Readability Analyzer
Check English reading ease, grade estimates and reading time.
Private by design
Your inputs stay on your device and are not sent to our servers. Optional usage analytics does not receive your files or tool inputs.
How to use Readability Analyzer
- Paste text, load a UTF-8 file or try the sample.
- Choose options and select Run. Review the result, counts and any warnings.
- Copy or download the result in an available format. Run again after changing inputs.
What are the limits of Readability Analyzer?
English prose only. Uses Flesch Reading Ease and Flesch–Kincaid grade formulas with heuristic vowel-group syllable counts and punctuation-based sentence splitting. Abbreviations, specialist words and short samples affect estimates. Scores may fall outside 0–100 and do not measure comprehension or writing quality. Reading time uses the chosen words-per-minute assumption. Text and files stay in browser memory and a local worker. No uploads, account access, network lookups or automatic storage. Refreshing clears your work. Input is limited to 500 KB and generated output to 1 MB; processing times out after five seconds. Downloads and clipboard copies contain the output you choose.