01
A simple sentence
Paste "The cat sat on the mat. It was a sunny day." and the checker returns a high Flesch reading ease score near 100 with a low grade level around grade 1-2, showing very easy text.
Readability Checker
Text ToolsCheck readability with Flesch Reading Ease and Flesch-Kincaid grade level — free online.
Scores use the Flesch reading ease and Flesch-Kincaid grade formulas. Syllables are estimated, so treat the numbers as a guide rather than an exact measure.
About
About the Readability Checker
Scores your text with the Flesch reading ease formula and the Flesch-Kincaid grade level to show how easy it is to read.
Content writers use it to keep articles accessible to a general audience, while students check that a paper matches an expected reading level. It's one of many free text tools on Toolapt, and like every tool here, it's free to use with no sign-up and no limit on how many times you run it.
Examples
Readability Checker examples
3 worked examples
02
A dense technical paragraph
Paste a paragraph full of long words and long sentences, such as legal or academic writing, and the score drops toward 30-50 with a grade level around 12 or higher, showing harder text.
03
Editing to simplify
Shorten your sentences and swap long words for shorter ones, then click Check readability again — the Flesch score rises and the grade level drops as the text gets easier to read.
Related tools
FAQ
Frequently asked questions
Quick answers to common questions about the Readability Checker.
What does the Readability Checker do?
It scores your text using the Flesch reading ease formula and the Flesch-Kincaid grade level, giving you a sense of how easy the text is to read.
Is the Readability Checker free to use?
Yes. It's free, with no sign-up, no watermark and no limit on how many times you use it.
Is my text safe when I use this tool?
Yes. Your text is processed entirely on your own device — nothing is sent to a server.
What does the Flesch reading ease score mean?
It's a 0-100 scale where higher scores mean easier reading; roughly 60-70 is considered easily understandable by most adults, while lower scores indicate more difficult text.
What does the Flesch-Kincaid grade level mean?
It estimates the US school grade level someone would need to have reached to understand the text easily, for example a score of 8 suggests eighth-grade reading level.
How accurate is the syllable counting?
Syllables are estimated using a standard algorithm rather than a dictionary lookup, so treat the scores as a helpful guide rather than an exact measurement.
How much text do I need for an accurate score?
At least a couple of full sentences; very short snippets can produce scores that swing widely because there's too little data to average.
Does the Readability Checker have any limitations?
It's built for standard English prose; text with lots of proper nouns, abbreviations or unusual formatting may affect the syllable estimate and skew the score slightly.