Free and open first
Best AI Plagiarism Checkers in 2026
AI plagiarism checkers give you options for reviewing documents for copied material and AI writing. Compare AI writing checks and source coverage with maximum document words and supported file formats to understand what each entry can assess. LMS integrations and API access provide criteria for fit with your existing tools, while report export, free-plan availability, and paid-from pricing help round out the comparison. Noplag, Plagium, and PlagAware are among the options shown, along with Plagiarisma and Proofademic. Weigh the listed capabilities against the documents and review workflows you need to support.
- 26 apps
- Research read 23 Sept 2026
- How the order is worked out
- 1
Noplag
Free plan Open source APILinuxMac+3Noplag provides source-linked matching reports for verbatim and near-verbatim copying, with multiple submission formats and a free tier.
- 2
Check-Plagiarism
Free plan AndroidAPIWebCheck-Plagiarism combines file and pasted-text checks with match reports and API access. Before choosing a plan or workflow, note its stated file-limit discrepancy and the 7,000-word document maximum.
- 3
Copyleaks AI Detector
Free plan APIExtensionSelf-hosted+1Copyleaks combines multilingual AI-text detection with explanations, integrations, and an API.
7.6 Visit site - 4
Copyscape
Free plan APISelf-hostedWebCopyscape offers URL checks as well as paid options for document checks, batch searches, and monitoring. Treat AI detector results as one input rather than a sole basis for disciplinary decisions.
- 5
Plagiarisma
Free plan AndroidAPIExtension+2Plagiarisma combines text originality checks with tools for paraphrasing and AI detection across its web, Windows, and Docs offerings.
- 6
Plagium
Free plan AndroidAPIExtension+2Plagium combines text similarity checking with a separate AI Detector and supports several document workflows.
- 7
DupliChecker
Free plan APIWebChoose DupliChecker if you want online plagiarism checking alongside SEO tools, or a free AI detector that accepts pasted text and file uploads.
- 8
PlagiarismCheck.org
Free plan APIExtensionWebChoose PlagiarismCheck.org if you need originality, authorship or AI-content checks with browser access and PDF reports.
- 9
PlagiarismDetector.net
Free plan APIExtensionWebChoose PlagiarismDetector.net if you need web-based plagiarism checks with unlimited quick searches, document uploads, reports, or integration options.
- 10
PrePostSEO Plagiarism Checker
Free plan AndroidAPIiPhone+3PrePostSEO offers several ways to submit text and review matched sources, with downloadable reports and linked writing tools. Free use is limited, and the paid plans have differing submission limits.
- 11
PlagAware
Free plan APIWebPlagAware combines text matching, web monitoring and an AI detector, with reports and multiple submission options. Its exclusion of non-public paid sources is an important coverage limit to consider.
- 12
PlagiarismSearch
Free plan APIExtensionWebChoose PlagiarismSearch if you need similarity reports, AI-writing indicators or integrations such as Moodle and Google Docs.
- 13
Plagiarism Checker X
Free plan WindowsPlagiarism Checker X combines online similarity checks with bulk document comparison, readability analysis, and report exports.
- 14
SmallSEOTools Plagiarism Checker
Free plan APIExtensionWebSmallSEOTools Plagiarism Checker offers multiple input methods, match details, and report exports, with a free scan cap of 1,000 words.
- 15
Proofademic
Free plan APIWebProofademic combines writing checks, sentence-level reporting, and batch review, with stated language coverage across 23 languages.
- 16
Scribbr Plagiarism Checker
Free plan WebScribbr offers a free initial report and detailed paid reports for academic checks, with support for multiple languages and file formats.
- 17
SearchEngineReports Plagiarism Checker
Free plan WebChoose the free checker for repeated web-based checks of up to 1,000 words without signing in.
- 18
Viper
Free plan WebViper offers document checks, configurable scan controls, and downloadable reports through a web app.
- 19
DrillBit
Paid AndroidAPIiPhone+1DrillBit combines source matching with AI-content detection and several integration routes, serving both individual and organizational use.
- 20
Plagius
Free trial MacWebWindowsPlagius combines document similarity checks with an AI-generation estimate and detailed reports.
- 21
StrikePlagiarism
Free trial APISelf-hostedWebStrikePlagiarism combines similarity checking, AI analysis, translated matching and grammar tools.
- 22
iThenticate
Paid APIWebiThenticate focuses on source matching and structured similarity review for manuscripts and other high-stakes documents.
- 23
PlagPointer
Paid WebPlagPointer combines broad plagiarism matching with configurable multilingual AI detection and many upload formats.
- 24
Turnitin Similarity
Paid APIWebTurnitin Similarity combines broad source comparisons with reports and LMS workflows for reviewing student work.
- 25
Turnitin Originality
Paid WebTurnitin Originality combines similarity checking with AI-writing, authorship, and document-metadata insights for institutions.
#1Places #1, #2, #3, #4, #5 on this list can be bought by the makers of the software on it. See the price
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