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Readability Score Checker

Get Flesch reading ease, grade level, sentence length and long-sentence flags for any text.

100% free No signup Runs in your browser

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About this tool

What is the Readability Score Checker?

A readability score checker estimates how easy text is to read using formulas such as Flesch Reading Ease and the Flesch-Kincaid grade level, based on sentence and word length. Plain wording helps both readers and the AI systems that summarise your page.

It runs entirely in your browser. Nothing you paste or upload is sent to a server or stored.

Why use it

Why use this tool

Instant result

Results appear as you run it, with nothing to install and no waiting on a queue.

Plain-English output

Each finding says what it means and what to do next, not just a raw value.

Copy-ready

Copy the output straight into your CMS, spreadsheet, ticket or client report.

Private by design

Your content stays on your device. We do not receive or keep it.

How it works

A few clicks to a better result

1

Paste your text

A few paragraphs or a full article.

2

Read the scores

Check grade level and long sentences.

3

Edit for clarity

Shorten sentences and swap complex words.

Written, edited and verified by Hemant Kumar, SEO consultant in Jaipur with about 8 years of experience in technical SEO, AEO and GEO. Last reviewed: Oct 2026.
Guide

How to read the result and act on it

The score is a rough guide to how demanding your text is, based on sentence and word length. A higher Flesch Reading Ease number and a lower grade level mean easier reading. Use it as a prompt to review the longest sentences and the heaviest words rather than as a target to hit exactly. Split sentences that carry several ideas, swap jargon for plain terms, and use shorter paragraphs and descriptive subheadings. Match the level to your reader: a consumer guide should read easily, while an expert piece can sit higher if the vocabulary is necessary. Re-run the check after edits and compare drafts, but always read the text aloud as a final test.

Common mistakes to avoid

Avoid chasing a perfect number. Formulas count syllables and sentence length, so they cannot judge accuracy, structure or clarity of ideas. Simplifying to the point of losing necessary technical terms can make an expert article less useful. Another mistake is applying English formulas to text in other languages, which gives unreliable results. Do not paste headings, code or lists with the body and expect an accurate score; lists and fragments distort averages. Also avoid short, choppy sentences throughout just to raise the score, since rhythm matters. Use the score as one signal alongside feedback from real readers and the questions they ask.

Next steps

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FAQ

Questions, answered

The formulas are tuned for English. Scores for other languages are only rough.
It estimates the US school grade needed to understand a text, calculated from average sentence length and syllables per word. A grade of 8 means roughly an eighth-grade reader.
No. The tool runs in your browser, so what you enter is processed on your device and nothing is stored or sent anywhere. Copy any result you want to keep before closing the tab, since it will not be saved.
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