How to use
Choose the page language, add a passage, and analyze its sentence and syllable patterns.
TextoLab · Works in your browser
Readability Checker
Estimate readability with a formula selected for your language.
✓ Your text stays in your browser.
Result
How it works
English uses Flesch Reading Ease, Brazilian Portuguese uses an adapted Flesch formula, and Spanish uses Fernández-Huerta. Sentence and syllable estimates feed the score.
Understanding the result
Higher scores generally indicate simpler reading. Review highlighted long sentences for pacing.
Practical example
Review a help article and inspect long sentences before simplifying only the passages that need it.
Limitations
Readability formulas are approximations and do not measure accuracy, tone, or subject difficulty.
Common question
Is the same formula used for every language?
No. English uses Flesch, Portuguese uses an adapted Flesch formula, and Spanish uses Fernández-Huerta.
What this tool checks and changes
- Uses a formula selected for English, Portuguese, or Spanish.
- Reports sentence and syllable-based complexity.
- Identifies long sentences for focused review.
Practical uses
- Reviewing help and educational content.
- Adapting a text to a known audience.
- Finding passages that deserve a second reading.
Readability Checker
A reliable three-step workflow
The processing remains in this browser; the supplied text is not sent to an external text-processing service.
- 1
Start with the original
Paste the complete text and preserve the parts whose structure matters.
- 2
Choose only relevant options
Each option changes a specific rule. Leave unrelated settings off.
- 3
Review before using the result
Read the output in context, then copy it only after confirming the intended meaning and formatting.