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Plagium

plagium.com

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Spec score 9.0 #5 of 26 in AI Plagiarism Checkers

What it is

Plagium analyzes text for similarity with other material and offers a separate tool for identifying patterns compatible with AI-generated writing. Its plagiarism service compares submitted text with an online database and reports similarities with links to original sources. The AI Detector uses statistical and probabilistic analysis of writing patterns. Deep Search accepts Microsoft Word, PDF, and native text files; Google Drive integration and a Google Docs add-on support document analysis. Institutional users can access an API, while business solutions can integrate with corporate CRM, ERP, and document-management systems. Plagium presents solutions for educational institutions, publishers, editors, companies, researchers, and compliance teams. The free account costs nothing and allows five daily searches with a 4,000-character limit, but excludes Deep Search and API access. Plagium says submitted content remains owned by the user and is processed for analysis, report generation, and service improvement. Reports are automated estimates rather than definitive proof, and private, unpublished, or non-indexed material may not be detected.

Spec sheet

What it does
Plagium compares submitted writing with online material to identify possible plagiarism and separately estimates whether text appears machine generated.Read 15 Oct 2026 · plagium.com
API
The institutional tier includes API access, and Plagium publishes API v3 and API v2 documentation.Read 30 Sep 2026 · community.plagium.com
Integrations
Plagium lists Google Drive integration and a Google Docs Add-on for analyzing documents.Read 30 Sep 2026 · plagium.com
Support
Published support channels include a help center, email or help-desk support, FAQs/forum and priority email on paid tiers.Read 15 Oct 2026 · plagium.com
Headquarters
New York, USA and FranceRead 28 Sep 2026 · plagium.com
Founded
2006Read 28 Sep 2026 · plagium.com
AI detection
Plagium provides a separate AI Detector based on statistical and probabilistic analysis of writing patterns.Read 30 Sep 2026 · plagium.com
AI detector
The AI detector reports a likelihood of machine authorship and highlights mixed documents section by section.Read 15 Oct 2026 · plagium.com
API availability
API access is restricted to the Institutional plan rather than individual free, prepaid or monthly plans.Read 15 Oct 2026 · plagium.com
API endpoints
API v3 documents endpoints support text creation, file upload, document retrieval, result retrieval and remaining-credit checks.Read 15 Oct 2026 · community.plagium.com
API extensibility
API v3 accepts webhooks, metadata and sub-account user IDs, and the documentation includes Node.js examples.Read 15 Oct 2026 · community.plagium.com
Company facts
LinkedIn lists New York headquarters, private ownership, 2–10 employees and a 2006 founding year.Read 15 Oct 2026 · linkedin.com
Company history
Plagium says it was founded in 2006 and that millions of users check documents and academic articles each year.Read 30 Sep 2026 · plagium.com
Company identity
LinkedIn identifies Plagium as a service of Septet Systems Inc.Read 15 Oct 2026 · linkedin.com
Crunchbase profile
Crunchbase lists Plagium as a private, for-profit New York company with 1–10 employees and no disclosed founding year.Read 15 Oct 2026 · crunchbase.com
Data retention claim
The About page says documents are processed, deleted on schedule and not added to the comparison index.Read 15 Oct 2026 · plagium.com
Document comparison
Users can compare uploaded files against their own documents through File Search.Read 15 Oct 2026 · plagium.com
Documentation
The knowledge base covers account security, billing, plagiarism reports, AI-detector limitations, API authentication, usage limits, endpoints and webhooks.Read 15 Oct 2026 · community.plagium.com
Enterprise integration
Business solutions integrate with existing corporate systems including CRM, ERP and document-management platforms.Read 30 Sep 2026 · plagium.com
File support
Deep Search supports uploads of Microsoft Word, PDF and native text files.Read 30 Sep 2026 · plagium.com
Google integrations
The service lists Google Drive integration and a Google Docs add-on.Read 15 Oct 2026 · getapp.com
Google Workspace listing
Google Workspace Marketplace lists a free Plagium add-on made by Septet Systems that works with Google Docs.Read 15 Oct 2026 · workspace.google.com
