Flesch-Kincaid Readability Test
Paste your text and get its Flesch-Kincaid grade level and reading ease score right away.
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What Do These Scores Actually Mean?
Flesch-Kincaid Grade Level estimates the US school grade a reader would need to understand your text on a first read. Lower numbers mean simpler writing. Flesch Reading Ease is a 0–100 scale — higher numbers mean easier text, and a score in the 60s or 70s is considered easy for most adults to read. Most general web content reads best between grade 6 and grade 9, roughly the level of a national newspaper.
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, vocabulary and repetitive transitions reduce reading ease.
AI text tools generate smooth paragraphs by studying likelihood patterns. Yet, simpler words and crisp transitions make the writing much clearer for everyone.
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. |
Everything happens in your browser, not on a server
Unlike tools that upload your text to a server for processing, this runs entirely as JavaScript on your device. Nothing you paste in is sent anywhere, logged, or stored.
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Engineered for rapid workflow automation across copywriting, publishing, engineering, and academic review.
AI Text Detector
Check AI score & highlight ChatGPT text with statistical burstiness flags.
Remove AI Buzzwords
Strip delve, tapestry, and LLM clichés commonly generated by default models.
Strip AI Prompts
Clean Midjourney & SD flags (--ar, --v) and prompt meta parameters.
Invisible Visualizer
Inspect zero-width spaces with inline tags and hex identity badges.
Readability Score
Calculate Flesch-Kincaid grade level, sentence complexity, and reading ease.
Clean ChatGPT Text
Remove markdown symbols, conversational filler, and AI formatting quirks.
PDF Metadata Cleaner
Purge author info, revision history, creator stamps, and embedded metadata.
Homoglyph Sanitizer
Normalize lookalike Cyrillic glyphs and mixed character sets back to pure ASCII.
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.
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Advanced Heuristic Detection
Isolates stylistic anomalies, token-length variance, and syntactic LLM patterns automatically.
Multi-Language Static Support
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Visual Highlight Breakdown
See the exact unicode positions where zero-width spaces, soft hyphens, and marks were purged.
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Your questions, answered
What is a good Flesch-Kincaid score for a website?expand_more
Somewhere between grade 6 and grade 9 works for most general content. Aim lower if your audience includes non-native English readers.
What is Flesch Reading Ease?expand_more
A 0–100 scale where higher numbers mean easier text. A score of 60–70 is considered plain English.
Does sentence length matter more than word choice?expand_more
Both matter, but long sentences are usually the bigger problem. Breaking one 40-word sentence into two shorter ones often improves the score more than swapping a few words.