Text Readability Checker
Score copy with Flesch reading ease and grade level.
Online Tool
Tool Working Principle
Applies the Flesch Reading Ease and Flesch–Kincaid Grade Level formulas: 206.835 − 1.015 × ASL − 84.6 × ASW for ease; 0.39 × ASL + 11.8 × ASW − 15.59 for grade. Syllable count is approximated by vowel-cluster segmentation.
Step-by-Step Usage Tutorial
- 1Paste the text you want to evaluate.
- 2Read the metric cards and the recommendation panel.
- 3Rewrite long sentences or replace complex words to raise the ease score.
Frequently Asked Questions
Do these readability scores work on non-English text?+
No. Flesch Reading Ease and Flesch–Kincaid Grade Level were calibrated on English prose, and both the constants and the syllable model assume English word structure. Running Chinese, Japanese, German, or Arabic through them produces a number with no meaning. Use them for English copy only.
How exact is the syllable count?+
It is an approximation. Syllables are estimated by segmenting vowel clusters, which over-counts words like "queue" and under-counts words like "rhythm" or "fire". The trend across a rewrite is reliable; the absolute number is not, so do not chase a specific decimal.
What reading ease score should I aim for?+
Roughly 60–70 reads as plain English for a general audience, 50–60 as fairly demanding, and below 50 as difficult. Editorial, academic, and technical copy often sits in the 40s legitimately — a low score is a signal to check whether the difficulty is intentional, not an error to fix.
Where does the 1.25× size-contrast threshold come from?+
It is a typographic convention, not a standard. Adjacent levels in a type scale that differ by less than about 1.25× tend to read as the same level, so the hierarchy collapses. Note that WCAG says nothing about size ratios — its contrast requirements concern colour, which this tool does not measure.
Does the repeat checker ignore common words?+
Partly. It only counts words of three or more letters, so "a", "an", "of", and "to" never appear, but frequent connectives like "that", "with", and "from" still show up. Repetition is also a legitimate rhetorical device — read the flagged phrase in context before rewriting it.
Do I need an account to use Readability Checker?+
No. Every tool on TypoStudio.tools runs fully in the browser with no account, email, or API key.
Is my input text stored anywhere?+
No. All processing happens locally in your browser. Nothing is uploaded, logged, or shared with a server, and closing the tab discards everything.
Can I use the output commercially?+
Yes. Generated Unicode strings and CSS snippets are yours to use in commercial and personal work with no attribution required.
Which browsers are supported?+
The latest two versions of Chrome, Edge, Safari, and Firefox on desktop, tablet, and mobile.