Free AI Detector Tool Online: Check If Text Is AI-Written
Why Choose Lynote's Free AI Detector Tool?
99% Benchmark Accuracy
Built for high-confidence AI detection across human-written, AI-generated and mixed text, with sentence highlights that make results easier to review.
AI Content Detector for Major Models
Check writing from ChatGPT, GPT-5, Gemini, Claude, LLaMA, Mistral and other leading AI tools in one detector.
Paraphrase Detection
Spot text that has been rewritten, polished or humanized by AI instead of relying only on exact wording matches.
50+ Language Support
Use one free online AI detector for English, Spanish, French, German, Portuguese, Chinese, Arabic and more.
Secure and Private
Your drafts, essays and client documents stay private. Lynote does not use submitted text to train detection models.
AI Writing Detector with Sentence Highlights
Get AI, human and mixed scores with highlighted sentences, so you know exactly what to review next.
What is an AI Detector?
<p>An AI detector is a tool that checks whether text appears to be written by AI, written by a human, or mixed with AI assistance. It analyzes language patterns, structure, predictability, and sentence flow to estimate how likely a draft is to be AI-generated.</p><p>Lynote AI Detector is designed for real review workflows across academic writing, SEO content, business documents, and original publishing. It helps users inspect AI-written text more clearly while protecting originality and making the next editing step easier.</p>
How do AI detectors differentiate between human and AI-generated text?
<p>AI detectors look for patterns such as predictability, repeated sentence structure, low variation, and machine-like phrasing. Human writing usually shows more natural rhythm, stronger variation, and less formulaic language.</p><p>This is different from a plagiarism checker. A plagiarism checker looks for copied source material, while an AI detector estimates whether the writing itself was likely produced by AI. Using both helps reviewers evaluate originality and authenticity more clearly.</p>
How Does the AI Detector Work
<p>Lynote AI Detector analyzes writing patterns associated with AI-generated text, including predictability, repeated phrasing, sentence rhythm, and structural consistency. It compares those signals against datasets trained on both human-written and AI-written content.</p><p>After you paste text, Lynote reviews the draft, evaluates style markers, and generates an AI likelihood report with sentence-level clues. This makes it easier to understand why text was flagged and what to review next.</p>
What's the difference between an AI detector and a plagiarism checker?
<p>An AI detector checks whether content was likely generated by AI. A plagiarism checker checks whether content was copied from another source.</p><p>A piece of writing can be original but AI-generated, or copied from somewhere else without involving AI. Using both tools together helps evaluate authenticity and originality.</p>
How to Use the Free AI Detector
Paste Text or Upload a File
Add your text directly or upload a PDF, DOCX or TXT file to prepare it for AI detection.
Click Detect AI
Click Detect AI. Lynote checks sentence patterns, word choice, predictability and signals linked to AI writing tools.
Review the Results
See AI-generated, human-written and mixed scores, then review highlighted sentences before making a decision.
Paste Text or Upload a File
Add your text directly or upload a PDF, DOCX or TXT file to prepare it for AI detection.
Click Detect AI
Click Detect AI. Lynote checks sentence patterns, word choice, predictability and signals linked to AI writing tools.
Review the Results
See AI-generated, human-written and mixed scores, then review highlighted sentences before making a decision.
AI Detector Use Cases
For Blog Posts & SEO
Use an online AI detector before publishing blog posts, landing pages or product copy, so your pages sound useful, original and ready for readers.
Use an online AI detector before publishing blog posts, landing pages or product copy, so your pages sound useful, original and ready for readers.
For Essays & Academia
Review essays, assignments and research drafts with an AI text detector that shows exactly which lines need attention.
Review essays, assignments and research drafts with an AI text detector that shows exactly which lines need attention.
For Research Papers
Screen formal writing with an AI writing detector while still using author drafts, citations and human review for context.
Screen formal writing with an AI writing detector while still using author drafts, citations and human review for context.
For Professional Writing
Check reports, applications, client work and marketing copy before sharing them with an editor, teacher or team.
Check reports, applications, client work and marketing copy before sharing them with an editor, teacher or team.
Who Uses This AI Detector
Students
Use Lynote as a final check before submitting essays or assignments, especially after using AI for brainstorming or editing.
Educators
Review student writing with sentence-level AI highlights, then combine the result with drafts, context and classroom judgment.
Content Creators
Keep articles, newsletters and scripts sounding original by checking where AI wording may still be too obvious.
SEO Specialists & Marketers
Use an AI content detector to review blogs, landing pages and briefs before they go live.
HR Professionals & Recruiters
Screen cover letters, written assessments and candidate responses while keeping a human reviewer in the hiring process.
Writers & Freelancers
Check your work before delivery and use highlighted sentences to polish anything that sounds too automated.
What Users Say About Lynote
University Student
The sentence highlights made the result easy to understand. I could see exactly which parts needed another look.
University Professor
The report is clear enough to start a fair conversation with students instead of relying on one score alone.
Editor-in-Chief
Fast, clear and more useful than a single AI score. It helps me review freelance drafts before publishing.
Management Consultant
The mixed score is helpful because not every document is fully AI-written or fully human-written.
PhD Researcher
We use Lynote as an early review step for written assessments, then make final decisions with human context.
Lifelong Learner
Lynote helped me review an AI-edited draft and rewrite the parts that did not sound like me.
AI Detector FAQ
Answers to common questions about AI detector accuracy, AI checker results, false positives and privacy.
Yes. Lynote offers a free AI detector for checking text online. You can paste text or upload a document and run your first AI check without creating an account. Higher usage limits are available on paid plans.
AI detectors can be useful, but no detector is perfect. Lynote is built for high-confidence AI detection and gives sentence-level highlights so you can review the result instead of relying on one score alone.
AI detectors analyze writing patterns such as word choice, sentence rhythm, predictability and structure. AI-generated text often has smoother, more repeated patterns than human writing. Lynote checks those signals and returns AI-generated, human-written and mixed scores.
The best AI detector is accurate, transparent and easy to interpret. Look for sentence-level highlights, support for major AI models, privacy protections and clear guidance about false positives. Lynote is built for users who need fast results they can actually review.
Yes. Lynote is an AI detector free online for quick text checks. Paste your text, upload a supported file, or try an example to see AI-generated, human-written and mixed results in seconds.
An AI text detector, AI checker, AI content detector or AI writing detector analyzes writing and estimates whether it is AI-generated, human-written or mixed. Lynote also highlights the sentences that need closer review.
Yes. Lynote is designed to check writing from ChatGPT, GPT-5, Gemini, Claude, LLaMA, Mistral and other major AI tools. It also helps review text that has been edited or paraphrased after AI generation.
An AI detector checks whether text appears to be written or edited by AI. A plagiarism checker looks for copied or closely matched source text. They solve different review problems, so many teams use both.
False positives can happen, especially with short, formal, technical or highly structured writing. Review the highlighted sentences, compare earlier drafts and add specific examples or natural phrasing where needed. Do not rely on one AI score alone.
Yes. Lynote supports AI detection in 50+ languages, including English, Spanish, French, German, Portuguese, Chinese, Arabic and more.
Lynote processes text securely and does not use your submitted content to train detection models. This is important for essays, client drafts, unpublished articles, applications and internal documents.
Yes. If Lynote flags AI-heavy sentences, you can use the AI Humanizer to humanize AI text and rewrite it in a clearer, more natural voice. Always review the final text yourself before publishing or submitting it.
Humanize AI Text in Your Own Voice
If Lynote flags AI-heavy sentences, use the AI Humanizer to humanize AI text into clearer, more natural writing before you publish or submit.