Best AI Plagiarism Checkers in 2026
Updated
A plagiarism checker comparison needs to account for both what can be examined and how review results fit into your process. Compared on AI writing check and source coverage, these entries also specify maximum document words and supported file formats. Noplag, PlagAware, and Plagium are options to weigh against the materials you review. If results need to move into other systems, check LMS integrations and API access; report export can matter for sharing findings. Free-plan availability and paid-from pricing provide cost context. Consider the document limits and workflow connections you need alongside the checking capabilities listed.
26ranked
8free plans on this page
$0.35/molowest paid tier
8 Oct 2026last checked
Input list AI Plagiarism Checkers 25 channels on this page · 82 of 200 spec lines stated by the makers
Ch Tool Free planPaid fromSource coverageMaximum document wordsSupported file formatsLMS integrationsAPI accessReport export Spec sheet Score
01 Noplag Free planYesPaid from$9.99/moSource coverageMaximum document wordsSupported file formatsLMS integrationsAPI accessYesReport export 3/8spec lines stated 7.8
02 PlagAware Free planYesPaid fromSource coverageMaximum document wordsSupported file formatsLMS integrationsAPI accessYesReport export 2/8spec lines stated 7.4
03 Plagium Free planYesPaid fromSource coverageweb onlyMaximum document wordsSupported file formatsLMS integrationsYesAPI accessYesReport export 4/8spec lines stated 7.3
04 PrePostSEO Plagiarism Checker Free planYesPaid from$5.25/moSource coverageMaximum document wordsSupported file formatsLMS integrationsAPI accessYesReport export 3/8spec lines stated 7.3
05 Copyscape Free planYesPaid fromSource coverageMaximum document wordsSupported file formatsLMS integrationsAPI accessYesReport export 2/8spec lines stated 7.2
06 Plagius Free planNoPaid fromSource coverageweb onlyMaximum document wordsSupported file formatsDOC, DOCX, PDF, OpenOffice, PPT, HTML, RTF, TXTLMS integrationsNoAPI accessNoReport export 5/8spec lines stated 7.2
07 Proofademic Free planNoPaid fromSource coverageMaximum document wordsSupported file formatsLMS integrationsAPI accessYesReport export 2/8spec lines stated 7.2
08 Compilatio AI Detector Free planNoPaid fromSource coverageMaximum document wordsSupported file formatsLMS integrationsAPI accessYesReport export 2/8spec lines stated 7.0
09 Copyleaks AI Detector Free planPaid fromSource coverageMaximum document wordsSupported file formatsLMS integrationsAPI accessYesReport export 1/8spec lines stated 7.0
10 Plagiarisma Free planYesPaid fromSource coverageweb academic + publisherMaximum document wordsSupported file formatsPDF, DOCX, RTF, TXT, HTML, PPTX, XLSX, XLS, FB2, ODT, EPUB, DOCLMS integrationsYesAPI accessYesReport export 5/8spec lines stated 7.0
11 Check-Plagiarism Free planYesPaid fromSource coverageweb onlyMaximum document words7,000 wordsSupported file formatsdoc, docx, txt, pdfLMS integrationsYesAPI accessYesReport exportpdf 7/8spec lines stated 6.9
12 Plagiarism Checker X Free planYesPaid fromSource coverageMaximum document wordsSupported file formatsLMS integrationsAPI accessNoReport export 2/8spec lines stated 6.9
13 PlagiarismSearch Free planYesPaid fromSource coverageMaximum document wordsSupported file formatsLMS integrationsAPI accessYesReport export 2/8spec lines stated 6.9
14 SmallSEOTools Plagiarism Checker Free planYesPaid from$9.8/moSource coverageMaximum document wordsSupported file formatsLMS integrationsAPI accessYesReport export 3/8spec lines stated 6.9
15 DrillBit Free planNoPaid fromSource coverageMaximum document wordsSupported file formatsLMS integrationsAPI accessYesReport export 2/8spec lines stated 6.8
