Smartweb.tools Check your text readability with Flesch-Kincaid grade level, reading ease score and Gunning Fog index.

Still loading the full interface. Please wait a moment.

Readability Score Checker

Check your text readability with Flesch-Kincaid grade level, reading ease score and Gunning Fog index.

Check how easy your writing is to read

The Readability Score Checker analyses your text and reports well-known readability metrics, including the Flesch Reading Ease score, the Flesch-Kincaid grade level and the Gunning Fog index. These scores estimate how much education a reader needs to understand your writing on the first pass, based on sentence length and word complexity.

Why readability matters

Clear writing keeps readers on the page, improves comprehension and can support your SEO by reducing bounce rate. Most web audiences prefer content written at roughly a grade 7-9 level: short sentences, everyday words and a natural flow. Overly complex writing loses casual readers, while writing that is too simple can feel thin for technical topics. This tool helps you find the right balance for your audience.

What the scores mean

  • Flesch Reading Ease - higher is easier; 60-70 is comfortable for a general audience.
  • Flesch-Kincaid grade level - the US school grade needed to read the text.
  • Gunning Fog index - another estimate of years of education required.

How to improve your score

Break long sentences into shorter ones, replace long words with simpler alternatives, use active voice, and add headings and lists to make the page scannable. Paste a draft, review the scores, edit, and re-check until the text reads smoothly. Use it alongside the Word Counter and SERP Simulator to publish content that is both the right length and easy to read.

How to use Readability Score Checker

  1. Open the Readability Score Checker page.
  2. Add your text, file or values in the input area.
  3. Click the action button and review the result.
  4. Copy or download the result where supported.

Why this tool is useful

  • Free to use for everyday tasks.
  • Works directly in the browser with no install required.
  • Clean interface without confusing options or forced downloads.
  • Useful for creators, students, marketers, developers and businesses.

Example use cases

Example uses: checking SEO snippets before publishing, generating schema markup for blog posts, previewing social share cards, extracting text from a received PDF, and converting photos to PDF for sending.

Frequently asked questions

Is this tool free to use?

Yes. This tool is completely free to use on Smartweb.tools, with no sign-up, subscription or hidden charges.

Does it work on mobile?

Yes. The tool is responsive and works in modern browsers on phones, tablets and desktops.

Related tools

  • URL Slug Generator — Generate clean SEO-friendly slugs for blog posts, tools and landing pages.
  • JSON Formatter — Format and validate JSON data for developers and technical SEO work.
  • Google SERP Simulator — Preview how your page title, description and URL appear in Google search results before publishing.
  • Open Graph Preview — Preview your Open Graph meta tags as Facebook, Twitter and LinkedIn social media share cards.
  • Schema Markup Generator — Generate JSON-LD schema markup for articles, FAQs, products, local businesses, breadcrumbs and how-to guides.
  • Meta Length Checker — Check if your page title and meta description are the optimal length in characters and pixels for Google search results.