Free Turnitin Check
Plagiarism & AI Detection
OriginCheckAI is an online plagiarism detection service that runs your document through the official Turnitin system and returns a detailed similarity report plus AI writing detection — delivered in approximately 3 minutes. Over 1 million students at 500+ universities rely on OriginCheckAI to verify academic integrity before submission.
Free Estimate vs Full Report
See exactly what you get with our official Turnitin reports
| Feature | Free Tools | Full Report ¥15 |
|---|---|---|
| AI Detection | Estimated | Real Turnitin |
| Similarity Check | Limited | Full Analysis |
| Source Matching | Detailed Sources | |
| PDF Report | Official Format | |
| No Repository (Zero Trace) | May Store | Safe to Submit |
| Credits Validity | — | Never Expire |
Why Choose Us?
Professional technology and reliable service for your academic journey
Official Turnitin API
Direct integration with Turnitin official system. Results identical to university reports.
3-Minute Reports
Ultra-fast processing. Most documents complete within 3 minutes with full detailed reports.
AI Detection
Detect ChatGPT, GPTZero, ZeroGPT and other AI-generated content with high accuracy.
Privacy Protected
Documents are never stored in any database. Auto-deleted within 24 hours for complete safety.
Multiple Formats
Support PDF, DOC, DOCX and more. Up to 50MB file size with no page limits.
24/7 Support
Round-the-clock customer support via WeChat. Get help whenever you need it.
AI-Powered Writing Assistant
Professional tools to improve your writing quality and originality
AI Humanizer
Transform AI-generated text into natural human writing. Bypass AI detection while preserving meaning.
- 99% AI Detection Bypass
- Preserve Original Meaning
- Multiple Language Support
Grammar Check
Intelligent grammar and spelling checker. Detect and fix errors with 99.5% accuracy across 50+ languages.
- Grammar & Spelling Fix
- Real-time Highlighting
- 5000 Words Free Daily
Smart Paraphrase
Rewrite text with different expressions while keeping the original meaning. Reduce similarity score effectively.
- Multiple Rewrite Modes
- Reduce Similarity Score
- Academic Style Options
Three Simple Steps
Get your professional plagiarism report in minutes
Register & Login
Create account with email. Bind activation code to start. Get free checks through referral program.
Upload Document
Upload your PDF, DOC or DOCX file. Support up to 50MB with drag & drop.
Get Report
Receive detailed similarity and AI detection report within 3 minutes. Download anytime.
Invite Friends, Get Free Checks
Share your referral link. For every 5 friends who register and bind activation code, get 1 free plagiarism check + AI detection!
- Unlimited referral rewards
- Track invites in real-time
- Rewards never expire
Referral Reward Rule
Invite 5 friends to register & bind code
= 1 FREE Check + AI Detection
Partnership Opportunities
Flexible agent and supplier cooperation models for long-term business growth.
Common Questions About Plagiarism Checking
Everything you need to know before checking your paper
Are the results the same as my university's Turnitin?+
Yes. OriginCheckAI uses the official Turnitin API, so the similarity score and AI detection results are identical to university systems. You receive the same PDF report format your professor sees.
How long does plagiarism checking take?+
Most documents complete detection within 3 minutes. Complex documents with over 10,000 words may take 5–10 minutes. You will receive both a similarity report and an AI detection report.
Will my paper be stored in the Turnitin database?+
No. OriginCheckAI operates in "No Repository" mode, meaning your document is never added to any database. All uploaded files are automatically deleted within 24 hours, so it is safe to check before submitting to your university.
What is the difference between the free estimate and the full report?+
The free estimate provides an approximate similarity percentage using basic algorithms. The full report (¥15 per check) runs your document through the official Turnitin system and returns a detailed PDF with source matching, AI detection score, and highlighted passages — identical to what universities use.
Can OriginCheckAI detect AI-generated content from ChatGPT?+
Yes. The full Turnitin report includes AI writing detection that identifies content generated by ChatGPT, GPT-4, Claude, Gemini, and other large language models. The AI detection score shows what percentage of your text appears to be AI-generated.
What file formats are supported?+
OriginCheckAI supports PDF, DOC, DOCX, TXT, and RTF files. The maximum file size is 50 MB with no page limits. Most academic papers, essays, and theses are fully supported.
Choose Your Plan
Multiple purchase channels for your convenience
Online Shop
Buy check credits and AI humanizer quota directly. Instant delivery, auto-credited to account.
Visit ShopWeChat Service
Contact customer service via WeChat for personalized assistance and bulk purchase discounts.
Ready to Start?
Join 1 million+ students who trust our plagiarism check service. Get your first report in minutes.
Start Free Check