AI Detector

AI Detector identifies AI-generated text and shows the exact sentences an AI language model wrote. AI Detector scans pasted text or an uploaded file, returns an AI score from 0 to 100 percent, and marks every flagged sentence for review. The tool runs free, requires no sign-up, and works on essays, articles, reports, and business copy.

Text to scan

Upload

0 / 500 · 0 words

Ctrl or Cmd + Enter

AI-like signals

Paste text and run Detect AI. Flagged spans and a 0 to 100 score appear here.

What Is An AI Detector?

An AI detector is a tool that estimates whether text was written by a human or generated by an AI language model. AI Detector reads submitted text and measures statistical patterns such as perplexity and burstiness. The detector returns an AI score from 0 to 100 percent with the specific sentences that read as machine-generated. The score is a probability estimate that supports a human review, not a final verdict on authorship.
Does AI Detector Detect ChatGPT, Claude, And Gemini?

Yes. AI Detector detects text from ChatGPT, Claude, and Gemini, along with GPT-5, GPT-4, o3, Claude Sonnet, Gemini 2.5, Llama, DeepSeek, Grok, Perplexity AI, Mistral, Copilot, and Jasper. The detector analyzes the statistical patterns shared across large-language-model output, so it flags text from a new model version without a separate update for each model.

The tool runs free, requires no sign-up, and works on essays, articles, reports, and business copy.

See Every Flagged Sentence

AI Detector returns an AI score from 0 to 100 percent and highlights every flagged sentence in the text. The detector marks AI-likely sentences with color-coded highlights, then attaches an explainer card to each one describing why the sentence reads as machine-generated. This sentence-by-sentence detection replaces a single vague percentage with a per-sentence breakdown. A reviewer sees exactly which passages raised the AI likelihood estimate and how confident the model is about each.

AI Checker reports a confidence score alongside the AI score. The confidence score states how strongly the model supports its own estimate, which helps a reviewer separate a borderline result from a clear one.

Fix AI Traces With Rewriting

AI Detector rewrites flagged phrases directly inside the results view with a one-click, in-line rewrite. The rewrite humanizes flagged text by paraphrasing the machine-written passage, adding a natural personal voice, and removing the repetitive patterns that mark AI writing. The rewrite preserves the original meaning of the sentence. After an edit, AI Checker re-scans the revised text and returns an updated AI score, so a writer confirms the change lowered the AI likelihood before publishing.

The detect-and-rewrite path runs in one place. A writer does not export flagged text to a separate humanizer, because AI Detector connects detection to the rewrite step inside the same view.

Detect Every AI Model

AI Detector detects text from every major large language model, including ChatGPT, GPT-5, GPT-4, GPT-4.1, and o3 from OpenAI. The detector also identifies output from Claude and Claude Sonnet 5, Claude Opus 5, Gemini and Gemini 2.5, Llama, DeepSeek, Grok, Perplexity AI, Mistral, Copilot, and Jasper. AI Detector analyzes the statistical patterns shared across LLM-generated text rather than a single model's fingerprint. The detector flags output from new model versions without a separate update for each one.

ChatGPT
Claude
Gemini
Copilot
DeepSeek
Grok
Perplexity
Llama

Highly Accurate & Reliable Results

AI Detector trains on more than 5,000 samples of human-written and AI-generated text to keep a low false-positive rate. The detection model is benchmarked and continuously retrained on new human and machine writing, which keeps the AI likelihood estimates reliable as language models change. AI Checker reports a probability, not a verdict, so a low false-positive rate protects human writers from a wrong accusation.

Explore All Detection Features

AI Detector groups seven supporting detection features beside the core scan. These features cover mixed human-AI text, fairness for second-language writers, text privacy, scan speed, platform access, language support, and shareable reports. Each feature below adds detail to a single AI detection workflow.

Detect Mixed Human-AI Text

AI Detector detects mixed documents that combine human-written and AI-generated passages through line-by-line analysis. The detector distinguishes fully AI-written text from human-written text and from AI-refined text, then flags the partial-AI sections rather than labeling the whole document. This mixed-document detection matters because most flagged writing blends both sources.

Stay Fair For ESL Writers

Detector reduces false flags on writing from non-native English speakers through ESL de-biasing. The detector accounts for the simpler sentence structures and repeated phrasing common in second-language writing, which older detectors often misread as machine-generated. This fair analysis protects English-as-a-Second-Language writers from a wrong AI flag on genuine human work.

