A reliable plagiarism checker will indicate when you or your students seem to borrow someone else`s ideas. The plagiarism detection tools help you to stay safe, creative – and plagiarism-free. That is why choosing a trustworthy ally in your content-creation or assignment-checking journey is crucial.

Here are the best free plagiarism checkers for your consideration. Please note that they all provide free trial and paid subscription plans or packages.

PlagiarismCheck.org

Main features: 

Strongest sides:

  • Accuracy and depth of Internet plagiarism detection due to the variety of sources.
  • Custom database: users can upload content to avoid copying within a group or submitting already-checked papers.
  • Accurate AI detector.
  • A full range of customer support options, including round-the-clock live support via phone.
  • One of the best solutions on the market in terms of price-quality ratio.
  • Ease of admin: plagiarism detector provides access to usage reports and detailed analysis of results. Ease of setup and use.
  • Learning Management Systems (LMS) integration: Google Classroom, Moodle, Canvas, Google Docs add-ons.
  • API access: one can integrate the tool`s features into other software applications.
  • Strict confidentiality and data protection.

Limitations: Limited database of scientific content.

PlagScan

Main features: Plagiarism detection.

Strongest sides:

  • Accuracy and data protection.
  • Quality of support.
  • Ease of admin, setup, and use.
  • LMS integration.
  • API access.
  • Extended academic databases through partnerships with publishers.

Limitations:

  • Poor academic and limited custom database.

CopyLeaks

Main features:

  • Plagiarism detection.
  • AI Content detection.
  • Gen AI Governance.
  • AI Grader.

Strongest sides:

  • Ease of admin: provides access to reports and detailed results analysis.
  • Ease of use.
  • LMS integration.
  • API access.
  • Depth of internet plagiarism detection.

Limitations: 

  • Limited database of scientific content.

Grammarly

Main features: 

  • Writer assistant: grammar, punctuation, and style checking.
  • Plagiarism detection.

Strongest sides:

  • Grammar and punctuation checking and style enhancement.
  • Ease of setup and use.
  • Integrates with Google Docs, Chrome, and Microsoft Word.

Limitations:

  • No custom database and limited access to academic databases.
  • Plagiarism check results are not always accurate.
  • No LMS integration.
  • Only English language.

Plagramme

Main features:

  • Plagiarism detection.
  • Text formatting.
  • Proofreading.

Strongest sides:

  • Affordability.
  • Free of charge for educators.
  • Responsive customer support.

Limitations:

  • No integration with other platforms.

Duplichecker

Main features:

  • Plagiarism detection.
  • SEO-checking tool.
  • Proofreading.

Strongest sides:

  • Extended free version.
  • Reverse Image Search function availability.
  • Data security.
  • Ease of use

Limitations:

  • According to the users, Reverse Image Search could be more accurate.
  • The paraphrasing tool‘s accuracy is low.
  • Limited databases.
  • Some users find the ads on the site annoying.

Viper

Main features: Plagiarism and duplicate content check.

Strongest sides:

  • User-friendliness and ease of use.
  • Rapid scanning and report generation.
  • Advanced databases and high accuracy.
  • No monthly payments or subscription plans (the pay-as-you-go system is handy for occasional checks).

Limitations:

  • The texts scanned for free are published online.
  • Only pay-as-you-go system may be disadvantageous for businesses and institutions.

Quetext

Main features:

  • Plagiarism checking.
  • Paraphrasing.
  • Citation assistant.

Strongest sides:

  • DeepSearch option in the paid version for more accurate results.
  • Privacy and data protection.
  • Ease of use and accuracy.
  • Citation assistant.

Limitations:

  • The free version limits the number of words you can check and has minimal functionality.
  • According to some users, the scan takes longer compared to other tools. 

Plagiarism Detector

Main features:

  • Plagiarism detection.
  • Paraphrasing.
  • Proofreading.
  • AI-generated content detection.

Strongest sides:

  • Ease of use.
  • Rapid scanning and results generation.
  • Customized paid features.
  • Deep Search function for more accurate results.

Limitations:

  • Limited databases.
  • Low accuracy compared to other tools.
  • Some users find the advertising in the free version “aggressive”.

Plagly

Main features:

  • Plagiarism checking.
  • Duplicate content checking.
  • Grammar Check tool.
  • Citation generation.
  • AI text editor.
  • Media analysis.

Strongest sides:

  • API access.
  • Google Chrome extension and Firefox Add-on availability.
  • Vast database.

Limitations:

  • Unreliable customer support.
  • Users report low accuracy of the checking results.

PlagiarismCheck.org proves to be one of the most efficient, user-friendly, and affordable free online plagiarism checkers for institutions and individuals. Try a free trial now!