DupliChecker
DupliChecker is a web-based plagiarism checker that scans pasted text or uploaded documents against online sources and returns a similarity percentage. It also carries a reverse image search, a paraphrasing tool and a grammar check.
#32 in Writing & Translation ToolsPlagiarism CheckersFree plan
Who it's for
Best for
Students who want a free similarity scan of essays before submitting
Teachers screening class papers for copied passages
Not for
Photographers tracing where an image was reposted online
Subscribers who want to cancel a paid plan from the dashboard
Features
Upload in seven file formats
Text can be pasted into the box or uploaded from a device or cloud storage as .tex, .txt, .doc, .docx, .odt, .pdf or .rtf files.
Similarity shown as a percentage
Each check reports the unique content ratio as a percentage and clarifies the matching resources in numbers next to the scanned text.
Normal and premium scan modes
Normal Scan runs for free, while Deep Scan, Academic Scan, AI Detection and Fingerprint sit in the premium plan with quote and bibliography exclusion.
Checking in seven languages
The checker detects plagiarism in Spanish, Russian, Portuguese, Dutch, Indonesian, Italian and Arabic in addition to English.
Content discarded after a check
Uploaded material is not saved; the site states that content is trashed after a plagiarism check to guard against data leakage.
What users say
Pros
- Reverse image search returns image matches for pictures that TinEye, Google and Yandex miss.
- Cancellation requests sent by email get a responsive reply and the plan is stopped.
Cons
- Reverse image search shows a match for pictures that were never published anywhere online.
- The matching source disappears from the results once a paid plan is active.
- Image-match sources are locked behind a paid plan and withheld until payment.
- Cancellation has to be requested by email because the account dashboard has no cancel button.
- Weekly payments kept coming out even after cancellation was attempted.
- Payment goes through for the wrong tool, then the correct one asks for another charge.
A selection of the review sources we used:
Summarized from public user reviews and community discussions. View details
Global Traffic Rank
Top 10k
Alternatives
Rank#32 in category#5 in category#12 in category#14 in category
Free planYesYesYesYes
ProFinds image matches TinEye misses, cancellation emails answeredCatches small slips, safety net for English phrasingCatches edited AI text and shows a human, mixed, AI splitStanding daily workhorse for academic editing
Better forReal-time grammar, spelling, and tone corrections across browser extensions and desktop apps.Detailed AI detection with sentence-by-sentence highlights and invented citation checks.
Weaker atScanning text for plagiarism on a free tier, which requires a paid subscription.Reverse image searching, as checks are limited to written text.