Last updated on November 2nd, 2026 at 06:23 pm
Readability Checker Tool
By Digital Mansoor · 12+ years in SEO
Paste your text. Get Flesch Reading Ease, grade level, reading time and the sentences that are too long.
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- Gives Flesch Reading Ease and a Flesch-Kincaid grade level for pasted text.
- Compares the grade with your target grade.
- Shows words, sentences, average sentence length, hard words and reading time.
- Highlights long sentences: amber over 20 words, red over 30.
What is the Readability Checker?
The Readability Checker measures how easy a text is to read from sentence length and word length. It adds a sentence length map so you can see which sentences to shorten.
It is built for bloggers and SEO writers who want content a wide audience can read.
How to use the free Readability Checker
- Paste your text: Paste a paragraph or a full article.
- Set a target grade: The example uses grade 8.
- Run the check: Click the button.
- Read the sentence map: Amber sentences are over 20 words, red over 30.
- Edit and re-run: Shorten long sentences and replace hard words.
Example: input and output
A short website blurb.
Results shown are from the live tool.
How the Readability Checker helps your SEO work
- See your reading level before you publish.
- Find the longest sentences first.
- Match text to your audience’s level.
- Keep copy short and clear.
- Track readability across edits.
Readability Checker compared with other free tools
I compared this with the readability checker on w3era.com, read from its page on 22 October 2026.
| Check | This tool | w3era.com |
|---|---|---|
| Scores | Flesch Reading Ease and Flesch-Kincaid grade | Five: Flesch Reading Ease, Flesch-Kincaid, SMOG, ARI and Dale-Chall |
| Input | Pasted text | Pasted text or a URL |
| Target grade comparison | Yes | Not mentioned |
| Sentence length map | Yes | Not mentioned on the page |
| Signup | None | None stated |
Where they are ahead: w3era.com gives five scoring formulas and can read a URL. This tool gives two formulas plus a target comparison and a sentence map.
Compared on 22 October 2026 by opening each tool and reading its page. Features can change.
What the Readability Checker cannot do
- This tool scores your text with word counts and simple rules in your browser. It does not use AI, and the scores describe patterns in the text, not quality.
- Syllables are estimated by rule, so scores can be off by a point or two.
- Formulas measure sentence and word length, not clarity or accuracy.
- Very short texts give unstable scores.
- Passive voice and jargon are not scored.
Is my text or data sent anywhere?
Your text is processed in your browser and is not sent to this site or any other server. The Save button keeps snapshots in your own browser storage. The share link puts your input in the part of the URL after the # sign, which browsers do not send to servers, but anyone you give the link to can read it.
Readability Checker FAQ
What is a good Flesch Reading Ease score?
Higher is easier. Scores around 60 to 70 suit most general web readers.
What reading grade should I aim for?
It depends on your audience. Many web writers aim for about grade 8.
Does readability affect SEO?
Google does not use a readability score. Clear writing helps readers stay and understand.
How is grade level calculated?
From average sentence length and syllables per word, using the Flesch-Kincaid formula.
Does it use AI?
No. It uses formulas in your browser.
Can I check a URL?
No. Paste the text.
Is the Readability Checker free?
Yes, it is free and needs no signup.
Want this done for your site?
Send your URL on WhatsApp and I will tell you what to fix first.
Need more than a free tool? See my on-page SEO consulting and content strategy consulting work.
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