AI Writing Humanizer and Free Readability Score Checker
Rewrite AI-generated text to sound human. Get your Flesch-Kincaid grade level, reading time, and AI detection risk score instantly. Free, no signup.
29 AI patterns fixed
From em dash overuse to formulaic structure and AI vocabulary.
Beats major detectors
Optimized against GPTZero, Turnitin, and Originality.ai patterns.
Instant results
Powered by Claude. Results in seconds, not minutes.
5 writing styles
Casual, professional, academic, creative, or auto-detected.
Private by design
Your text is never stored. No account, no history.
5 free uses daily
Free forever. 5 humanizations per day, 1,500 chars each.
How it works
Other SEO tools
How readable is your text? Check your Flesch-Kincaid score for free
The Flesch Reading Ease score rates text on a 0 to 100 scale. Scores of 60 to 70 are standard for general audiences. Scores above 80 are easy enough for most readers. Below 30 is considered very difficult, typical of legal or technical writing. The readability panel in the tool above calculates this score instantly as you humanize your text.
The Flesch-Kincaid Grade Level converts the same formula into a US school grade equivalent. A score of 8 means an 8th-grade reading level, which most style guides recommend for web content. Tools like HemingwayApp charge a monthly fee to show these scores. The readability panel above is free and unlimited. For a deeper look at how AI writing patterns affect these scores, see our perplexity and burstiness guide.
What makes AI-generated text detectable?
AI-generated text tends to have uniform sentence lengths, predictable transitions (furthermore, moreover, in conclusion), and low variance in vocabulary. These patterns are statistically different from human writing, which varies sentence length more naturally and uses more idiomatic expressions. Run your text through the AI detection checker before and after humanizing to measure the improvement.
The AI detection risk score in the readability panel measures sentence length variance and lexical diversity. High variance and diverse vocabulary lower the risk score. After humanizing, compare the before and after word frequency lists to see which overused AI vocabulary was replaced. For a complete breakdown of what detectors look for, read the how to bypass AI detection guide. The goal is not to trick detectors but to write content that genuinely reads as human.
How to improve your Flesch Reading Ease score
Shorten your sentences. Aim for an average of 15 to 20 words per sentence. Replace long words with shorter alternatives where meaning is preserved. Break paragraphs at 3 to 4 sentences maximum. These changes alone typically raise your Flesch score by 10 to 20 points, which is exactly what the humanizer does in one click.
The before and after readability comparison above shows exactly how much the humanizer improves your score in one step. For content that needs to reach a broad audience, target a Flesch score above 60 and a grade level below 9. For technical audiences, a grade level of 10 to 12 is acceptable. Marketing copy works best at grade 5 to 6. If you need to write original content at the right reading level from the start, try our AI writer tool which targets your chosen grade level directly.
Frequently asked questions about AI humanizing and readability
How do I humanize AI-generated text for free?
Paste your AI-generated text into the input above (up to 1,500 characters) and click Humanize. The tool rewrites the text to sound more natural and human-written. You get 5 free humanizations per day with no signup required.
What is the Flesch Reading Ease score?
The Flesch Reading Ease score rates text on a scale of 0 to 100. Higher scores mean easier to read. Scores of 60 to 70 are considered standard for general audiences. Scores below 30 are very difficult and typical of academic or legal writing.
What is a good Flesch-Kincaid grade level for web content?
Most web content reads best at a grade level of 6 to 8, which corresponds to a Flesch Reading Ease score of around 60 to 70. Marketing copy often targets grade 5 to 6. Academic writing typically sits at grade 12 or above.
How does this tool calculate AI detection risk?
The AI detection risk score analyzes sentence length variance, vocabulary diversity, and frequency of common AI phrases. High variance in sentence length and diverse vocabulary lower the risk score. The score is an estimate and should not be used as a guarantee.
Will humanized text pass AI detectors?
Humanizing text reduces AI detection signals by varying sentence structure and vocabulary. No tool guarantees 100% undetectable output because AI detectors update constantly. The best approach is to edit the humanized output yourself before publishing.
What is the character limit for the humanizer?
The humanizer accepts up to 1,500 characters per request. For longer content, split your text into sections and humanize each one separately. The readability score checker works on the full output with no character limit.
How many times can I use the humanizer per day?
You get 5 free humanizations per day per device. The readability score analysis is unlimited and does not count toward your daily limit. The limit resets at midnight.
How do I improve my readability score?
Shorten sentences to under 20 words on average. Use common words instead of complex vocabulary. Break long paragraphs into 2 to 3 sentences. Active voice reads easier than passive voice. The score updates after each humanization so you can compare before and after.
Is my text data safe when I use this tool?
Your text is sent to the Anthropic Claude API for humanization and is not stored by Vortenza after processing. The readability score calculation happens entirely in your browser. Do not paste confidential or sensitive information into any online tool.
What is the difference between humanizing and paraphrasing?
Paraphrasing restates the same content in different words while preserving meaning. Humanizing specifically targets the patterns that make AI-generated text sound robotic: uniform sentence length, overused transition words, and predictable structure. This tool does both simultaneously.