Language coverage
The company says Plagium analyzes more than 40 languages and provides four interface languages.Read 15 Oct 2026 · plagium.com
Licence and ownership
Plagium describes its software, interface and technical structure as property of Plagium or its licensors; no open-source licence is stated.Read 15 Oct 2026 · plagium.com
Limit: detection accuracy
A Trustpilot reviewer estimated plagiarism detection at only 50–60% accuracy and rated the AI detector worse than competitors.Read 15 Oct 2026 · uk.trustpilot.com
Limit: independent test
PlagiarismChecker.net reported unstable behavior, confusing pricing/search choices, no file upload in its test and detection in three of six test documents.Read 15 Oct 2026 · plagiarismchecker.net
Limit: price and highlighting
A Google Workspace reviewer said premium pricing was too high for an AI service and wanted source links to highlight the referenced text.Read 15 Oct 2026 · workspace.google.com
Limit: support and refunds
Another Trustpilot reviewer alleged that a paid month did not work, support messages went unanswered and a requested refund was not provided.Read 15 Oct 2026 · uk.trustpilot.com
Originality certificate
Plagium offers a shareable certificate intended to document that work was checked for originality.Read 15 Oct 2026 · plagium.com
Plagiarism detection
The service compares submitted text with a massive online database and reports similarities with links to original sources.Read 30 Sep 2026 · plagium.com
Plagiarism detector
The plagiarism product searches web, news and academic sources, highlights matching passages and links to sources.Read 15 Oct 2026 · plagium.com
Praise: ease and accuracy
The sole Capterra reviewer praised ease of use, broad source comparison and detection accuracy, reporting no negative experience.Read 15 Oct 2026 · capterra.com
Praise: workflow integration
GetApp describes Plagium as a web checker with Google Docs and Google Drive connections and gives its single reviewer a 5.0 overall score.Read 15 Oct 2026 · getapp.com
Primary function
Plagium performs textual similarity analysis and identifies patterns compatible with AI-generated content by comparing public, private, proprietary and third-party sources.Read 30 Sep 2026 · plagium.com
Privacy compliance
Plagium states that its processing follows applicable Brazilian data-protection law and the EU GDPR where applicable.Read 15 Oct 2026 · plagium.com
Rating on Capterra
5.0 out of 5 from 1 review.Read 15 Oct 2026 · capterra.com
Rating on GetApp
5.0 out of 5 from 1 review.Read 15 Oct 2026 · getapp.com
Rating on Trustpilot
3.3 out of 5 from 2 reviews.Read 15 Oct 2026 · uk.trustpilot.com
Refund limitation
Terms say completed analyses are non-refundable, with exceptions considered only for verified technical failures.Read 15 Oct 2026 · plagium.com
Reports
Reports can include highlighted passages, matched sources, a similarity verdict, PDF export and a read-only share link.Read 15 Oct 2026 · plagium.com
Result limitation
Terms state that plagiarism and AI results are automated estimates rather than definitive proof and may not be accepted by every institution or authority.Read 15 Oct 2026 · plagium.com
Result limitations
Reports are automated estimates rather than definitive proof, and unpublished, private or non-indexed content may not be detected.Read 30 Sep 2026 · plagium.com
Search modes
Quick Search checks the live web rapidly, while Deep Search adds news archives, academic repositories and previously indexed documents, including translated matches.Read 15 Oct 2026 · plagium.com
Security and compliance
Business offerings describe advanced encryption, access control, complete auditing and compliance with corporate regulations.Read 30 Sep 2026 · plagium.com
Submitted-content ownership
Users retain ownership of submitted content, while Plagium receives permission to process it for analysis, reports and service improvement.Read 15 Oct 2026 · plagium.com
Target users
Plagium presents solutions for educational institutions, publishers and editors, companies and corporations, researchers and compliance teams.Read 30 Sep 2026 · plagium.com
User content ownership
Users retain ownership of submitted content, which Plagium processes for analysis, report generation and service improvement.Read 30 Sep 2026 · plagium.com
Workspace permissions
The add-on requests access to installed documents, third-party sidebar content, an external service and basic Google account information.Read 15 Oct 2026 · workspace.google.com

