Readability Checker

Readability Checker is a free, browser-based tool built for one job: analyze readability across six formulas with grade level & suggestions. It is part of ToolsMonk's seo tools collection, so you can finish the work without downloading software, creating an account, or jumping between multiple websites.

This tool is especially useful for workflows such as checking that web or marketing copy is easy for your audience to read, getting a consensus grade level instead of trusting a single formula, and finding and rewriting the long, dense sentences that hurt comprehension. Because it runs directly in your browser, you can use it on desktop, tablet, or mobile while keeping the process fast and easy for one-off tasks as well as repeat work.

If you have been searching for readability, flesch kincaid, and reading level, this page covers those jobs with a clean interface, instant output, and no paywall in the way.

Readability Checker scores how easy your text is to read across six standard formulas, Flesch Reading Ease, Flesch–Kincaid, Gunning Fog, SMOG, Coleman–Liau and ARI, and reports a consensus grade, because each formula weights sentence length and word complexity differently. It also highlights the long or complex sentences dragging your clarity down and counts passive-voice constructions.

The Flesch score runs 0–100, higher being easier, and is driven by two things: average sentence length and average syllables per word. That's empowering, because it tells you exactly what to change, shorten sentences and choose simpler words and the score rises. For general web content, aiming around an 8th–9th grade level (roughly 60+) hits the sweet spot most adults read comfortably.

Clear writing isn't dumbing down. Even expert audiences absorb plain, well-structured text faster, so improving readability lifts engagement and comprehension across the board. And while Google doesn't score readability directly, clearer content keeps readers on the page and serves snippets and voice search well, an indirect SEO benefit.

Analysis runs in your browser, so your draft stays private. Pair it with Word Counter and the SEO Content Analyzer to balance length, keyword usage, and clarity before publishing.