PlagiarismCheck.org
PlagiarismCheck.org is an online checker that scans text for copied passages and AI-generated content against web and database sources. It is mainly used to review essays, assignments and outsourced articles before submission or publication.
#17 in Writing & Translation ToolsPlagiarism CheckersAI DetectorsFree plan
Who it's for
Best for
Teachers and hiring managers screening submissions for copied passages
Content teams vetting articles from outside contributors before they publish
Not for
Writers who need certainty that every copied passage is caught before publishing
Features
Plagiarism and AI in one scan
A single submission is checked against databases and the open web for similar text, with AI-generated content flagged alongside the matches.
Interactive similarity results
Matched sources are listed with the overlapping fragments, including word substitutions and rearranged sentences, so each result can be opened and compared.
Downloadable reports
Completed checks can be downloaded as documents for filing, sharing with a class, or keeping as a record of a submission review.
Classroom platform integrations
The checker connects with Moodle, Google Classroom, Canvas and Blackboard so checks run inside the tools a course already uses.
Two free pages to start
Two pages of text can be checked without payment, and documents can be pasted or uploaded directly on the site.
What users say
Pros
- Flags copied or heavily reworked passages in candidate case studies early, ahead of a full review.
- Similarity reports highlight matching text concisely without overwhelming detail, cutting down manual review time.
- Uploaded articles produce separate, quick reports that translate directly into actionable revision feedback.
- Flags machine-written text in submissions that return zero similarity matches.
Cons
- Ten submitted texts came back with no matches; a second checker found 63% copied in one of them.
A selection of the review sources we used:
Summarized from public user reviews and community discussions. View details
Global Traffic Rank
Top 500k
Alternatives
Rank#17 in category#12 in category#18 in category#28 in category
Free planYesYesYesYes
ProEarly red flags, clear reports, per-article checks, AI detectionCatches edited AI text and shows a human, mixed, AI splitHandy citation tool, explained proofreading, solid checksCatches AI text and shows which parts look generated
Better forFlagging fabricated academic citations and unsupported references.