Plans and prices

Free Free 2 searches/day without sign-in · 5/day with account · 2,000 characters per text · summary only · no deep search Read 15 Oct 2026 · plagium.com
Free account Free 5 free daily searches · 4000-character free-search limit · no Deep Search · no API access Read 30 Sep 2026 · plagium.com
Single document $2, paid once one payment From $2 for 1–5 pages · any length with price increasing by pages · plagiarism and AI checks · full report, PDF and share link Read 15 Oct 2026 · plagium.com
Credit packages $7.95, paid once credits never expire From $7.95 · 1 credit per estimated 2,500-character page · quick, deep, AI and file search Read 15 Oct 2026 · plagium.com
Unlimited $19.98 a month billed monthly for selected period; six-month option shown 500 shared checks/calendar month · texts up to 5,000 characters · quick plagiarism and AI checks included · deep search and overage use credits Read 15 Oct 2026 · plagium.com
Institutional $1,200 a year from $1,200/year; invoice available 6,000 shared credits/year · unlimited members · API · LMS integration · member management and reporting Read 15 Oct 2026 · plagium.com
Institutions Priced on request Plagiarism detection · Deep Search · AI Detector · priority support · API access · sub accounts · volume discount Read 30 Sep 2026 · plagium.com
Monthly plan Price not published 10 free daily searches · 4000-character free-search limit · Deep Search · priority support · originality certificate · volume discount Read 30 Sep 2026 · plagium.com
Prepaid plan Price not published 5 free daily searches · 4000-character free-search limit · Deep Search · originality certificate · volume discount Read 30 Sep 2026 · plagium.com

Every Plagium plan and price →

Strong points and limits

Strong points

  • Reports similarities with links to original sources
  • Separate AI Detector analyzes writing patterns
  • Deep Search accepts Word, PDF, and text files
  • Google Drive and Google Docs workflows are listed

Limits

  • Free searches are limited to 4,000 characters
  • Free account excludes Deep Search and API access
  • Private, unpublished, or non-indexed content may go undetected
  • Reports are estimates, not definitive proof

Who it suits

Plagium is aimed at educational institutions, publishers, editors, companies, researchers, and compliance teams checking text. Its free account suits limited searches, while institutional users may need API access or Deep Search.

Plagium in depth

Read the full write-up

Plagium is a web, Android and iOS service for checking textual similarity and screening writing for patterns associated with AI generation. It is most useful to educators, editors, researchers and organizations that need both checks in one workflow. Choose it when source links, document integrations and institutional controls matter more than a conclusive verdict.

Overview

Founded in 2006 with headquarters in New York and France, Plagium compares submitted text with public, private, proprietary and third-party sources. Its plagiarism service searches a large online database, identifies similar passages and links to potential originals. A separate AI Detector applies statistical and probabilistic analysis to writing patterns rather than treating AI authorship as the same question as textual reuse.

The service is designed for individual searches as well as education, publishing, corporate, research and compliance work. Users retain ownership of submitted content; Plagium processes it for analysis, report generation and service improvement. Processing follows applicable requirements such as the EU GDPR and Brazil's LGPD where relevant.

Key features

Similarity reports are practical investigation tools: linked sources let an editor, instructor or researcher inspect context instead of relying on a score alone. Coverage is web-only, so unpublished, private or non-indexed material can escape detection. Plagium characterizes reports as automated estimates, not definitive proof, which makes human review essential for disciplinary, publishing or compliance decisions.

The AI Detector is a distinct screening step based on writing-pattern probabilities. It can flag text for closer examination, but it cannot establish authorship by itself. Treating that signal as a final judgment would be a poor fit for high-stakes academic or employment decisions.

