About this tool
Review English prose before publishing articles, landing pages, emails, or documentation. Predominantly non-Latin text keeps basic counts without an invented Flesch score.
Readability Score Checker helps writers, marketers, editors, and product teams see whether a draft is easy enough for the intended audience. It estimates reading ease, grade level, sentence length, complex word rate, and reading time so the next edit can focus on clarity instead of guesswork.
- Calculates Flesch Reading Ease and Flesch-Kincaid grade estimates from Unicode-aware sentence segmentation and a maintained English syllable estimator.
- Reports sample confidence, sentence and paragraph counts, complex-word rate, reading time, and the location of sentences with 25 or more words.
- Starts empty, accepts up to 250,000 characters, and processes text locally without adding the draft to the URL.
- Shows the exact formulas and language limitations so the score remains an editing signal rather than a ranking or quality guarantee.
How to use Readability Score
Paste the draft, set a target grade level and reading speed, then review the score, long sentences, and editing suggestions. Use the formula notes when technical terms, product names, acronyms, or code-like text make the score less representative of the real reader experience.
When this tool is useful
- Before publishing landing pages, documentation, help articles, blog posts, or SEO tool pages.
- When rewriting AI-assisted copy that sounds dense, generic, or hard to scan.
- Before handing a draft to an editor, client, or reviewer who needs a quick clarity snapshot.
Practical tips
- Review long sentences first because they are often the fastest readability win.
- Do not remove necessary technical terms only to improve a score.
- Pair readability with word count, keyword density, and manual editorial review before publishing.
Examples you can test
Load an example, compare the result with the expected output, then replace it with your own input.
Check a landing-page intro
Example input
Paste a product intro with long sentences and a target grade level of 8.
Expected output
Reading ease score, estimated grade level, long sentence warnings, and editing suggestions.
Landing pages usually benefit from a direct opening and shorter sentences before feature details.
Review documentation before publishing
Example input
Paste a help article with acronyms, product names, and setup steps.
Expected output
Grade-level estimate plus a warning to review technical terms in context.
Documentation should stay accurate, so readability improvements should not remove necessary terminology.
Validation checklist
- Check the exact final draft, not placeholder text.
- Use the score as an editing signal rather than proof that the page is helpful.
- Review long sentences, dense paragraphs, and undefined technical terms manually.
- Pair the result with SEO intent, examples, evidence, and user-task completion before publishing.