words like 'very', 'really', 'perhaps' that dilute your point. Hemingway flagged them; cutting a few usually tightens the writing.

Flesch Reading Ease is the most widely used. Flesch-Kincaid gives you a grade. The others add nuance—no single number tells the whole story.