Free AI Text Detector

You can easily write high quality human-written content in real time with the most accurate AI detector for ChatGPT, Gemini and Claude.

Content

Supports TXT、DOCX、PDF
Try Example:

Result

AI-generated?%
Mix-generated?%
Human-written?%
?%

Add text and click “Detect AI” to see the results.

Highlighted AI-Generated/Paraphrased Sentences

List sentences likely AI-generated here

Recent History

350K+Scans Performed Monthly

99%Accuracy Rate

4.9Average Rating from 12,589 Users

Best AI Writing Detector with High Accuracy

With the most reliable AI content detector to improve your content marketing and writing to the next level in 2026.

Large Language Model

Our AI text detector mainly analyzes language patterns that may reflect how large language models generate content. In fact, it's also used to find overly consistent wording, predictable word order, general explanations and smooth transitions throughout the entire text. This AI detector not only provides general AI scores but also helps you identify text that may follow AI-generated writing - especially suitable for detecting social media posts, essays, emails and SEO content.

Sentence Structure

From sentence length and grammatical structure to transitions and paragraph rhythm, you can immediately identify between AI written content and human writing with our AI writing detector. It could flag content that repeatedly uses the same sentence structure and extremely similar paragraph construction. Writers can also use these insights to improve readability of content.

Writing Process

Human writing is usually a process that is constantly refined over time. During this period, the author may push the viewpoints, add some facts, or create equal opportunities of imagination for readers between different chapters. The content generated by artificial intelligence often appears more uniform because it may only need to be generated once. This is also one of the key features of the Lunote AI detector for writing - we try to look for signs of the natural development of the content during the writing process. It examines how ideas progress, whether examples feel specific to the topic, and whether the writer's reasoning changes or deepens from one section to the next.

Word Choice

In fact, most outstanding authors prefer to use common words in their content creation to express their viewpoints or explain some facts. However, the AI generated text usually contains a large number of unfamiliar words so that readers often feel confused about this. With the latest machine learning model, the accurate AI detector has learned the application scenarios in over 100 languages. It does not mark individual words but assesses the way language is expressed in context, helping you identify paragraphs that might seem formulaic or machine-generated.

Writing Style

Lunote does not focus on individual sentences but assesses the overall reading experience of the content - whether the content continues a way of thinking in the human writing process. This analysis based on writing style will help identify AI generated content. Whether you are a writer, educator, editor or content creator, our AI text detector will help you create more genuine and simply different ontent.

High Accuracy

Accurate AI detection requires more than a single algorithm or a simple percentage score. From large language model and sentence structure to writing style and word choice, the AI text detector combines multiple layers of analysis to get reliable detection results. By evaluating content from different perspectives instead of relying on one indicator, the detector reduces false positives and provides a more accurate assessment of whether text may have been AI-generated.

Detect ChatGPT and Other AI Models

Check text generated by ChatGPT, GPT, Gemini, Claude, and other leading AI writing tools. Our AI detector helps you determine whether content may have been created or assisted by generative AI.

Sentence-Level AI Detection

Find effortlessly the parts of your text that may have been generated by AI. Sentence-level analysis highlights suspicious passages so you can review specific sections instead of checking the entire document manually.

Detect AI-Humanized & Mixed Content

It's a snap to find content that combines AI-generated and human-written text. The detector helps identify AI-assisted passages even when a document has been edited, rewritten, or blended with original human writing.

How to Use the Free AI Detector

Paste Text or Upload a File

Add your text directly or upload a TXT, DOCX, or PDF document.

Click Detect AI

Start the scan and let Lunote examine writing patterns and model-linked signals.

Review the Results

Read the AI, mixed, and human scores together with sentence-level clues.

How Lunote AI Detector Detects AI Written Text

The tool detects patterns typical for AI writing, such as repetitions, predictable rhythm of sentences, limited vocabulary, and structured models. Lunote transforms the patterns into a report indicating AI likelihood with hints at the sentence level to help you analyze suspicious pieces more efficiently.

Input and Signal Scan

IN

Text Input

Possible AI-written content pasted for review

With AI writing tools becoming increasingly popular, the way modern companies write, edit, and publish their content undergoes changes. The use of AI tools helps automate processes, speed up work, and ensure consistency in the output. It is crucial to evaluate whether a certain piece was written solely by humans, with the use of AI, or created by an AI model.

AI Detection Result

AI likelihood overview

AI-generated
Mix-generated
Human-written
10%Human-like
Detected signals
Review summary
More humanClear reportSentence clues
How Lunote's AI detector works

The AI detector analyzes patterns often characteristic of AI writing, including repetitions, predictable sentence rhythm, limited variation, and phrasings linked to models.

ChatGPTGeminiClaude
85%Likely AI
High repetition
Predictable rhythm
Low lexical variance
Pattern repetitionUniform sentence rhythmSentence-level explanationHuman-likeness score

How to Interpret Your AI Detection Report

The value of an AI score depends on your interpretation. Lunote guides you through the overall score, mixed writing detection, and highlighted sentences.

AI detection report dashboard

The AI detection report helps you understand what Lunote detected in your text:

  • AI score: resemblance to AI-written text.
  • Mixed writing score: human and AI-written parts.
  • Human-written score: resemblance to human writing.
  • Highlighted sentences: lines that deserve detailed review.
  • Context is important: formality and technical language can affect the result.