Keep Your Text Private

AI Detector protects submitted text through a privacy-first design that keeps content secure. The detector does not publish or expose the text a user submits, so unpublished drafts, research, and confidential business documents stay private during and after the scan. Data protection applies to every scan by default.

Get Results In Seconds

AI Detector returns an AI score in seconds through real-time analysis. The detector processes a standard document and displays the sentence-level highlights and score without a queue, so a reviewer reads results immediately after clicking Detect. Instant detection supports back-to-back document checks in one session.

Scan In Multiple Languages

AI Detector runs multilingual detection across six supported languages: English, Spanish, French, German, Portuguese, and Italian. The detector applies the same sentence-level scoring in each supported language, so a reviewer checks non-English content without a separate tool.

Download Shareable Reports

AI Detector exports a downloadable PDF report of every scan. The report is branded with the Claude Watermark Remover logo and name, and it records the AI score, the flagged sentences, and the issue cards. A writer attaches the report to an assignment or deliverable as evidence of a completed check.

Check AI In Three Steps

AI Detector runs a full AI check in three steps: paste or upload text, run the scan, and review the results. Each step below completes one stage of the workflow, from input to a final reviewed score.

Paste Or Upload Text

AI Detector accepts text through a paste field or a document upload. A user pastes text directly or uploads a document that meets the minimum word count and character limit for an accurate scan. A longer sample improves accuracy, because more text gives the detector more statistical signal.

Run The AI Scan

AI Detector runs the scan after a user clicks Detect. The detector analyzes the submitted text and generates an AI score from 0 to 100 percent. The scan completes in seconds and returns the sentence-level highlights with the score.

Review Your Results

AI Detector displays the final score, the flagged sentences, and an explainer card for each flag. A user reads the explainer cards to understand why each sentence was flagged, edits or rewrites the flagged text, and re-scans the edited text to confirm a lower AI score.

Detect AI In Any Content

AI Detector checks four main content types for AI-generated text: academic work, web content, business documents, and marketing copy. Each content type below names the specific documents the detector scans within that category.

Check Essays And Papers

AI Detector checks academic writing, including essays, research papers, school assignments, coursework, and dissertations. The detector returns a sentence-level AI score that an educator or student reviews as one signal within a wider academic-integrity check, not as a final verdict.

Review Blogs And Articles

AI Detector reviews web content, including blog posts, articles, Search Engine Optimization (SEO) content, and published content. The detector flags AI-generated passages before publication, which helps an editor confirm that a submitted article meets a human-authorship standard.

Scan Reports And Emails

AI Detector scans business documents, including reports, proposals, emails, and other business documents. The detector confirms whether internal or client-facing text was written by a person, which supports a company's disclosure and quality standards.

Verify Resumes And Copy

AI Detector verifies application and marketing text, including resumes, cover letters, product descriptions, campaign copy, and social captions. The detector flags AI-generated sections so a recruiter or marketer reviews the authenticity of high-stakes copy before acting on it.

Who Uses AI Detector

AI Detector supports four writer groups: students, educators, writers and creators, and marketing teams. Each group below uses the same detection engine for a different purpose.

Support Students

AI Detector helps students confirm the originality of their own coursework before submission. A student scans a draft, reviews the flagged sentences, and edits any passage that reads as AI-generated to meet an academic-integrity standard.

Empower Educators

AI Detector gives educators and teachers a sentence-level signal for reviewing submitted work. An educator treats the AI score as one input in a wider review, reads the explainer cards, and discusses flagged passages with a student rather than issuing an automatic judgment.

Help Writers And Creators

AI Detector helps writers, content creators, and bloggers verify that published work reads as human-authored. A creator scans a draft, rewrites flagged phrases in place, and re-scans to confirm the final text meets a personal or platform standard.

Serve SEO And Marketing Teams

AI Detector serves SEO professionals, digital marketers, publishers, editors, businesses, and content teams that publish at volume. A content team scans articles before publication, downloads the shareable report, and keeps a record of the authenticity check across a large content library.

Choose Our Detector Confidently

AI Detector positions itself on responsible AI use and honest reporting of its own limits. The two points below explain the standard the detector holds and the boundary a user should keep in mind.

Support Responsible AI Use

AI Detector supports responsible AI use, academic integrity, and transparency about AI in writing. The tool exists for detection and disclosure, not evasion, and does not promise to help a user beat another detector. AI Detector treats AI education and honest disclosure as the goal of a scan.

