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.

CCCopyCheck Online

Writing Tools ← Back to home

CopyCheck Online vs Turnitin

Turnitin is the institutional standard for plagiarism detection. CopyCheck Online is a free, private pre-submission tool for students. Here’s how they work together.

StudentsAcademia

Last updated: 2026-08-11 · Privacy

Different tools for different moments

Turnitin is run by institutions: submitted papers are checked against a huge database and stored. Students usually cannot run checks themselves, and results can affect grades.

CopyCheck Online is the pre-submission safety net: check your draft privately (no upload, no storage), fix flagged passages with AI rewrite, then submit with confidence.

By the numbers

1CopyCheck free tier: 20 local + 3 web checks/mo.
2CopyCheck local checks never upload your paper.
3CopyCheck AI rewrite included.
4Turnitin is institution-provided (not sold to students directly).
5Turnitin compares against its proprietary repository; CopyCheck scans the open web.

Side-by-side

	CopyCheck Online	Turnitin
Who uses it	Students (pre-check)	Institutions
When	Before submission	After submission
Free for students	Yes (free tier)	No (school pays)
Text privacy	Local, not stored	Stored in database
AI rewrite	Yes	No

Use both the right way

1
Pre-check with CopyCheck
Catch overlaps privately before submission.
2
Fix flagged passages
Paraphrase with AI rewrite, re-check until clean.
3
Submit to Turnitin
Institutional check should now come back clean.

Workflow example

Input

Draft essay (2,000 words) → CopyCheck pre-check → fix 3 overlaps → resubmit to Turnitin.

Output

Pre-check: 3 overlaps found (18% similarity) After AI rewrite: 0 overlaps (2%) Turnitin result: within acceptable range ✓

FAQ

Is this a Turnitin replacement?

No. Use CopyCheck as a private pre-check; Turnitin remains the official institutional check.

Can my school see my CopyCheck history?

No. Local checks stay on your device; logged-in history is private to you.

Does Turnitin detect text checked on CopyCheck?

No — local checks add nothing to any database.

Sources

· Public knowledge of institutional plagiarism tools and CopyCheck’s published features (2026-08).

More free tools

Checker for StudentsPre-submission tool Plagiarism CheckerTry it now Paraphrasing ToolFix flagged passages