Plagiarism Detector runs entirely on your Windows desktop. Unlike online plagiarism checkers, your documents are never uploaded to external servers. Text excerpts are sent only to search engines during Internet checks — the same way you would search manually — and no full documents are ever stored in the cloud.
The installer is digitally signed and regularly scanned by VirusTotal. No registration is required, no personal data is collected, and no account is needed to use the software.
The free demo of Plagiarism Detector gives you access to all core features so you can evaluate the software before purchasing a license. Test Internet plagiarism checking against five search engines — Google, Bing, Yahoo, DuckDuckGo, and the ScIPaP academic paper database. Try Document Pair Comparison to check two files against each other completely offline. Run the built-in AI Content Detector to identify text generated by ChatGPT, GPT-4, Claude, and other large language models.
The demo uses the same detection algorithms as the full version, including the UACE Anti-Cheating Engine that catches Unicode character substitution tricks. However, the demo has several limitations: only the first 700 words of each document are analyzed, one document can be checked per session, originality reports show partial URLs and include a "Demo" note, resource processing is incomplete, and you are limited to 10 checks total. This is enough to thoroughly evaluate the software with your actual documents before purchasing a license.
No registration, no email address, and no credit card required. Download, install, and start checking your documents immediately.
| Feature | Free Demo | Lite | Personal | Pro | Portable |
|---|---|---|---|---|---|
| Internet Check | ![]() |
![]() |
![]() |
![]() |
![]() |
| PDF support | ![]() |
![]() |
![]() |
![]() |
![]() |
| Compare 2 Documents | ![]() |
![]() |
![]() |
![]() |
![]() |
| PDAS connectivity | ![]() |
![]() |
![]() |
![]() |
![]() |
| Report PDF-Export | ![]() |
![]() |
![]() |
![]() |
![]() |
| USB Drive License | ![]() |
![]() |
![]() |
![]() |
![]() |
| Analysis Depth | First 700 words | Full document | |||
| Documents per Session | 1 | Unlimited | |||
| Originality Report | Partial URLs, "Demo" note | Full source URLs, no watermark | |||
| Resource Processing | Incomplete | Complete | |||
| Monthly Document Quota | 10 checks total | 100 documents/month | |||
Download the installer using the link above. The file is digitally signed and verified clean by VirusTotal.
Run the installer and follow the setup wizard. Installation takes less than a minute and requires no special configuration.
Launch Plagiarism Detector, open any document (DOC, DOCX, PDF, TXT, or 8+ other formats), and click Check. Your first originality report will be ready in minutes.