Readability Score Checker Online (100% Free & Private)
Free readability score checker that runs in your browser. No sign-up, no install.
Flesch-Kincaid & Gunning Fog Readability Analyzer
What this tool does and who it is for
Paste a piece of writing and this tool computes the Flesch Reading Ease score from 0 to 100, the Flesch-Kincaid US grade level, the Gunning Fog index, average words per sentence and the total word count. A plain-language label tells you where the text sits.
All three measures rely on sentence length and syllables. The tool counts sentences by splitting on periods, question marks and exclamation marks, and estimates syllables with a rule-based guess, so results are approximate.
Use the numbers to compare drafts of your own writing. A shorter average sentence and simpler words will raise the score, but a high score does not mean the content is good.
Official Formula / Technical Standard
Real-World Worked Scenario
Enter your target URL and parameters to produce standard-compliant markup and tracking directives.
When people use it
Plain-language edits
Check a service page or help article and shorten the longest sentences until the grade level is closer to your readers' level.
Comparing versions
Paste the old and the new version of an intro and see whether the rewrite got easier to read.
Matching audience
A consumer finance blog may aim for a lower grade than a developer guide. The numbers help you notice drift.
Notes for US users
- The grade level is a US school-grade scale, which is the convention for many US plain-language guides and some government content standards.
- Google does not use Flesch scores in ranking. Readability helps readers finish and understand your page, which is the real goal.
- Technical, legal and medical terms add syllables. A lower score on specialist content is normal, so judge it against your audience.
Limits and what to double-check
- •Abbreviations, decimals and URLs contain periods that the sentence splitter reads as sentence ends, which can distort the averages. Lists and headings without punctuation merge into long sentences.
- •Syllable counts are an approximation, and non-English text is not supported.
- •The score is capped between 0 and 100, and the grade level has a minimum of 1.
Expert Best Practices & Common Pitfalls
Recommended Best Practices
- •Adhere strictly to official Google Search Central guidelines and character length bounds.
- •Test generated markup in Google's Rich Results Test before publishing.
- •Keep URLs, tags, and tracking parameters standardized and documented across your marketing team.
Common Mistakes to Avoid
- •Using inconsistent naming conventions or mixed uppercase letters in campaign tracking.
- •Stuffing unnatural keywords into page titles and meta descriptions.
- •Publishing broken or non-canonical URL structures that fragment search equity.
Features & Security Architecture
- 100% Client-Side: Zero server uploads ensure complete privacy and data confidentiality
- Fast Results: Processing happens on your own device, so there is no upload or server queue to wait for
- No Sign-Up Required: Completely free to use with no daily usage caps or account requirements
- Works on All Devices: Fully responsive across desktop, tablet, and mobile browsers
Frequently Asked Questions
How does the Readability Score Checker work?▼
The Readability Score Checker runs 100% inside your web browser using modern client-side JavaScript. It performs calculations, conversions, and document processing locally on your device without sending any data to external servers.
Is this readability score checker completely free to use?▼
Yes. This tool is completely free with no usage limits, no subscriptions, and no registration required.
Is my data private when using the Readability Score Checker?▼
Yes. Because all operations execute locally on your computer or phone, your inputs, documents, and data never leave your browser.
What is a good Flesch Reading Ease score?▼
For general US web content, scores around 60 to 70 are commonly treated as plain, conversational English, and higher is easier. There is no ideal number. Technical or legal topics will score lower, so aim for the clearest version your subject allows.
Does readability affect Google rankings?▼
Google has not said it uses readability formulas as a ranking signal. Clear writing still helps people stay and act, and Google's guidance favors helpful content written for people. Use the score as an editing guide, not a target. Test with real readers when you can, since clear writing is the part that actually helps.
What reading level should I write for?▼
For a general US audience, many plain-language guides suggest about 8th grade or lower. Match it to your readers: a medical journal can be higher, a consumer how-to should be lower. Test with real readers when you can. Plain wording is rarely a mistake, but never simplify so far that specialist readers lose precision.
Why does my score change when I add bullets?▼
The tool splits sentences on end punctuation, so bullets without periods run together into one long sentence and lower the score. Add periods to list items, or paste only the paragraph text, for a fairer reading. The same effect happens with headings and menu text, so compare like with like when you paste.