Readability & Flesch-Kincaid Grade Checker
Calculate Flesch Reading Ease, Flesch-Kincaid Grade Level, Gunning Fog Index, and highlight complex 3+ syllable words in real-time.
Private. 100% Browser-based processing. Zero server storage.
All-In-One Text Sanitization Suite
Stay ahead with our AI text processing tools
AI Text Detector
Check AI score & highlight ChatGPT text
Remove AI Buzzwords
Strip delve, tapestry, and LLM clichés
Strip AI Prompts
Clean Midjourney & SD flags (--ar, --v)
Invisible Visualizer
Inspect zero-width spaces with badges
Readability Score
Calculate Flesch-Kincaid grade level
Case Converter
Convert Title Case, camelCase & Slugs
PDF Metadata Cleaner
Wipe author, creator & timestamp EXIF
Homoglyph Sanitizer
Sanitize Cyrillic/Greek look-alikes
How Readability Scores Improve Content Ranking & Conversions
Readability metrics quantify how accessible your writing is to readers. The Flesch Reading Ease test rates text on a 0-100 scale, while the Flesch-Kincaid Grade Level indicates the US grade level required for comprehension. Lowering grade levels to Grade 7-8 significantly increases time-on-page and organic search rankings.
See the Difference Before & After Cleaning
Hidden artifacts and zero-width characters cause unexpected layout shifts, regex crashes, and AI detector flags. Here is how clean text compares.
Artificial intelligence text generators create fluent paragraphs by analyzing probability patterns. However, complex vocabulary and repetitive transitions can reduce reading ease.
Flesch Ease: 65.4 (Plain English) | Grade Level: 8.2 | Complex Words: 2
Technical Character & Feature Breakdown
Our browser engine detects and strips non-printable unicode points, LLM clichés, and metadata streams automatically.
| Character / Flag Name | Identifier / Sample | Impact & Behavior |
|---|---|---|
| Flesch Reading Ease (0–100) | Score: 60-70 | Measures sentence length and syllable count. Higher scores mean easier reading (60-70 is ideal for web). |
| Flesch-Kincaid Grade Level | Grade 8 | Calculates the US school grade required to easily understand the text. |
| Gunning Fog Index | Fog Score | Estimates formal education years needed to comprehend complex academic prose. |
| Complex Words Count | 3+ Syllables | Highlights long vocabulary words that reduce reader engagement. |
Understand how our AI detection & text sanitization engine works
Unlike cloud-based checkers that upload your documents to external databases, our detection engine analyzes string perplexity, sentence length variance, and transition density 100% inside your browser memory. Your drafts remain confidential, safe from unauthorized data logging.
3 Simple Steps to Use Readability & Flesch-Kincaid Grade Checker
No software installation, account registration, or cloud API keys required. Processed entirely inside your local browser.
Paste Document or Essay Text
Paste your draft, article, or blog post into the text area.
Instant Score Calculation
Our algorithm evaluates word count, sentence length, and syllable counts live.
Optimize Complexity
Review highlighted 3+ syllable complex words to simplify your writing for higher engagement.
// Instant local inspection
✓ 0 Invisible Characters
✓ AI Buzzwords Stripped
✓ 94% Human Rhythm
Clean and check AI content anywhere — 100% Client-Side Privacy
Whether you are drafting articles on mobile, writing academic papers on laptop, or sanitizing code comments, our browser engine runs locally with zero installation and zero cloud data retention.
- Instant local processing — no network latency or queues
- Zero server storage — your content never leaves your device
- Compatible with all modern web browsers & mobile devices
Why Choose AI Text Cleaner
Built for security, speed, and clean text output
100% In-Browser Privacy
Your text is processed locally in browser memory. Nothing is sent to external servers or logged in databases.
Instant Processing
Zero network latency, zero API rate limits, and zero queues. Analysis runs immediately as you type or paste.
Advanced Heuristic Detection
Scans sentence length burstiness, perplexity variance, and overused LLM transition phrase clichés.
Multi-Language Static Support
Supports 11 static language routes ensuring seamless user experience across international audiences.
Visual Highlight Breakdown
Color-coded inline sentence markers reveal exact locations of suspected AI phrases and formatting quirks.
Zero Account Required
No signups, no subscriptions, and no credit card required. Free, open, and accessible to everyone.
Your questions, answered
Got questions about zero-width characters, AI detection probability, or privacy? We have answers.
What is a good Flesch Reading Ease score for web articles?
A Flesch Reading Ease score between 60.0 and 70.0 (Grade 8 level) is recommended for general web audiences and blog content.
How is the Flesch-Kincaid Grade Level calculated?
It combines average sentence length (words divided by sentences) and average syllables per word to compute a standard US school grade.
Why should I simplify complex words?
Replacing 3+ syllable jargon words with simpler alternatives increases reader retention, lowers bounce rates, and improves SEO performance.
Is my document stored during analysis?
No. Readability analysis is computed 100% in-browser. Zero text is uploaded or stored.