Lunote Detects AI Text from ChatGPT, Claude, and Gemini

Lunote does more than label a draft as AI or human. It identifies model-linked writing habits, explains why text feels synthetic, and highlights the patterns users should review first.

Our detector is designed to catch common traits found in major AI models while still giving users practical, readable feedback. Instead of relying on one signal alone, Lunote compares rhythm, phrasing, predictability, and structure across a broader review workflow.

ChatGPT-style phrasing

Identifies low variance, smooth writing, safe sentence progression, and generalizations frequently found in outputs from OpenAI-like models.

Claude-style structure

Identifies analytical, well-balanced structure and perfectly symmetrical paragraph progression that seems overly consistent.

Gemini-style synthesis

Flags conversational but dense synthesis, fact-heavy compression, and transitions that sound smoothly generated.

What Lunote checks first

Core review signals include repetition, sentence rhythm, lexical variance, predictability, and detector-aware phrase patterns.

ChatGPTClaudeGemini

Core detection signals

Pattern repetitionHigh
Sentence rhythmMedium
Lexical varianceMedium
Model similarityHigh
99%

Benchmark accuracy for fast AI review workflows

50+

Languages supported across global AI content checks

1 View

Clear detector summary with sentence-level clues

What Should You Do If Your Text Was Flagged as AI?

01

Analyse the Report Thoroughly

Do not focus solely on the score. Review which elements were detected as artificial and compare each suspicious fragment with the rest of your text.

02

Examine Your References

Use notes, outlines, citations, and edit history to establish the origin of the work and its writing process.

03

Revise the Most Artificial Parts of the Paper

Improve only the fragments that appear most suspicious. Clarify general claims, specifics, transitions, and sentence rhythm.

04

Don’t Over-Edit Your Work

Repeated rewrites can make a text feel overly polished and more suspicious. Preserve your natural voice.

05

Test It Again After Editing

Check the edited version again. Strong revisions usually have clearer sentences, less repetition, and a more human rhythm.

06

Adhere to Guidelines Specific to Your Case

Follow the rules of your college, editor, or employer and disclose writing-tool use when required.

Detect AI Text

Lunote AI vs. Other AI Detectors

Compare how Lunote stands out across the factors users care about most.

FeaturesLunoteGPTZeroZeroGPTQuillBotGrammarlyDecopyPaperpalCopyleaksMyDetAI Detector
Overall detector workflowBest all-aroundAcademic-firstBasic scanWriting add-onEditing-firstMixedAcademic supportEnterprise-firstBasic scanSingle-purpose
Sentence-level highlightsYesYesNoNoNoNoNoYesNoNo
Clarity of result explanationVery clearClearBasicBasicLimitedMixedModerateClearBasicBasic
Multi-model AI detection coverageBroadGoodGoodModerateModerateModerateModerateBroadBasicModerate
Language support50+ languagesEnglish-firstPopularPopularPopularLimitedAcademic EnglishMulti-languageLimitedEnglish-first
Fast no-friction reviewFastestModerateFastModerateModerateModerateModerateModerateFastSlow
Best choice for most usersYesNoNoNoNoNoNoNoNoNo

AI Detector Use Cases

For Blog Posts & SEO

Use an online AI detector before publishing blog posts, landing pages, or product copy.

For Essays & Academia

Review essays, assignments, and research drafts with sentence-level feedback.

For Research Papers

Screen formal writing while keeping author drafts, citations, and human review in context.

For Professional Writing

Check reports, applications, client work, and marketing copy before sharing.

Who Uses This AI Detector

Students

Before submitting an essay, research paper, or assignment, students can check their writing for patterns commonly associated with AI-generated text and make sure their work reflects their own ideas and voice.

Teachers & Educators

From classroom assignments to research papers, educators can review student submissions with an AI content detector and gain an additional perspective when assessing originality, authorship, and writing patterns.

Writers & Freelancers

Whether you're preparing a client article or polishing your next draft, an AI writing detector helps writers and freelancers review their content and maintain an authentic, consistent writing style.

Content Creators & Publishers

Bloggers, publishers, and digital creators can check articles, scripts, newsletters, and other content before publication to identify potentially AI-generated passages and maintain high editorial standards.

SEO Specialists & Marketers

For teams producing content at scale, an AI text checker provides a quick way to review AI-assisted articles, landing pages, product descriptions, and marketing copy before they reach your audience.

Researchers & Professionals

When originality and authorship matter, researchers and professionals can analyze papers, reports, and business documents for signals of AI-generated writing while keeping human judgment at the center of the review process.

What People Say About Us

Jamie C.

College Student

The highlights show me which parts of my draft may sound AI-written, so I know where to add my own examples and rewrite the wording.

Morgan F.

Managing Editor

I use the AI score as a quick first check, then review the highlighted sentences and decide which ones need a more natural voice.

Theo W.

SEO Writer

It helps me find repetitive transitions and generic phrases in my drafts. I can revise those sections without changing the main message.

Nia K.

Writing Tutor

The sentence-level feedback makes it easier to show writers where their work sounds too polished or formulaic and where their own voice could come through more clearly.

Ben S.

Content Manager

I check the draft again after editing to compare the results. It gives our team a simple way to see whether the writing feels less automated.

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YouTube Transcript

Frequently asked questions

An AI detector analyzes language patterns and estimates whether text is human-written, AI-generated, or a mixture of both.