Free Online Readability Checker — Check How Easy Your Text Is to Read
You wrote an essay, a blog post or a school assignment — but will people actually understand it? Our free readability checker tells you in seconds. Paste your text — or drop in a whole PDF, Word or Excel file — and get your readability score, your grade level, and simple tips to make your writing clearer. No signup, no fees, and your text never leaves your browser.
A readability checker (sometimes called a reading level checker) does one simple job: it measures how hard your text is to read. Teachers, students and bloggers all need it for the same reason — a text written at the wrong level either bores readers or loses them. A university paragraph handed to a 10-year-old fails; a children’s story handed to a professor looks lazy. That is why our tool goes further than a single score: it runs 10 readability formulas at once, shows your hardest sentences one by one, and even lets you set a target grade — “my essay must read at Grade 8” — and tells you if you hit it. The dedicated site we studied (readabilitypro.com) offers 8 formulas and none of this; the strongest rival we found (Kwebby) matches us with 10 formulas and adds an AI report — but ours pairs the same 10 formulas with file upload, hard-sentence flags and a target grade.
How to Use the Readability Checker
- Type or paste your text into the box. Scores appear live as you type — no button needed. Try the “Easy text”, “School paragraph” or “Hard academic text” samples if you want to see it work first.
- Or upload a file: click Upload and choose a TXT, PDF, Word (.docx) or Excel (.xlsx) file. A whole assignment is checked in one click — even a long essay.
- Read your score at the top: a big Flesch Reading Ease number (0–100), a plain label like “Very Easy” or “Very Difficult”, and the school grade your text reads at.
- Fix what it flags: the tool lists your hardest sentences (longest first) with a tip to split each one, and gives plain tips — shorter sentences, simpler words. When you are done, download your readability report to keep or hand in.
Scores are most reliable with at least 100 words of text — with a single sentence the numbers are only a rough hint. Your draft auto-saves in your browser, so an accidental refresh never loses your work. And because everything runs on your device, it is safe to check private documents — nothing is uploaded to any server.
What the 10 Readability Formulas Measure
One score can lie. Ten scores together tell the truth. Here is what each one does, in plain words:
- Flesch Reading Ease — the classic 0–100 score. Higher means easier. 90–100 is very easy; below 30 is very difficult.
- Flesch-Kincaid Grade Level — the U.S. school grade a reader needs to understand your text.
- Gunning Fog Index — the years of schooling needed; it punishes long sentences and big words.
- SMOG Index — built for checking health and public information; counts words with 3 or more syllables.
- Coleman-Liau Index — works from letters per word instead of syllables, so it stays steady on short texts.
- Automated Readability Index (ARI) — another grade level, based on characters, words and sentences.
- Dale-Chall Readability — checks your words against a list of words a 4th grader knows; unknown words count as difficult.
- LIX (Läsbarhetsindex) — a European formula that counts long words per sentence.
- Linsear Write — built for U.S. military manuals; grades your first 100 words.
- Spache Readability — made for children’s books; checks against a list of familiar words.
Our tool shows all ten side by side, then averages the grade-level ones into one clear answer: “Your text reads at about Grade 5 level.” If the formulas disagree, the average keeps you honest — no cherry-picking the friendliest number.
The Readability Checker That Reads Whole Files
Here is our honest edge. We studied the rival tools line by line before building ours, and here is what we found: the dedicated readability site (8 formulas) takes typed text only — no file upload, no hard-sentence list, no downloadable report. The strongest rival (10 formulas) adds an AI report, but still no file upload and no target grade.
So we built exactly that. Drop a PDF of your assignment or a Word document of your report — the tool reads it in your browser and scores it in full. Then set your target grade — Grade 8 for a school essay, College for a research paper — and the tool tells you plainly: matches, easier, or too difficult. Your hardest sentences appear in a list, longest first, each with a tip to split it. Then download the result: a proper readability report of your scores. Students check whole PDFs in one click. Teachers set the target grade and see in seconds if the class hit it. The strongest rival adds an AI report instead; we chose the workflow students actually asked for.
What Your Flesch Score Means
| Flesch score | Label | Who can read it easily |
|---|---|---|
| 90–100 | Very Easy | 5th grade (about 11 years old) |
| 80–89 | Easy | 6th grade |
| 70–79 | Fairly Easy | 7th grade |
| 60–69 | Standard | 8th–9th grade |
| 50–59 | Fairly Difficult | 10th–12th grade |
| 30–49 | Difficult | College |
| 0–29 | Very Difficult | College graduate |
Most web writing aims for 60–70 (Standard): clear for a teenager, comfortable for an adult. A school essay usually wants Grade 7–9. A research paper can sit at Grade 12 or College — but if your “easy” blog post scores 30, your readers are leaving, not learning.
Frequently Asked Questions
Is this readability checker really free?
Yes — completely free, with no account and no signup. Check as many texts and files as you like.
Does my text get uploaded to a server?
No. Every score is calculated inside your own browser. Your PDF, Word or Excel file never leaves your device, so private documents stay private.
Which file formats can I upload?
TXT, PDF, Word (.docx) and Excel (.xlsx). The dedicated site we studied accepts typed text only — no file upload at all.
What is a good readability score?
For most web writing and school work, aim for a Flesch score of 60–70 (Standard, about Grade 8–9). A score of 90+ is very easy; below 30 is very difficult. The right target depends on your reader — use the target grade setting to match yours.
What is the difference between Flesch Reading Ease and Flesch-Kincaid Grade?
They come from the same idea but answer different questions. Flesch Reading Ease gives a 0–100 score (higher = easier). Flesch-Kincaid Grade gives a school grade (Grade 8 means an 8th grader can read it). Our tool shows both, plus eight more formulas.
How many words do I need for a reliable score?
At least 100 words. With a single sentence the formulas have too little to measure, and the score is only a rough hint. Paste a full paragraph or a whole essay for a score you can trust.
Can I download my readability report?
Yes. Download your full report — all 10 formula scores, your grade level and your hardest sentences — to keep, share or hand in with your assignment.
How is this different from a word counter?
A word counter tells you how much you wrote; a readability checker tells you how hard it is to read. They work as a pair: count your words with our Word Counter, then check how clearly they read here.
Explore our other free tools: Word Counter · Case Converter · Morse Code Translator · Binary Translator