AI Content Detector
Paste a piece of writing and get an instant, pattern-based estimate of whether it was written by a human or generated by AI. No login needed for the basic analysis.
Last updated: 2026-08-11 · Privacy
What is an AI content detector?
AI detectors look for statistical patterns common in machine-generated text — uniform sentence length, predictable transitions, low lexical variety, and over-typical phrasing. They return a probability score, not a verdict.
CopyCheck Online pairs the pattern analysis with our originality engine, so you can see both "how AI-like" and "how original" a text is in one place.
By the numbers
- 1Pattern analysis covers sentence-length variance, lexical diversity, and transition predictability.
- 2Works on Chinese and English text.
- 3Free basic analysis — no login required.
- 4Pairs with plagiarism results: AI-like AND duplicated is a strong signal.
- 5Best practice: always verify a flag with human reading — detectors are estimates.
AI detection vs plagiarism checking
| AI Detector | Plagiarism Checker | |
|---|---|---|
| What it finds | Machine-generated style | Copied text |
| Method | Statistical patterns | Shingle matching |
| Output | AI-probability score | Similarity % |
| Confidence | Estimate — verify | Direct evidence |
How to use
- 1Paste text
Paste the passage to analyze (up to 10,000 chars).
- 2Run analysis
The pattern engine scores AI-likeness in seconds.
- 3Cross-check originality
Run the same text through the plagiarism check to see source matches.
Sample signals
In today’s fast-paced digital landscape, organizations must leverage cutting-edge solutions to optimize their operational efficiency and maximize stakeholder value.
AI-likeness: 78% (High) · Uniform sentence length — likely machine-generated · Generic business phrasing ("leverage", "cutting-edge")
FAQ
Is AI detection 100% accurate?
No. No AI detector is. Scores are statistical estimates; always confirm with human review, especially for borderline cases.
Does it work for translated or mixed text?
Chinese and English are supported; highly edited or translated AI text is harder to detect.
Is my text saved?
Basic analysis runs locally. No raw text is stored on our servers.
Sources
- · Method: statistical pattern analysis (sentence-length variance, lexical diversity, transition entropy)
- · Best-practice guidance: OpenAI & academic literature on AI-text detection limitations