Is CopyCheck Online really free?

Yes. The Free Check uses local corpus + UAPI web search, no login needed. 3 free searches per day for guests, 10 per day when logged in.

How does the Web Check differ from Free Check?

Web Check (paid, Tavily-powered) crawls full web pages and provides deeper source matching. The Free Check is fast and great for most cases.

Can AI rewrite my plagiarized parts?

Yes. Click "AI Rewrite" after a check for line-by-line fixes plus a fully rewritten version (powered by DeepSeek).

Is my text stored anywhere?

No. Only check summaries and source matches are saved for your history. Raw text is never uploaded, trained on, or shared with third parties.

Which languages are supported?

Mixed Chinese/English text detection. UI in English and Chinese, switchable on the fly.

How accurate is the check?

Free Check uses shingle fingerprinting plus live web search. Web Check goes further with full-page extraction.

CopyCheck Online - Plagiarism & Originality Checker

1. Service

CopyCheck Online (copycheck.online) is a browser- and cloud-based content originality / similarity detection service. It includes free local checks, paid deep web queries, AI rewrite suggestions, and a lossless image compressor.

2. Eligibility

You must be at least 18 years old (or the legal age in your jurisdiction) and have full civil capacity to use paid features.

3. Account & Security

You sign in with Google. Sessions are kept via the cc_session cookie. Do not share access.
Email [email protected] immediately if you detect suspicious activity.

4. Acceptable Use

You agree not to abuse the service, including but not limited to scripted bulk calls, bypassing rate limits, distributing malicious content, or infringing others' intellectual property. Violations may lead to account suspension.

5. Credits & Billing

Free check (local + UAPI search boost): 3/day for guests, 10/day for signed-in users.
Web deep-check is billed per check (1–20 credits) by non-whitespace character count.
AI rewrite costs 3× the check price (minimum 3 credits).
Virtual credits are non-refundable once consumed. If you have not used any credits within 7 days of purchase, you may request a refund (except where prohibited by law).

6. Intellectual Property

You retain full ownership of the text you submit. We process it only to deliver the requested service. We do not use it for training or sell it to third parties. CopyCheck Online's code, design, and copy are owned by us.

7. Disclaimer

Results are generated by algorithms and are not guaranteed to be 100% accurate. For academic submissions, rely on Turnitin / iThenticate / Wanfang. For legal or commercial use, please verify manually. We disclaim liability for outcomes based on automated results.

8. Changes & Termination

We may modify or discontinue any feature at any time. Material changes will be announced on-site at least 7 days in advance. Remaining credits may be refundable within 90 days after service termination.

9. Governing Law

These terms are governed by the laws of the operator's jurisdiction. Disputes are resolved amicably first.

10. Contact

Support: [email protected]

Terms of Service