Best Free Plagiarism Checkers 2026: 6 Options Compared
Best free Plagiarism Checkers compared: Quetext, PlagiarismDetector.net, Small SEO Tools, DupliChecker and 2 more, with free-plan limits, platforms and prices from official pages checked October 23, 2026.
•3 min read•Writing & AI Writing
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Quick comparison
| Tool | Price | Platforms | Best for | Tested |
|---|---|---|---|---|
| Quetext | Free (Free plan at $0 per month: 1,000 words for the plagiarism checker and AI detector, 2,000 for the AI summarizer, 500 for the AI humanizer); paid from $14.99 per month (Essential, 100,000 words a month; monthly and yearly options shown, no annual price listed) | Web | Short essays with matched-source highlights | Docs only |
| PlagiarismDetector.net | Free (Free checker with a 1,000-word cap per check and no stated daily limit); paid from $8 per month, billed yearly (Standard, 72,000 words; $19.99 billed monthly) | Web browser | Checking longer work in 1,000-word pieces | Docs only |
| Small SEO Tools | Free (Free basic checker up to 1,000 words per scan; sign-up requirement not clear on the page); paid from $9.8 per month (premium plan) | Web browser | Quick checks of web copy | Docs only |
| DupliChecker | Free (Free plagiarism checker; sources conflict on the per-search cap (older FAQ says 1,000 words, the current homepage says up to 25,000)) | Web browser | Web-copy checks with a possibly higher cap | Docs only |
| Copyleaks | Free (Free trial plan of about 10 pages (roughly 2,500 words) a month) | Web | Occasional checks with a larger allowance | Docs only |
| Scribbr Plagiarism Checker | Free (Free check shows only whether potential plagiarism exists; the full report needs the premium version; free upload box lists a 300-word minimum); paid from $19.95 per per document (premium report, up to 7,499 words) | Web browser | A final check on one important paper | Docs only |
Independent comparison. Paid placements are labelled separately; editorial links earn no affiliate commissions. Learn more.
Good fit if
- You check a short essay (Quetext is the pick)
- You check a long paper in sections (PlagiarismDetector.net is the pick)
- You want to know before paying whether any match exists (Scribbr Plagiarism Checker is the pick)
- You check website copy before publishing (Small SEO Tools is the pick)
Not ideal if
- You need paid-tier features, uptime guarantees or support that these free plans leave out
Free plagiarism checkers compare your text against web pages, and almost every one limits how much you can paste, so the practical question is how long your document is. Quetext gives 1,000 words on its free plan, PlagiarismDetector.net and Small SEO Tools cap at 1,000 words per scan, Copyleaks offers a small monthly trial allowance, and DupliChecker's cap is reported inconsistently between its older FAQ and current homepage. Scribbr's free check only tells you whether potential plagiarism exists; the full report with matched sources is a paid, per-document purchase starting around $19.95. None of the free checkers search paid academic databases or the private repositories universities use, so a clean result does not guarantee your university's checker will agree. Use them to catch missing quotation marks and forgotten citations early, not as proof of originality. Split long essays into sections of under a thousand words and check each, and be aware that pasting text into some sites may add it to their index, so avoid unpublished work you want to keep private. The six tools below are free to try, with the cap noted for each.
Quetext
Free plan at $0 gives 1,000 words for the plagiarism checker and AI detector, with paid plans from $14.99 a month. It highlights matched passages and is easy for students to use.
Price: Free (Free plan at $0 per month: 1,000 words for the plagiarism checker and AI detector, 2,000 for the AI summarizer, 500 for the AI humanizer); paid from $14.99 per month (Essential, 100,000 words a month; monthly and yearly options shown, no annual price listed) (Quetext pricing, checked 2026-10-22).
Platforms and license: Web. Proprietary.
Best for: Short essays with matched-source highlights.
PlagiarismDetector.net
Free checks are capped at 1,000 words each, with no daily limit stated. Paid plans start around $8 a month billed yearly for more words.
Price: Free (Free checker with a 1,000-word cap per check and no stated daily limit); paid from $8 per month, billed yearly (Standard, 72,000 words; $19.99 billed monthly) (PlagiarismDetector.net pricing, checked 2026-10-23).
Platforms and license: Web browser. Proprietary SaaS.
Best for: Checking longer work in 1,000-word pieces.
Worth knowing: Pro is $19.99 monthly or $9.17 a month billed yearly; Premium is $39.99 monthly.
Small SEO Tools
Free basic checker up to 1,000 words per scan. Premium at $9.80 a month raises the limit to 30k words; the sign-up requirement is unclear.
Price: Free (Free basic checker up to 1,000 words per scan; sign-up requirement not clear on the page); paid from $9.8 per month (premium plan) (Small SEO Tools pricing, checked 2026-10-23).
Platforms and license: Web browser. Proprietary SaaS.
Best for: Quick checks of web copy.
Worth knowing: Premium shown as $9.80 per month or $94.08 per year with a 30k word limit.
DupliChecker
Free checker whose limit is reported as 1,000 words in its FAQ and 25,000 on the current homepage. Confirm the live limit before pasting a long document.
Price: Free (Free plagiarism checker; sources conflict on the per-search cap (older FAQ says 1,000 words, the current homepage says up to 25,000)) (DupliChecker pricing, checked 2026-10-23).
Platforms and license: Web browser. Proprietary SaaS.
Best for: Web-copy checks with a possibly higher cap.
Copyleaks
Free trial reported at about 10 pages (roughly 2,500 words) a month, taken from a search listing as the pricing page blocked our fetch. Strong brand with detection of AI-written text.
Price: Free (Free trial plan of about 10 pages (roughly 2,500 words) a month) (Copyleaks pricing, checked 2026-10-22).
Platforms and license: Web. Proprietary.
Best for: Occasional checks with a larger allowance.
Scribbr Plagiarism Checker
Free check says only whether potential plagiarism exists; the full report with sources is a paid per-document purchase starting at $19.95. Good as a go/no-go test before paying.
Price: Free (Free check shows only whether potential plagiarism exists; the full report needs the premium version; free upload box lists a 300-word minimum); paid from $19.95 per per document (premium report, up to 7,499 words) (Scribbr Plagiarism Checker pricing, checked 2026-10-23).
Platforms and license: Web browser. Proprietary SaaS.
Best for: A final check on one important paper.
Which one to pick
- You check a short essay: Quetext
- You check a long paper in sections: PlagiarismDetector.net
- You want to know before paying whether any match exists: Scribbr Plagiarism Checker
- You check website copy before publishing: Small SEO Tools
Limits of this review
Docs-only for Quetext, PlagiarismDetector.net, Small SEO Tools, DupliChecker, Copyleaks, Scribbr Plagiarism Checker: we did not install or run them, so feature claims come from vendor pages. Vendor prices and free limits change; confirm on the linked pricing page before you commit.
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Kevin Fan
Kevin Fan is a SaaS founder. He runs Free Instead Of, which tracks free and open-source alternatives to paid software and checks each price and free-plan limit against the vendor's own pages.
Methodology
Based on official pricing, license and product pages checked between 2026-10-22 and 2026-10-23: Quetext, PlagiarismDetector.net, Small SEO Tools, DupliChecker, Copyleaks, Scribbr Plagiarism Checker. Prices, free limits and licenses are the figures shown on those pages on those dates. No tool on this page was installed or run. No accounts were created.