Free readability checker
Write so everyone understands.
Paste any text to see its grade level, reading ease and reading time, then find the exact words and sentences that make it hard to read.
No sign-up. Your text stays in your browser.
18 scores, one glance
Flesch-Kincaid, Gunning Fog, SMOG, Dale-Chall, Lexile, CEFR and more, each with a plain-English verdict.
Know what to fix
See unfamiliar words, long sentences, filler, hedge and weasel words, so you know exactly what to change.
Private by design
Analysis runs in your browser. Your text never leaves your device unless you choose to share a link.
Bring any document
Paste text or drop in a PDF, Word (.docx) or text file. Export a clean PDF report when you are done.
For teachers
Classroom tools that print beautifully
Make worksheets in a minute. Every puzzle can be played on screen or printed with an answer key.
Learn
Every readability formula, explained
What each score measures, how it is calculated and when to use it. Each guide includes a checker for that score.
More formulas
Language levels
FAQ
Questions, answered
What is a good readability score?
For most web pages, emails and general audiences, aim for a Flesch-Kincaid grade of 8 or lower and a Flesch Reading Ease of 60 or higher. Technical or academic writing can score higher, but shorter sentences and everyday words help every reader.
Which formula should I use?
Flesch-Kincaid Grade Level is the most widely used. Dale-Chall is good for school texts, SMOG for health information, Spache for young readers and FORCAST for forms and technical documents. The consensus grade combines eight formulas.
Is my text safe?
Yes. All scores are calculated in your browser and nothing is uploaded. Only if you create a share link is the text saved on our server, where anyone with the link can see it until it expires.
Which files can I upload?
Plain text (.txt, .md), HTML, PDF and Word (.docx) files. Text is extracted on your device.
Is it free?
Yes. Every tool on Readabilit is free to use, with no sign-up needed. An optional account lets you manage your shared texts.