Know The Detector's Limits

AI Detector reports a probability estimate, not a final verdict, because no AI detector reaches 100 percent accuracy. A reviewer should treat the AI score as one input in a wider review. A reviewer should also submit longer text where possible, because a longer sample improves the accuracy of the estimate.

Understand How Detection Works

AI Detector measures the statistical patterns that separate machine writing from human writing, led by perplexity and burstiness. Perplexity measures how predictable each word is; AI-generated text tends toward low perplexity because a language model selects high-probability words. Burstiness measures the variation in sentence length and structure; human writing varies more, while machine writing holds a uniform rhythm. AI Detector also analyzes sentence-structure predictability, repetition and uniformity, word-frequency ratios, parts-of-speech distribution, and syllable dispersion. The detector combines these linguistic-pattern signals through a deep-learning model to produce the AI likelihood estimate.

Start Free, Upgrade Anytime

Guest scans are 500 characters. A free sign-in adds one 1,000-character scan, then the cap returns to 500. Go and Pro use the same signed-in paste ceiling as the other writing tools.

Free

$0 forever

For trying it out and quick cleanups.

Claude Watermark Remover: 15,000 characters with no account, or 25,000 per check after you sign in
ChatGPT Watermark Remover: 15,000 characters with no account, or 25,000 per check after you sign in
AI Text Cleaner: 15,000 characters with no account, or 25,000 per check after you sign in
Deep Humanize: 1,500 characters per day
Runs in your browser — text never leaves your device on the free scan
One language

Start free

$6/month

Billed monthly

For regular cleanups without the Pro cap.

Everything in Free
Claude Watermark Remover: 25,000 characters per check
ChatGPT Watermark Remover: 25,000 characters per check
AI Text Cleaner: 25,000 characters per check
Deep Humanize: 25,000 characters per day
Two-pass paraphrase + humanizer to reduce AI writing signals
Save your history — original and cleaned text

Get Go

Notes From The Bench

“I pasted a 1,200-word draft and the free clean pulled out zero-width characters I had no idea were there. My submission finally read as plain text. If you're writing longer papers, the deep clean on the account plan is worth it, the free 15,000-character limit fills up fast.”

“This fixed a phantom Git diff that was driving me up the wall. Turned out an invisible byte was hiding in a generated SQL insert. Claude Watermark Remover caught it instantly. I upgraded so I could run whole migration files at once, and for anyone shipping AI-generated code, that's the plan to get.”

“I run every AI draft through this before it touches my CMS now. The em dash and smart-quote cleanup alone saved me a ton of manual editing. The free version is great for testing, but once I started publishing daily, the paid deep clean paid for itself in the first week.”

“What sold me was seeing the character stats: original length, cleaned length, exactly what got removed. No guessing. I clean client copy all day, so I moved to the account plan for the higher limits. If editing is your actual job, don't stay on free, the deep clean is a different level.”

“Cleaned a batch of long-form articles and my formatting stopped breaking on publish. Hidden characters were quietly messing with how pages rendered. The free clean handled short posts fine. For full articles I'd genuinely recommend the paid plan, it's built for volume and the deep clean goes way further.”

“The privacy side matters to me. Everything runs in the browser, so my unpublished research never leaves my machine. I tested the free tier for weeks before committing. Once I did, the statistical deep clean was the feature I actually needed, and it's only on the paid side, so upgrade if you're serious.”

“My whole team uses it now. We were manually stripping weird spacing and invisible markers before, and this does it in one click. We went with the paid plan for the character limits and the structural rewrite. If you're running a team or an agency, honestly just start on the paid tier.”

“Simple, fast, and it actually works. It kept my Word and PDF formatting intact while clearing the hidden stuff underneath. The free clean is a solid taste of it. But if you want the full statistical clean and no character ceiling, the paid plan is where this tool really excels.”

Find Answers To Common Questions

AI Detector answers the most common questions about AI detection, accuracy, supported models, false positives, and privacy below. Each answer states the direct response first, then adds the context a reader needs to act on it.

What Is An AI Detector?

An AI detector is a tool that estimates whether text was written by a human or generated by an AI language model. AI Detector reads submitted text and measures statistical patterns such as perplexity and burstiness. The detector returns an AI score from 0 to 100 percent with the specific sentences that read as machine-generated. The score is a probability estimate that supports a human review, not a final verdict on authorship.

