Show HN: Turnitindetector.ai – Free AI checker for essays, no sign-up
Turnitindetector.ai offers a free AI detection tool for essays and academic writing without requiring sign-up. It provides instant AI scores and sentence-level highlights to help students and educators review writing for AI-like patterns.
Turnitin AI Detector - Free AI Checker with Unlimited Words
Free AI checker for essays and academic drafts
Free Turnitin AI Detector
Check essays, papers, and academic drafts for AI-like writing. Paste your text and get an instant AI detection score for free.
Free AI checkerNo signup requiredInstant AI scoreSentence highlights
0 words
The AI detection result will appear here.
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Submission review
Check AI Writing Before Submission
Before submitting an essay, research paper, or academic draft, review whether your writing may look AI-generated and identify the sentences that need more human reasoning.
01
Essay Drafts
Check school essays, college papers, and short assignments before turning them in.
02
Research Papers
Review paragraphs, literature reviews, and academic explanations for AI-like patterns.
03
Academic Assignments
Scan discussion posts, reports, reflections, and application drafts in seconds.
How it works
How the AI Detector Works
A simple three-step workflow: paste your text, run the AI detection check, and review your AI score with sentence-level highlights.
1
Paste Your Text
Add your essay, paragraph, report, or academic draft into the text box.
2
Run the AI Detection Check
The checker analyzes writing patterns such as sentence rhythm, repeated phrasing, predictable structure, and AI-like academic tone.
3
Review Your AI Score
Get an instant AI probability score, risk level, and highlighted sentences that may need review.
For students
Turnitin AI Checker for Students
Students use AI writing tools for brainstorming, outlining, editing, and grammar support. This AI checker helps review academic drafts and identify sentences that may sound robotic, repetitive, or AI-like.
✎
Check Essays for AI
Review essays before submission and find paragraphs that need clearer personal reasoning.
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Review Research Papers
Scan longer academic sections for generic phrasing and repeated sentence structure.
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Scan Discussion Posts
Check short responses, reflections, and class forum posts with instant AI scoring.
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Check Application Drafts
Review statements, scholarship drafts, and application essays for natural flow.
AI score
What Your AI Detection Score Means
Use the score as a writing review signal. The higher the AI-like percentage, the more your draft may benefit from sentence-level revision.
AI Score
Meaning
Suggested Review
0–30%
Mostly human-like
Light review may be enough.
31–60%
Mixed writing signals
Review highlighted sentences and add more natural variation.
61–80%
High AI-like patterns
Revise sentence structure, tone, and examples.
81–100%
Very strong AI-like signals
Rewrite carefully and add more specific reasoning.
Benefits
Why Use This Turnitin AI Detector?
Built for fast, practical AI writing checks with a simple score and clear sentence-level feedback.
$0
Free AI Detection
Check your text for AI-like writing without paying for every scan.
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No Signup Required
Paste your text and run an AI detection check instantly.
A+
Essay-Friendly Results
Designed for essays, papers, assignments, and academic writing.
⌁
Sentence-Level Highlights
Find the sentences that may sound too predictable, robotic, or AI-generated.
Writing signals
Common AI-Like Writing Patterns We Check
The detector reviews common patterns often found in generated or heavily AI-assisted writing.
Repetitive Sentence Structure
Repeated sentence shapes can make a draft feel mechanical.
Predictable Phrasing
Generic phrases and formulaic wording may raise AI-like signals.
Generic Academic Tone
Overly polished academic wording can sound less personal and less specific.
Low Writing Variation
Strong writing usually varies rhythm, length, and paragraph flow.
Mechanical Transitions
Repeated transition words can make arguments feel template-based.
Unnatural Paragraph Flow
AI-like paragraphs may move too smoothly without specific reasoning.
Model coverage
Can Turnitin Detect ChatGPT, Claude, or Gemini?
AI writing tools such as ChatGPT, Claude, Gemini, and other language models can produce text with recognizable patterns. This AI detector checks for common AI-like signals across different types of generated or AI-assisted writing.
ChatGPTGPT-4 / GPT-5ClaudeGeminiPerplexityOther AI writing tools
User feedback
What Users Say About This AI Detector
Feedback from educators, students, and academic writers who need fast AI writing review before deeper editing.
★★★★★
“I use this AI detector as a quick reference when reviewing student drafts. The sentence-level highlights are especially useful because they show which parts may sound overly polished, repetitive, or AI-like.”
Dr. Michael Reed
University Professor
★★★★★
“This tool helps me quickly review essays and written assignments before having a deeper conversation with students. The AI score is easy to understand, and the highlighted sentences make the result more practical.”
Emily Carter
High School Teacher
★★★★★
“I wanted to check my essay before submitting it. The tool was simple: I pasted my text, got an AI score, and could immediately see which sentences needed more revision.”
Jordan Lee
College Student
★★★★★
“I used it for a research paper draft. The result helped me find paragraphs that sounded too generic, so I could add more specific reasoning and examples.”
Daniel Kim
Graduate Student
★★★★☆
“The AI detection result gave me a useful reference point. I liked that it did not just show a score, but also pointed out sentences that felt too predictable or mechanical.”
Sofia Martinez
Academic Writer
★★★★★
“I like how fast it is. No signup, no complicated settings, just paste the text and check the AI writing score. It is useful when I want to review my draft quickly.”
Maya Patel
Student Blogger
FAQ
Turnitin AI Detector FAQ
Common questions about AI detection, essay checking, and AI writing scores.
Is this Turnitin AI detector free?
Yes. You can paste text and run an AI detection check for free.
Can I check my essay for AI before submission?
Yes. The tool is designed for essays, academic papers, assignments, and other student writing drafts.
Does Turnitin detect ChatGPT?
AI detection systems may review patterns often associated with AI-generated or AI-assisted writing, including text from ChatGPT and similar tools.
What does a high AI score mean?
A high score means the text contains more AI-like writing signals, such as predictable phrasing, generic tone, or repeated structure.
How accurate is the AI detection result?
AI detection should be used as a writing review reference. Results can vary depending on text length, writing style, and editing history.
Can I use this AI checker for research papers?
Yes. You can check research drafts, literature review sections, reports, and other academic writing.
Does this AI checker work for GPT-4 or GPT-5 text?
The checker is designed to review AI-like signals across modern AI writing tools, including GPT-style text.
What should I do if my text has a high AI score?
Review highlighted sentences, add specific examples, vary sentence structure, and make sure the writing reflects your own thinking.
Check Your Essay with a Free Turnitin AI Detector
Paste your draft, get an instant AI score, and review highlighted sentences before submission.