What is a Readability Checker?
A readability checker measures how easy your text is to read and assigns standardized scores that estimate the education level a reader needs to understand it — using formulas like the Flesch Reading Ease and Flesch-Kincaid Grade Level.
This checker runs seven formulas at once, detects passive voice and complex words, estimates your audience, and recommends precise fixes — all privately in your browser. Polish the result with the Grammar Corrector or simplify it with the Paraphraser.
Seven Formulas, One View
How readability scores work
Paste your text
Drop in an article, email or essay. It’s analyzed instantly and privately in your browser.
Read the scores
Seven formulas — Flesch, Flesch-Kincaid, Fog, SMOG, Coleman-Liau, ARI and Dale-Chall — compute live.
Spot the issues
Long sentences are highlighted, and clarity, engagement and audience indicators show what to fix.
Act & export
Follow the recommendations, then copy the report or export it as TXT, PDF or DOCX.
Readability formulas explained
Each formula weighs sentence length, word length and syllables differently. Here’s what each measures and when to lean on it.
| Formula | Scale | Best for |
|---|---|---|
| Flesch Reading Ease | 0–100 (higher = easier) | General web content and a quick overall ease score. |
| Flesch-Kincaid Grade | US school grade | The most widely used grade-level benchmark. |
| Gunning Fog Index | Years of education | Technical and business writing with complex words. |
| SMOG Index | Years of education | Health and safety content; needs longer samples. |
| Coleman-Liau Index | US school grade | Automated checks — uses characters, not syllables. |
| Automated Readability (ARI) | US school grade | Real-time tools; character-based and fast. |
| Dale-Chall Score | Difficulty score | Education content, using a list of familiar words. |
Key benefits
Seven formulas at once
Compare Flesch, Flesch-Kincaid, Gunning Fog, SMOG, Coleman-Liau, ARI and Dale-Chall side by side.
Audience suitability
See instantly whether your text fits students, general readers, professionals, executives or academics.
Live highlighting
Overly long sentences are flagged in your text so you know exactly what to shorten.
Actionable fixes
Prioritized recommendations — split sentences, cut passive voice, replace complex words — not just numbers.
Private by design
Every formula runs locally. Your text is never uploaded or stored — safe for confidential drafts.
Free, no sign-up
Unlimited analysis with no account, no email and no watermark, plus TXT, PDF and DOCX export.
SEO, content & business use cases
SEO & content marketing
Hit a Grade 7–9 reading level to widen your audience, cut bounce rate and earn more engagement.
Blogging
Keep posts skimmable and friendly with short sentences, plain words and tidy paragraphs.
Academic writing
Confirm your writing matches the expected level — and simplify where clarity is being lost.
Business communication
Make reports, proposals and policies clear so busy readers grasp them on the first pass.
UX & product copy
Keep interface text, help docs and onboarding at a low grade level for effortless comprehension.
Accessibility
Plain language is inclusive language — lower reading levels help every reader, including those with disabilities.
Improving engagement through readability
Target Grade 7–9 online
Most web audiences read most comfortably around an eighth-grade level. Aim there unless your audience is specialist.
One idea per sentence
Split sentences over 25 words. Shorter sentences are the single biggest lever on readability scores.
Choose plain words
Swap three-syllable words for shorter ones where meaning allows — “use” over “utilize”, “help” over “facilitate”.
Prefer active voice
Active sentences are shorter and clearer. High passive percentages drag clarity and engagement down.
Common readability mistakes
- Chasing a single score instead of reading the recommendations behind it.
- Writing for experts when your real audience is general readers — match the level to the reader.
- Packing several ideas into one long sentence, which spikes every grade-level formula.
- Confusing simple with simplistic — clear writing still respects nuance; it just removes friction.
Frequently asked questions
A readability checker analyzes how easy your text is to read and assigns standardized scores — like the Flesch Reading Ease and Flesch-Kincaid Grade Level — that estimate the education level a reader needs to understand it. This tool computes seven formulas at once, in real time and privately in your browser, and turns them into clear recommendations.
On the 0–100 Flesch Reading Ease scale, higher is easier. Scores of 60–70 are “standard” and suit most web content and a general adult audience. Aim for 60+ for blogs and marketing, 70+ for broad consumer content, and accept lower scores (30–50) only for academic or technical writing aimed at experts.
Reading Ease (Flesch) is a 0–100 score where higher means easier. Grade Level formulas (Flesch-Kincaid, Gunning Fog, SMOG, Coleman-Liau, ARI) instead report a US school grade — so “Grade 8” means an eighth-grader could read it. Most online content should target Grade 7–9 to reach the widest audience comfortably.
For general web writing, the Flesch Reading Ease and Flesch-Kincaid Grade are the most widely used. Gunning Fog and SMOG emphasize complex words and suit technical content; Coleman-Liau and ARI use character counts and are easy to automate; Dale-Chall uses a familiar-word list and is strong for education. This tool shows all of them so you can compare.
Readable content keeps visitors on the page longer, lowers bounce rate and earns more shares and links — signals that correlate with better rankings. Clear writing also helps search engines and AI answer engines understand and quote your content. Readability won’t rank a thin page, but among strong pages it improves engagement and reach.
Shorten long sentences so each carries one idea, replace three-syllable words with plainer alternatives, cut filler, prefer active voice, and break long paragraphs into shorter ones. This tool highlights overly long sentences and lists the exact fixes that will raise your scores fastest.
For a broad online audience, target around Grade 7–9 (Flesch Reading Ease 60–70). Marketing and consumer content can go simpler; B2B, legal and academic content naturally sits higher. The Audience Suitability indicator tells you whether your current text fits students, general readers, professionals, executives or academics.
Yes. It is 100% free with no sign-up, and every formula is computed locally in your browser — your text is never uploaded or stored. You can copy the analysis or export your text as TXT, PDF or DOCX.
The formulas are well-established and consistent, but they measure surface features — sentence and word length, syllables and familiar words — not meaning. They’re excellent for comparing drafts and spotting overly dense writing, but always pair the numbers with your own judgment about clarity and tone.
Written by Omnitool Editorial Team
Our content is crafted by content strategists and software engineers to guarantee formula accuracy, practical guidance, and complete user privacy. Co-reviewed by senior SEO strategists.