16 SearchEngineReports Plagiarism Checker Free planYesPaid fromSource coverageweb onlyMaximum document words5,000 wordsSupported file formatsDOC, DOCX, RTF, TXT, PDF, ODTLMS integrationsNoAPI accessNoReport export 6/8spec lines stated 6.7
17 StrikePlagiarism Free planNoPaid fromSource coverageMaximum document wordsSupported file formatsLMS integrationsAPI accessYesReport export 2/8spec lines stated 6.7
18 PlagiarismCheck.org Free planYesPaid fromSource coverageMaximum document wordsSupported file formatsLMS integrationsAPI accessYesReport export 2/8spec lines stated 6.6
19 Viper Free planNoPaid fromSource coverageweb academic + publisherMaximum document wordsSupported file formatshtml, htm, txt, rtf, xml, md, pdf, docx, doc, pptx, ppt, odt, epub, odp, ppsx, pages, xlsx, xlsLMS integrationsAPI accessYesReport exportpdf 5/8spec lines stated 6.5
20 DupliChecker Free planYesPaid fromSource coverageMaximum document wordsSupported file formatsLMS integrationsAPI accessYesReport export 2/8spec lines stated 6.4
21 PlagiarismDetector.net Free planYesPaid fromSource coverageweb onlyMaximum document words25,000 wordsSupported file formatsTXT, DOCX, PDF, HTMLLMS integrationsYesAPI accessYesReport exportpdf 7/8spec lines stated 6.4
22 Scribbr Plagiarism Checker Free planYesPaid fromSource coverageMaximum document wordsSupported file formatsLMS integrationsAPI accessReport export 1/8spec lines stated 6.4
23 Turnitin Originality Free planPaid fromSource coverageweb academic + publisherMaximum document wordsSupported file formatsDOC, DOCX, PDF, PPTX, PPSX, XLS, XLSX, PS, RTF, HTM, HTML, WPD, ODT, TXT, HWP, HWPXLMS integrationsYesAPI accessYesReport exportpdf 5/8spec lines stated 6.4
24 Turnitin Similarity Free planPaid fromSource coverageweb academic + publisherMaximum document wordsSupported file formatsDOC, DOCX, XLS, XLSX, PPT, PPTX, PostScript, PDF, HTML, HWP, RTF, ODT, WordPerfect, TXTLMS integrationsYesAPI accessYesReport exportpdf 5/8spec lines stated 6.4
25 iThenticate Free planNoPaid fromSource coverageMaximum document wordsSupported file formatsLMS integrationsAPI accessYesReport export 2/8spec lines stated 6.3
Compare all 25 in a table
| # | Tool | Score | From | Free plan | Paid from | Source coverage | Maximum document words |
|---|---|---|---|---|---|---|---|
| 1 | Noplag | 7.8 | $9.99/mo | Yes | 9.99 /mo | ||
| 2 | PlagAware | 7.4 | €2.99/mo | Yes | |||
| 3 | Plagium | 7.3 | Free | Yes | web_only | ||
| 4 | PrePostSEO Plagiarism Checker | 7.3 | $0.35/mo | Yes | 5.25 /mo | ||
| 5 | Copyscape | 7.2 | $4.95/mo | Yes | |||
| 6 | Plagius | 7.2 | $4.90/mo | No | web_only | ||
| 7 | Proofademic | 7.2 | $15/mo | No | |||
| 8 | Compilatio AI Detector | 7.0 | No | ||||
| 9 | Copyleaks AI Detector | 7.0 | $1.17/mo | ||||
| 10 | Plagiarisma | 7.0 | Free | Yes | web_academic_and_publisher | ||
| 11 | Check-Plagiarism | 6.9 | $4.17/mo | Yes | web_only | 7,000 words | |
| 12 | Plagiarism Checker X | 6.9 | Free | Yes | |||
| 13 | PlagiarismSearch | 6.9 | $27.95/mo | Yes | |||
| 14 | SmallSEOTools Plagiarism Checker | 6.9 | $7.84/mo | Yes | 9.8 /mo | ||
| 15 | DrillBit | 6.8 | No | ||||
| 16 | SearchEngineReports Plagiarism Checker | 6.7 | $1,012/mo | Yes | web_only | 5,000 words | |
| 17 | StrikePlagiarism | 6.7 | No | ||||
| 18 | PlagiarismCheck.org | 6.6 | Yes | ||||
| 19 | Viper | 6.5 | No | web_academic_and_publisher | |||
| 20 | DupliChecker | 6.4 | $9.99/mo | Yes | |||
| 21 | PlagiarismDetector.net | 6.4 | $9.99/mo | Yes | web_only | 25,000 words | |
| 22 | Scribbr Plagiarism Checker | 6.4 | Yes | ||||
| 23 | Turnitin Originality | 6.4 | web_academic_and_publisher | ||||
| 24 | Turnitin Similarity | 6.4 | web_academic_and_publisher | ||||
| 25 | iThenticate | 6.3 | No |
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