PlagiarismCheck.org
Plagiarism checker and AI content detector for schools, universities, businesses and individual writers.
PlagiarismCheck.org is an online plagiarism checker with an AI content detector. PlagiarismCheck.org compares a submitted text against web sources and its databases, reports a similarity percentage with links to matching sources, and flags text that is likely AI-generated. It is used by schools, universities, businesses and individual writers, and connects to learning management systems such as Canvas and Moodle.
Best for Educators and institutions that need originality and AI-writing checks inside their existing learning management system, and writers who want to check a draft before submitting.
- Platforms
- Web, API, Browser extension, Plugin
- Free trial
- Yes
- API
- Yes
- Made by
- PlagiarismCheck.org
- Added
Last verified: . Information taken from plagiarismcheck.org.
What is PlagiarismCheck.org?
PlagiarismCheck.org is a web-based originality checker that has operated since 2015. It scans a document for matches against online sources and its own databases, then returns a report with a similarity percentage, highlighted passages and links to the originals. Beyond exact copies it looks for reordered sentences, synonym swaps, switches between active and passive voice, and character tricks such as Cyrillic letters standing in for Latin ones. A separate detector, TraceGPT, estimates whether text was produced by an AI model, and the Fingerprint feature compares a paper with a student's earlier writing to check authorship. The service integrates with Canvas, Moodle, Google Classroom, Schoology, Brightspace, Blackboard and Populi, and offers a Google Docs add-on, a Chrome extension and an API. A grammar checker and a citation generator are also included.
Key Features
Similarity Report
Shows the share of matching text, marks the affected passages and links each one to the source it resembles.
AI Content Detection
Assesses whether a passage reads as machine-written, including output from ChatGPT.
Disguise Detection
Catches paraphrase-style edits such as word substitution, changed sentence order and hidden or look-alike characters.
Fingerprint Authorship Check
Compares a new submission with the same student's previous work to spot writing by someone else.
LMS Integrations
Runs inside Canvas, Moodle, Google Classroom, Blackboard, Brightspace, Schoology and Populi.
Writing Tools
Adds a grammar checker, citation generator, essay grader and topic generator for individual users.
Use Cases
- Grading a Batch of Essays
- Upload many student papers together and review the similarity scores in one pass.
- Checking a Draft Before Submission
- Students scan their own essay or thesis to find passages that need citing or rewriting.
- Detecting Peer Copying
- Institutions add their own archive of documents so new submissions are compared against earlier ones.
- Verifying Freelance Content
- Businesses and editors confirm that commissioned articles are original before publishing.
- Screening for AI-Written Work
- Teachers check whether an assignment appears to have been generated by a language model.
Things to know
- Quotations are treated separately
- By default the checker does not count references and properly marked citations toward the similarity figure.
- Institutional plans are quote-based
- Organisations choose between Advanced and Pro tiers and request a price; features can be adjusted per account.
- Private archives are supported
- Institutions can upload their own texts so that submissions are compared with material not available online.
FAQs
What is PlagiarismCheck.org?
PlagiarismCheck.org is an online service that checks text for plagiarism and for signs of AI generation, and produces a report with a similarity percentage and source links.
What is PlagiarismCheck.org used for?
PlagiarismCheck.org is used by teachers, schools, universities, businesses, students and writers to assess whether a piece of writing is original.
Is PlagiarismCheck.org free?
PlagiarismCheck.org lets individuals check two pages at no charge. Beyond that it is a paid service, and plans for organisations are provided by quote.
Does PlagiarismCheck.org detect AI-written text?
Yes. PlagiarismCheck.org includes an AI detector, branded TraceGPT, that labels content it considers likely to be AI-generated.
Which learning platforms does PlagiarismCheck.org integrate with?
PlagiarismCheck.org integrates with Canvas, Moodle, Google Classroom, Schoology, Brightspace, Blackboard and Populi, and also has a Google Docs add-on.
Does PlagiarismCheck.org have an API?
Yes. PlagiarismCheck.org lists a plagiarism check API along with integration documentation.
What interface languages does PlagiarismCheck.org offer?
PlagiarismCheck.org's institutional plan table lists English, German, French, Portuguese and Spanish as interface languages.
How much does PlagiarismCheck.org cost for schools?
PlagiarismCheck.org does not publish institutional prices. Its Advanced and Pro plans for K-12 and higher education are sold through a quote request.
Who it's for
- Teachers
- Universities
- K-12 schools
- Students
- Writers
- Content teams
Used in these workflows
- AI tools for writing a research paper without handing over the thinkingStage 7: Citations and originality check
Each guide lists the stages of one job and the tools that help at each stage. All guides
Comments
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Listed in the same categories as PlagiarismCheck.org. A starting price appears only where we checked it on the maker’s pricing page; a dash means not checked or not published. All AI Content Detection tools