Plagiarism Copy Checker
Powered by 9Rank AI Engine · 100B+ pages indexed · Instant results · Free starter credits included
Copy Checker
AI Deep Scan100B+ pages indexed · Exact match + paraphrase · PDF report
Why 9Rank Copy Checker?
Built primarily for SEO professionals, content creators and publishers who demand the deepest source coverage — and trusted equally by students and educators who need accuracy they can cite.
9Rank AI Engine
Proprietary deep-scan technology cross-referencing 100B+ web pages — including niche domains, paywalled content and international sources other tools simply miss.
SEO Content Shield
Protect your rankings before you publish. Detect thin, duplicated or scraped content that Google penalises — and fix it before it costs you traffic.
Widest Source Coverage
Blogs, news outlets, academic databases, social media and competitor sites — we cover more ground than Grammarly, Turnitin or any standalone checker.
One-Click. Instant Report
Paste, import from URL or upload a file. Hit Check — and get a full highlighted report with inline source links, similarity score and downloadable PDF in seconds.
Who is it for?
9Rank Copy Checker is designed around the needs of modern content professionals — with full support for academic and educational use cases.
Verify every article before publishing. Keep your brand voice original and protect your authority with unique content.
Audit client content, catch duplicate pages, and ensure every asset passes Google's originality thresholds.
Deliver 100% original copy to clients with proof. Eliminate accidental rewording matches and protect your reputation.
Detect content scrapers copying your IP. Monitor your original work across the entire web in one click.
Check essays, theses and research papers for unintentional matches before submission. Academic integrity, guaranteed.
Screen submitted work efficiently. Eliminate manual checks and provide clear evidence of plagiarism with source citations.
What Makes 9Rank Different
Built from the ground up for SEO professionals and content teams — with capabilities that most standalone plagiarism tools simply don’t offer.
Deepest Source Coverage
Our index spans 100B+ web pages including niche blogs, international sites, paywalled academic content, and social media — sources most checkers never reach.
SEO Content Shield
Goes beyond plagiarism detection. Flags thin content, near-duplicate pages and scraped rewrites that trigger Google penalties — before you publish and lose rankings.
URL & File Import
Check any publicly accessible URL directly — no copy-pasting required. Upload PDF or DOCX files and scan instantly. Most checkers only accept plain text.
Interactive Source Matching
Plagiarized segments are highlighted directly in your document with clickable source chips. Navigate match by match, expand sources, and see percentage similarities — live.
PDF Report + Re-check Caching
Download a branded, shareable PDF report for any scan. Re-check the same document within 24 hours for free — results are cached so you never pay twice for the same content.
Full SEO Platform Bundled
Every credit plan includes access to the entire 9Rank suite — keyword research, rank tracking, site audits, SERP analysis and more. No plagiarism-only subscription silo.
Bulk Upload & Queue
Upload up to 100 files or paste multiple URLs in one session. The queue engine processes each document and delivers all reports in a single unified view — built for agencies.
AI Content Detection
Detect AI-generated text from ChatGPT, Claude, Gemini and other models — built into the same scan. No separate subscription or tool switching required.
Pay-as-You-Go Credits
A per-document credit model means you only pay for what you actually check. Free starter credits included — no credit card required to see your first result.
Built for the Next 3 Years of Content
As AI content floods the web and Google's algorithms evolve, 9Rank is already building the next generation of originality tools.
AI-Powered Rewrite Suggestions
When plagiarism is detected, the 9Rank AI Engine will suggest specific rewrites for flagged passages — so you can fix and re-check in a single workflow without leaving the page.
Brand Voice Consistency Check
Beyond plagiarism — verify that content matches your brand's established tone, vocabulary and style guide. Critical as AI-generated content scales across large teams.
SERP Impact Prediction
Before publishing, see a predictive score for how originality and duplicate-content signals will affect your target keyword rankings — powered by 9Rank’s live SERP intelligence.
Frequently asked questions
Have a different question and can’t find the answer you’re looking for? Reach out to our support team.