Deep Search accepts Microsoft Word, PDF and native text files. Google Drive integration and a Google Docs Add-on support document-centered workflows. Institutional access includes an API, with published API v2 and v3 documentation. Business solutions can connect with CRM, ERP and document-management systems, while business security provisions include advanced encryption, access control, auditing and support for corporate compliance requirements.

Pricing

Free account

The free account costs nothing and allows five free daily searches, with a 4,000-character limit per free search. It excludes Deep Search and API access. This is suitable for occasional short checks, not routine file analysis or automated workflows.

Monthly plan

Custom pricing applies. It raises the allowance to 10 free daily searches while retaining the 4,000-character free-search limit, and adds Deep Search, priority support, an originality certificate and volume discounts. It suits recurring users who need file uploads and service support, although the published allowance still constrains free searches.

Institutions

Custom pricing applies to the institutional tier. It includes plagiarism detection, Deep Search, the AI Detector, priority support, API access, sub accounts and volume discounts. Schools, publishers and research or compliance teams needing managed users and integration have the clearest reason to choose it.

Prepaid plan

Custom pricing applies. This plan keeps five free daily searches and the 4,000-character free-search limit, while adding Deep Search, an originality certificate and volume discounts. It is a better match for uneven workloads than a recurring commitment, but it does not include the institutional tier's API or sub accounts.

Platforms

Plagium runs on the web, Android and iOS. Google Drive and Google Docs support are useful for teams already working in those environments. API access and corporate-system integrations are reserved for higher-tier organizational use.

Who it's for

Educators and editors can use linked matches to guide source review, while researchers and compliance teams can combine similarity screening with the separate AI-pattern analysis. Companies benefit from enterprise integrations and security controls. It is less suitable for anyone requiring comprehensive access to private or unpublished corpora, or a result that can stand as proof without human assessment.

Pros and cons

Pros

Two distinct checks: similarity analysis and an AI-pattern detector address different review questions.

Useful document workflow: Word, PDF and text uploads, Google Drive and Google Docs support reduce file-handling friction.

Organizational depth: institutional API access, sub accounts and business-system integrations support larger deployments.

Governance features: encryption, access control, auditing and applicable privacy compliance support regulated use.

Cons

Web-only coverage: private, unpublished and non-indexed sources may be missed.

Estimated results: neither plagiarism reports nor AI signals should be treated as conclusive evidence.

Free-account constraints: five daily searches, 4,000 characters and no Deep Search or API access limit serious use.

Custom pricing: monthly, prepaid and institutional costs are not published, complicating budget comparisons.

Alternatives

Choose Noplag instead if you need Windows, macOS, Linux or self-hosted options and a free tier offering three monthly checks of up to 2,500 words. PlagAware is a better fit for URL monitoring, with a free allowance of 10 pages per month and up to 30 monitored URLs. PrePostSEO Plagiarism Checker covers more desktop and mobile platforms and offers a 4.17 USD-per-year annual plan. Copyscape suits users wanting URL scans and API or self-hosted deployment, though its free searches return limited results. Plagius is a paid Windows-focused option with a 6.90 USD one-time 30-day license and no AI detection. Proofademic combines plagiarism and multilingual AI detection with a free 1,000-word tier and a 15.00 USD monthly Essential plan. Compilatio AI Detector uses one-time credit packs, starting at 4.99 EUR for 20 credits and 5,000 words. Copyleaks AI Detector is worth considering when 30-plus AI-detection languages and extension support are priorities.

For broader comparisons, see AI Plagiarism Checkers and Plagiarism Detection Software.

Verdict

Plagium is a strong choice for organizations and professionals who want linked similarity evidence, a separate AI-pattern screen and a path from document uploads to APIs and enterprise systems. Its main reason to look elsewhere is coverage and certainty: web-only searching can miss important material, and every result remains an estimate requiring informed review.

Verdict

Plagium combines similarity checks with a separate AI-pattern detector and document workflows. Treat its results as estimates: some content may not be found, and the free account has search limits and excludes key features.

Where Specifiction places it

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