What is a readability checker?

A readability checker measures how easy your writing is to understand and expresses it as a score. This free tool analyzes your text with standard formulas like Flesch reading ease and Flesch-Kincaid grade level, then reports the reading level, key text statistics, and the specific sentences that are hardest to read. You can paste text directly or enter a URL to check a live page.

What is the Flesch reading ease score?

The Flesch reading ease score rates text on a 0 to 100 scale, where a higher number means the text is easier to read. Scores of 60 to 70 are considered plain English that most adults read comfortably. Scores below 30 are difficult and typically require a college-level reader. The score is calculated from average sentence length and average syllables per word.

Is a 30 readability score good?

A Flesch reading ease score of 30 is on the difficult end of the scale. Text at that level reads like a dense academic or technical document and is best understood by college graduates. For most blog posts, marketing pages, and general web content, aim for a score of 60 or higher so a wider audience can read it easily. If your score is around 30, shorten your sentences and swap long words for simpler ones.

What is a good readability score for SEO content?

For most SEO and web content, a Flesch reading ease score of 60 to 70 (roughly a grade 7 to 8 reading level) is a good target. Content in this range is easy for a broad audience to scan and understand, which supports longer time on page and lower bounce rates. Highly technical audiences can tolerate lower scores, but as a rule, clearer content performs better for both readers and search.

What is the Flesch-Kincaid grade level?

The Flesch-Kincaid grade level converts your text into a US school grade. A score of 8, for example, means the average US eighth grader could understand the text. It uses the same inputs as reading ease (sentence length and syllables per word) but expresses the result as a grade rather than a 0 to 100 score, which many people find more intuitive.

What is a Flesch-Kincaid grade level of 12?

A Flesch-Kincaid grade level of 12 means your text reads at a US twelfth-grade level, roughly the reading ability of a 17 to 18 year old finishing high school. It is readable for most adults but sits above the grade 7 to 8 range recommended for broad web content. If you are writing for a general audience, consider simplifying to bring the grade level down.

How can I improve the readability of my writing?

Shorten long sentences and break them into two, replace complex words with simpler alternatives, cut unnecessary adverbs, and prefer active voice over passive. Use short paragraphs, subheadings, and lists to make content scannable. This tool flags the exact sentences that hurt your score and offers AI rewrite suggestions, so you can fix the biggest problems first rather than guessing.

Does readability affect SEO rankings?

Google does not use a readability score as a direct ranking factor, but readability strongly influences the engagement signals that matter. Content that is easy to read holds attention, earns more time on page, and reduces bounce, which supports rankings indirectly. Clear content is also more likely to earn links and be quoted in AI answers, so improving readability is worth the effort even without a direct ranking boost.

Free SEO Tool

Free Readability Checker

Paste any text or a URL to get your Flesch reading ease, grade level scores, and the exact sentences that are hard to read. No sign-up required.

How to check readability in 3 steps

This readability checker is free to use with no account required. It runs the standard readability formulas right in your browser for pasted text, so your scores appear instantly and your content never leaves the page unless you choose to check a URL.

1. Paste text or a URL

Paste the content you want to check, or drop in a page URL and we pull the main article text for you.

2. Get your scores

Instantly see your Flesch reading ease, five grade-level scores, and full text statistics, all calculated with standard readability formulas.

3. Fix the hard parts

Review the sentences flagged as hard, passive, or adverb-heavy, then apply the AI rewrite suggestions to make them clearer.

What this readability checker measures

Rather than rely on a single number, this tool reports several established readability scores so you get a rounded picture of how your text reads:

Flesch reading ease. A 0 to 100 score where higher is easier. This is the headline number most people mean by a readability score.
Flesch-Kincaid grade level. The US school grade needed to read the text comfortably.
Gunning Fog and SMOG. Two more grade-level indices that weight complex, multi-syllable words heavily.
Coleman-Liau and Automated Readability Index. Character-based grade scores that do not depend on counting syllables, useful as a cross-check.

Alongside the scores you get full text statistics and a list of the hardest sentences, so you know exactly what to fix.

What readability score should you aim for?

For most web and SEO content, aim for a Flesch reading ease score of 60 to 70, which is roughly a grade 7 to 8 reading level. Content in that range is comfortable for a broad audience to scan and understand, which supports engagement signals like time on page.

Technical or academic audiences can handle lower scores, but clarity almost always helps. If your score is low, the fastest wins are shortening long sentences, replacing complex words with everyday alternatives, cutting filler adverbs, and switching passive voice to active. The flagged sentences and rewrite suggestions in the results point you straight to the sentences dragging your score down.

Does readability matter for SEO?

Google does not use a readability score as a direct ranking factor, but readability shapes the behaviour that does matter. Content that is easy to read keeps people on the page, earns more engagement, and is more likely to be linked to or quoted in AI-generated answers. Hard-to-read pages lose readers before they convert.

That is why readability is part of producing content that ranks, not a cosmetic afterthought. RankSpot bakes readability optimization into every article it generates, so the content it publishes lands in the readable range automatically. This free checker is the manual version: run your draft, fix what it flags, publish with confidence.