Readability Checker — Flesch–Kincaid
Flesch Reading Ease and Flesch–Kincaid grade level, with word/sentence/syllable stats. Client-side; text never leaves your device.
How to use
- 1 Paste your text into the box.
- 2 See the Flesch Reading Ease score and Flesch–Kincaid grade level.
- 3 Word, sentence and syllable stats help you simplify dense writing.
Why use this tool
- Two standard readability scores plus the stats behind them.
- Spot long sentences and complex words that hurt readability.
- Runs entirely in your browser — your text never leaves your device.
Frequently asked questions
What is the Flesch Reading Ease score?
A 0–100 score where higher is easier. 60–70 is plain English (8th–9th grade); below 30 is very difficult (college graduate).
What is the Flesch–Kincaid grade level?
An estimate of the U.S. school grade needed to understand the text — e.g. 8.0 means an average 8th grader should follow it.
How are syllables counted?
With a vowel-group heuristic. It is accurate for most words but can miss unusual spellings, so treat the scores as estimates.
How can I improve readability?
Use shorter sentences and simpler, shorter words. Both drive the scores down toward an easier reading level.
What is Readability Checker?
A readability checker scores how easy a passage is to read using the Flesch Reading Ease and Flesch–Kincaid grade-level formulas, based on sentence length and syllable count.
Readability Checker is a free writing utility by Zerethon Tools. Flesch Reading Ease and Flesch–Kincaid grade level, with word/sentence/syllable stats. Client-side; text never leaves your device. Runs entirely in the browser — no signup, no upload.
- Category
- Writing
- Pricing
- Free
- Privacy
- Browser-based
- Signup
- Not required
Privacy
Your data never leaves your browser unless explicitly stated. Readability Checker runs entirely client-side — no server upload, no logging, no tracking of your input.
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