Readability Checker: Free Online Score Test

A readability checker shows how easy your writing is to read. Paste text or upload a document (.txt, .doc, .docx, .pdf or .rtf), click Check Readability, and you get an overview, grade levels, text statistics, averages and keyword density. Use them to fix hard passages before you publish.

What Is Readability and How Is It Measured?

Readability is how easily a reader can understand a piece of writing on the first pass. Classic formulas estimate it from surface features of the text, mainly sentence length and word length.

The best-known example is the Flesch-Kincaid Grade Level: 0.39 x (words / sentences) + 11.8 x (syllables / words) - 15.59. The result maps to a U.S. school grade, so a score of 8 means an average eighth grader should follow the text. Its sibling, Flesch Reading Ease, runs from 0 to 100, and higher means easier. Scores of 60 to 70 are generally described as plain English.

Readability is not the same as quality. A formula cannot tell whether your facts are right or your advice is useful. It tells you whether the writing is easy to process, which matters because most web readers skim and leave quickly when a paragraph feels like work.

How to Use the Readability Checker

You can check a text in under a minute. Follow these steps:

1. Paste your draft into the large box that reads "Paste your text here to check readability score...". Or click Upload Document and choose a .txt, .doc, .docx, .pdf or .rtf file. The file name appears under the button.
2. Watch the live Words and Characters counters above the box to confirm the whole text arrived.
3. Click Check Readability.
4. Read the Readability Overview first, then scroll through Text Statistics, Grade Levels & Readability Index, Content Statistics and Averages.
5. In the Keyword Density section, switch between 1 Word, 2 Words and 3 Words to see which single words and short phrases you repeat most.
6. Edit your draft, paste it again and compare. Click Clear to start over with a new text.

Worked Example: Reading a Score Step by Step

Suppose you paste a 100-word paragraph with 5 sentences and about 140 syllables. That is 20 words per sentence and 1.4 syllables per word.

Using the Flesch-Kincaid Grade Level formula: 0.39 x 20 = 7.8, and 11.8 x 1.4 = 16.52. Add them to get 24.32, then subtract 15.59. The grade level is about 8.7, meaning the paragraph suits readers at a ninth-grade level.

Now split the longest sentences so the average drops to 14 words, and swap a few long words for short ones so syllables fall to 1.3 per word. The math becomes 0.39 x 14 = 5.46, and 11.8 x 1.3 = 15.34. The total is 20.8, minus 15.59, leaves about 5.2. Same ideas, three to four grades easier. Your results panel may use different formulas than this illustration, so compare your own before and after scores rather than matching them to these numbers.

How Do You Read the Results?

Each panel answers a different question about your draft. Start broad, then work down to specific fixes.

Readability Overview

The overview gives the headline verdict. Use it to decide quickly whether the text needs light polishing or a real rewrite.

Text Statistics, Content Statistics and Averages

These panels break the text into counts and averages, such as words, sentences and the average length of each. Long averages are the usual cause of a high grade level. If your average sentence runs past 20 words, that is the first thing to change.

Grade Levels & Readability Index

This panel shows grade-level scores and a readability index. Lower grade numbers mean easier text. Different formulas weigh sentence and word length differently, so two scores can disagree by a grade or two. Look at the trend and the overall range, not one number.

Keyword Density

This section lists your most-used words and phrases. Common filler words such as "the", "and", "that" and "with" are left out, so the list focuses on meaningful terms. Check whether your main topic appears naturally and whether an unrelated word is being repeated too often.

Common Target Levels

These are widely used writing guidelines, not rules from Google:

Fixes for Common Problems

• Grade level too high: split sentences at "and", "which" or "but", and keep one idea per sentence.
• Long words everywhere: replace "utilize" with "use" and "commence" with "start".
• Dense paragraphs: cap paragraphs at three or four sentences and add subheadings.
• One phrase dominates keyword density: vary your wording with synonyms and related terms.

Who Should Use a Readability Checker?

Anyone who writes for readers they cannot ask in person gets value from it. Here are concrete situations:

• Bloggers and SEO writers can test a post before publishing, then tighten it until it matches a general audience.
• Students can see whether an essay reads clearly or hides ideas in long sentences.
• Teachers and tutors can check handouts against the grade of their class.
• Marketers can test landing pages, newsletters and product descriptions. For subject lines and titles, the Headline Analyzer is a good companion.
• Clinics, nonprofits and public offices can verify that instructions and notices are understandable to the widest possible audience.

Best Practices, Mistakes and Troubleshooting

A few habits make the scores far more trustworthy.

Check Text Without Clutter

Remove navigation text, code snippets, long URLs and reference lists before you paste. They inflate word and sentence length and push the grade up for no good reason.

Finish Your Sentences

Bullet points and headings with no end punctuation can run together and look like one huge sentence. If your average sentence length looks absurd, add periods to list items or test the body copy only.

Use Enough Text

Very short samples swing wildly. Aim for at least 100 words, and ideally a full section, before trusting the grade level.

Check Your Upload

If an uploaded file shows few or zero words, compare it against the Words counter. A PDF that is a scan of a page may contain an image rather than selectable text. Copy the text out of the original document and paste it instead.

Do Not Chase a Perfect Score

Writing for a lower grade is not the same as writing worse. Short, flat sentences repeated for a whole page feel choppy. Mix lengths, and keep technical terms your audience needs, defining them once.

Pair It With Other Checks

After you simplify, run the text through the Grammar Checker to catch mistakes introduced during editing. If you want suggestions for making sentences clearer, try the Readability Improver. To see phrase repetition with stop words removed, the Article Density Checker gives a second view.

Checking in Word or Google Docs

Microsoft Word can show readability statistics after a spelling and grammar check, once "Show readability statistics" is turned on in the proofing options. Google Docs has no built-in readability score, so copy your document and paste it into the box above.

Limitations and Accuracy Notes

Formula-based scores are estimates. Syllable counts are approximated by rules, so unusual names, abbreviations and brand terms can be miscounted. Numbers, quotes and dialogue can also skew sentence length.

A readability score does not measure grammar, accuracy, tone, structure or whether you answered the searcher's question. Google's Search Central documentation encourages helpful, people-first content, but it does not name a readability score as a ranking factor. Treat the score as an editing aid for your readers, not a target to game.

If you only need raw counts of lines, words or sentences, the Line Counter is quicker. For more writing helpers in one place, browse the Content Writing Tools hub.

Plain, well-paced writing keeps more readers on your page. Paste your draft into the checker on this page, click Check Readability, fix the longest sentences first, and run it again to see how far your score improves.