How to Check the Readability Score of Your Content Online for Free

You finish a blog post and it seems clear to you. You wrote it, you understand it, so it must be fine. But you've also been living with the topic for days, and you've lost track of what a fresh reader actually knows coming in. Sentences that felt natural to write might be harder to follow than you think.

Readability scores give you an outside view. Not a perfect one, but a useful one. A readability checker measures the structural properties of text, average sentence length, syllable counts per word, sentence complexity, and runs them through formulas that correlate with reading difficulty. CoditTools has a free readability checker that gives you these scores without any account or software needed.

What readability scores actually measure

The most widely used formula is Flesch Reading Ease. It scores text on a scale from 0 to 100. Higher scores mean easier reading. A score of 60 to 70 is considered standard for general web content, easily readable by most adults. Scores below 30 are typically academic or legal writing. Scores above 80 are simple, like children's books or clear instructional text.

The Flesch-Kincaid Grade Level formula converts the same underlying data to an approximate US school grade level. A grade level of 8 means an average eighth-grader could read it comfortably. Most successful blog content sits in the grade 6 to 10 range. Technical documentation and specialized content often runs higher, which is appropriate for its audience.

The Gunning Fog Index is similar but weights complex words (three or more syllables) more heavily. It's particularly useful for spotting paragraphs that use unnecessarily long words where simpler alternatives would work just as well.

None of these formulas measure whether the writing is clear in the actual meaning sense. You can write short sentences that are still confusing, and you can write longer sentences that are perfectly clear. The scores are signals, not verdicts.

How to use the CoditTools readability checker

1. Open the readability checker tool.
2. Paste the text you want to check. This can be a blog post, an email, a product description, or any other content.
3. The tool calculates and displays the readability scores automatically.
4. Review the scores in context of your intended audience. A technical API guide for developers can have a higher grade level than a consumer product description.
5. Identify specific long sentences or dense paragraphs that are pulling the score down. Rewrite those sections and check again.

What a good score looks like by content type

Blog posts and web content: aim for a Flesch Reading Ease of 60 to 75 and a grade level below 10. This covers most general audiences and matches what people are comfortable reading on screens.

Marketing copy and landing pages: aim higher, ideally above 70 Flesch. Short sentences, common words, and direct structure work best here. People scan landing pages rather than read them.

Technical documentation and developer content: grade level of 10 to 14 is acceptable when you're writing for an audience that understands the domain. Don't simplify technical accuracy just to lower a score.

Academic and legal writing: grade level of 14+ is standard and often necessary. Readability scores aren't the right benchmark for content that needs precision over accessibility.

Common mistakes when using readability scores

Optimizing the score instead of the writing. Cutting every long word or breaking every complex sentence in half will lower your grade level but may make the text less precise. Use the score to find the worst offenders, not to mechanically trim everything down.

Ignoring the audience context. A readability checker doesn't know who you're writing for. A score of 55 might be perfect for technical content aimed at specialists. A score of 70 might still be too dense for a consumer app where users are skimming quickly.

Only checking readability at the end. Checking mid-draft is useful too. If a specific section has a grade level of 16, that's a signal to reconsider the sentence structure in that section before finalizing it, not after.

What to do next

After improving readability, run the grammar checker in the text tools category as a final pass before publishing. The combination of readability check plus grammar check catches the structural and mechanical problems that a self-proofread often misses.

If you're also optimizing content for SEO, the SEO tools on CoditTools include a content brief generator that helps you structure posts around searcher intent, which works alongside readability improvements.

Write for your reader, use the score as a signal to find the hardest sections, and fix those specifically. That's the right use of the tool.