99%
Detection accuracy
Measured on diverse datasets of AI-generated versus human writing, and retested as new models ship.
AI Detector for ChatGPT, GPT-5, Claude and Gemini
Check whether text was written by AI. Paste text or upload a file for a free AI score, no signup required.
Text to checkBest results in English
15,000 free · 160,000 with a planAdd text to start your scan
Paste from your clipboard, upload TXT, PDF or DOCX, or just start typing.
Need an example?
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- Full-text highlights
- No account needed
- A signal, not proof
From text to evidence
How the AI detector works
See where a signal came from instead of relying on one dramatic percentage.
- 1
Add a meaningful sample
Paste your text, upload a TXT, PDF or DOCX file, or start with a local example.
- 2
Run the detector
The analysis begins only after you choose Scan for AI. Nothing is sent while you type.
- 3
Review highlighted results
Start with the overall AI score, then read AI-like passages highlighted in the full text.
Accuracy
99% accurate, with under 1% false positives
The engine behind detecting-ai.com pairs a feature-based classifier with a fine-tuned transformer and calibrates the two into one score. Both error directions are measured: how much AI-generated text gets caught, and how often human writing is wrongly flagged. When the call is close, the report shows the sentences so you can check the verdict yourself.
<1%
False positive rate
Calibrated confidence scoring, de-biased for second-language English writers, keeps wrong flags on human work rare.
1B+
Texts tested
The detection engine has been exercised on more than a billion human-written and AI-generated samples.
Method
The document score is only the beginning.
Structure is preserved, eligible text is divided into sentences, and each sentence is scored independently for signs of AI-generated text. The document signal is the average of those analyzed scores.
- 01
Inspect the distribution
A high document signal can contain low-signal passages, and a low document signal can still contain sections worth reviewing.
- 02
Keep uncertainty visible
Short, translated, heavily edited or formulaic writing can be harder to classify. Scores may change as the text changes.
- 03
Use human context
A model score cannot establish authorship, intent or misconduct. Treat it as one input alongside drafts, sources and conversation.
Coverage
Detects GPT-5, Claude, Gemini and mixed drafts
Model names describe the text families this AI content detector is designed to review, not partnerships or guaranteed source attribution.
| Text family | Designed to review | Result |
|---|---|---|
| OpenAI | ChatGPT output from GPT-5, GPT-4o and earlier GPT models | AI score + highlighted text |
| Anthropic | Claude model family | AI score + highlighted text |
| Gemini model family | AI score + highlighted text | |
| Mixed drafts | Human-edited and AI-assisted writing | Different signals highlighted in context |
Use cases
Who uses an AI checker
Anyone reviewing writing they did not watch being written. The common thread is care: the score opens a conversation instead of ending one.
Education
Identify passages worth discussing while keeping drafts, sources and student context in the decision.
Editorial review
Triage contributed drafts and focus attention where the writing pattern changes sentence by sentence.
Publishing
Add a measured authorship signal to an existing review workflow without treating it as proof.
Personal writing
See how revisions change the signal before sharing work with a client, teacher or editor.
Developers
The same AI detection, over an API
Everything the workbench does is available programmatically. Score documents from your own pipeline with the AI detector API, or connect the MCP server so your agents can check text for AI patterns mid-conversation.
Before you trust a score
AI detector questions, answered
Straight answers about what an AI detector can and cannot do. Knowing the difference is what makes a score worth using.
How does the AI detector work?
The detecting-ai.com model preserves the document structure, separates eligible text into sentences, scores those sentences independently, and averages their scores into the document signal shown in the report.
How accurate is the AI detector?
The model detects AI-generated text with 99% accuracy across diverse datasets and keeps the false positive rate under 1%. Long, unedited samples are the easiest case; short or heavily edited passages carry more uncertainty, which is why every result also highlights the exact sentences behind the score.
Why was my own writing flagged as AI?
It happens, and it does not mean you did anything wrong. Formulaic structure, stock phrasing and very uniform sentence rhythm can resemble model output, especially in short samples. Open the highlights, revise the sentences that read like boilerplate, and scan again. The detector responds to the writing, not the writer.
Can a detector prove who wrote a document?
No. AI detection is a probabilistic review signal, not proof of authorship or misconduct. Consider drafts, citations, writing history and the surrounding context before making a decision.
What makes a useful sample?
Longer, coherent samples generally give the detector more useful context than isolated sentences. Short or heavily edited passages can carry more uncertainty.
What files can I upload?
You can upload TXT, PDF and DOCX files. PDF and DOCX text is read privately in your browser only after you choose a file, so document parsers do not slow the initial page load. Scanned PDFs need OCR and are not supported yet.
Which AI models can it check?
The detector is designed to review patterns commonly found in text from GPT, Claude and Gemini model families, including edited or mixed drafts. It does not identify a specific generator with certainty.
Which languages does it support?
English gives the most reliable results, and the free workbench is tuned for it. The underlying engine is trained across many languages, so text in other languages returns a score too, with accuracy strongest in English.
Why might a score change after a small edit?
Every scan evaluates the current sentence wording and boundaries. Changes to rhythm, phrasing, punctuation or structure can affect individual signals and the document average.
What is the best AI detector?
Judge any detector on three things: how it treats human writing that merely looks formulaic, whether it shows sentence-level evidence instead of only a percentage, and whether it keeps uncertainty visible. detecting-ai.com is built around all three. No signup is required, and every score comes with the highlighted sentences that produced it, so you can judge the verdict instead of trusting it.
Free text check
Start with the sentences, not a verdict.
Try the detectorFree scans need no account. If a flagged draft needs work, you can humanize AI text and review every edit before it ships.