Como usar: Readability Score Checker
- Paste your text into the box — or click Sample to see how it works.
- Read the Flesch Reading Ease score and the grade levels: for most web content aim for 60+ and grade 8 or lower.
- Look at the highlights: long sentences are shaded and complex words underlined. Split long sentences and swap long words for short ones.
- Edit right in the box — the scores update as you type.
The six readability formulas
| Formula | Based on | Result |
|---|---|---|
| Flesch Reading Ease | Words per sentence, syllables per word | 0–100, higher is easier |
| Flesch–Kincaid Grade | Same inputs, scaled to US school grades | Grade level |
| Gunning Fog | Sentence length and words of 3+ syllables | Years of schooling |
| SMOG | Words of 3+ syllables per 30 sentences | Grade level (best for 30+ sentences) |
| Coleman–Liau | Letters per word and sentences per 100 words | Grade level |
| Automated Readability Index | Characters per word and words per sentence | Grade level |
Syllables are counted with English pronunciation rules (silent final “e”, “-es” and “-ed” endings, vowel groups), so the results match other readability tools closely but not always exactly. The scores are designed for English text.
Why readability matters for SEO
Search engines don’t use a readability score directly, but readers do: easy text keeps people on the page, answers their question faster and gets shared more. Most successful web pages land between grade 6 and 9. Check the length and keywords too with the Word Counter and Keyword Density Checker.
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Ferramentas que combinam com: Readability Score Checker
- Contador de caracteres — Conte cada caractere enquanto digita — com e sem espaços, letras, números, sinais de pontuação, emojis e bytes — e veja na hora se o seu texto cabe nos limites do X, SMS, Google e das redes sociais.
- Conversor de maiúsculas e minúsculas — Cole qualquer texto e converta-o entre 11 estilos de letras — desde “Title Case” para títulos até “camelCase” e “snake_case” para código.
- SERP Preview — Write a title tag and meta description and see exactly where Google is likely to cut them off — measured in pixels, not just characters, on desktop and mobile.
- Verificador de SEO e Auditoria de Site — Cole uma URL para fazer até 70 verificações de SEO na página, além de uma auditoria completa do site: velocidade do Lighthouse, cabeçalhos de segurança e SSL, dados estruturados, links quebrados, robots.txt e rastreadores de IA, noções básicas de acessibilidade, rastreamento e consentimento, SPF/DKIM/DMARC e validade do domínio — tudo reunido em uma única pontuação do site com correções priorizadas.