Readability Score
Flesch Reading Ease, Flesch-Kincaid grade & SMOG index — local.
See how it works
Watch a quick simulation of this tool in action — no file needed.
How to use Readability Score
Follow these steps — everything happens instantly in your browser.
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Step 1. Paste your text into the input box — scores update live as you type.
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Step 2. Review the count cards: words, sentences, syllables, characters, averages.
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Step 3. Read the three formula scores: Flesch Reading Ease, Flesch-Kincaid grade, SMOG index.
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Step 4. Use the color-coded ease scale to gauge how difficult your text is to read.
Why use this tool
Private by design
All processing happens locally in your browser. Open DevTools → Network and you'll see zero file uploads. Ever.
Instant
No upload wait, no queue, no server round-trip. Results appear the moment you drop a file.
Free & unlimited
No accounts, no watermarks, no daily caps. Use it as many times as you like, forever.
Works everywhere
Desktop, tablet or phone — every tool is responsive and installable as a PWA for offline use.
Frequently asked questions
Everything you might want to know about readability score.
Word Counter
Live word, character, sentence & reading-time stats — private.
Text Statistics
Flesch Reading Ease, Flesch-Kincaid Grade & readability metrics.
Keyword Density
Top 20 keywords with counts & density % — stop words excluded.
Case Converter
UPPER, lower, Title, Sentence, camelCase, snake_case & more.