How Does AI Detection Work?

AI detection works by measuring statistical patterns in text that differ between human and machine writing. AI Detector analyzes perplexity, which is how predictable each word choice is, and burstiness, which is how much sentence length and structure vary. Machine-generated text tends toward low perplexity and low burstiness because a language model favors high-probability, uniform phrasing. AI Detector combines these signals with parts-of-speech and frequency analysis through a deep-learning model to produce the AI likelihood estimate.

How Accurate Is AI Detector?

AI Detector reports a probability estimate rather than a guaranteed verdict, because no AI detector reaches 100 percent accuracy. Accuracy improves on longer text, because a larger sample gives the detector more statistical signal to measure. A reviewer should read the AI score and the flagged sentences as one input within a wider review, and should confirm a borderline result against the confidence score before acting.

Does AI Detector Detect ChatGPT, Claude, And Gemini?

Yes. AI Detector detects text from ChatGPT, Claude, and Gemini, along with GPT-5, GPT-4, o3, Claude Sonnet, Gemini 2.5, Llama, DeepSeek, Grok, Perplexity AI, Mistral, Copilot, and Jasper. The detector analyzes the statistical patterns shared across large-language-model output, so it flags text from a new model version without a separate update for each model.

Can AI Detector Detect Mixed AI And Human Text?

Yes. AI Detector detects mixed documents that combine human-written and AI-generated passages through line-by-line analysis. The detector distinguishes fully AI-written text from human-written text and from AI-refined text, then flags only the partial-AI passages rather than labeling the whole document. This handles the common case where a writer drafts with a person and edits with a language model, or the reverse.

Does AI Detector Flag Human Writing As AI?

A false positive is possible with any AI detector, and AI Detector reduces the risk through a low false-positive rate and ESL de-biasing. The detector accounts for the simpler structures and repeated phrasing common in second-language writing, which older detectors often misread as machine-generated. A reviewer should treat a single flag as one signal, check the confidence score, and read the flagged sentence in context before drawing a conclusion.

Is Using AI To Write Considered Cheating?

Using AI to write is not automatically cheating, and the answer depends on the disclosure rules of the school, publisher, or employer that receives the work. AI Detector supports responsible AI use and honest disclosure rather than evasion, so the tool helps a writer identify AI-generated passages and decide whether to disclose or revise them. A user should follow the specific integrity policy that governs the document.

How Do I Fix Flagged Text?

To fix flagged text, open the flagged sentence, use the one-click in-line rewrite, and re-scan the revised text to confirm a lower AI score. AI Detector paraphrases the flagged passage, adds a natural personal voice, and removes repetitive AI patterns while preserving the original meaning. A writer repeats the rewrite-and-rescan step until the AI score reaches an acceptable level.

Which Languages Does AI Detector Support?

AI Detector supports six languages for detection: English, Spanish, French, German, Portuguese, and Italian. The detector applies the same sentence-level scoring and highlighting in each supported language, so a reviewer checks non-English content without switching tools.

Is My Text Private?

Yes. AI Detector keeps submitted text private through a privacy-first design that secures content during and after a scan. The detector does not publish or expose the text a user submits, so unpublished drafts, research, and confidential business documents remain protected. Data protection applies to every scan by default.

AI Detector connects to four related writing tools that extend the detect-and-fix workflow. These tools cover humanizing, paraphrasing, watermark removal, and originality checks.

Claude Watermark Remover

Strip hidden characters from Claude output in the browser.

ChatGPT Watermark Remover & Detector

Strip hidden Unicode and punctuation tells from ChatGPT text.

AI Text Cleaner

Clean hidden characters, spacing, and AI formatting in one pass.

Humanize AI

Rewrite AI-like drafts so they read closer to natural writing.

Detect AI Now

AI Detector detects AI-generated text, shows every flagged sentence with an explainer card, and rewrites those sentences in place, all within one free tool at claude-watermarkremover.com. The detector identifies output from every major large language model, including ChatGPT, Claude, and Gemini. AI Detector measures statistical patterns such as perplexity and burstiness through a deep-learning model, then returns an AI score from 0 to 100 percent. The detector reports a probability rather than a verdict, reduces false positives for second-language writers, and keeps submitted text private. This combination makes AI Detector a reliable first step for confirming and fixing AI content in essays, articles, reports, and marketing copy.

Detect AI in your text