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View detailsDuplichecker
Free online tools for plagiarism checks, SEO analysis and paraphrasing.
Duplichecker is a long-running online toolkit built around plagiarism checking. You paste text, upload a document, or enter a URL, and it scans the web for matching content, then reports a similarity percentage with a list of sources so you can see exactly where any overlap comes from. The basic checker is free and works without creating an account.
Key Features
- Plagiarism checker with similarity percentage and matching source list
- Checks by pasted text, file upload (.docx, .txt, .pdf, .rtf, .odt), or URL
- Paraphrasing tool for rewriting sentences and passages
- AI content detector for GPT-generated text
- Grammar checker and reverse image search included
- Downloadable PDF plagiarism reports and deep/academic scan modes on paid plans
Pricing
| Plan | Price | Details |
|---|---|---|
| Free | $0 | Free plagiarism checks with no account needed, limited to 10,000 characters per search, plus free paraphrasing, grammar, and AI detection tools with daily limits. |
| Basic | From $9.99/mo | Weekly plans from $5/week, monthly from $9.99/month, or $110/year. Raises word and search limits, adds URL checks and PDF reports. Confirm current prices on the official site. |
| Pro / Enterprise | Up to $200/mo | Higher tiers for heavy users, teams, and institutions, adding deep and academic scans, more searches and words, extra user seats, and API access. Top plan Enterprise X is $200/month or $2,000/year. |
Prices as listed in 2026 research. Always check the official site for the latest price — plans change. Free plan: Yes — it has a free plan.
Best for: students, writers, and marketers who want a quick free plagiarism check before submitting or publishing content.
Popular with: Writers, Students, Teachers
Popular with: Writers, Students, Teachers
How it works
Beyond plagiarism, the site bundles a wide set of writing and SEO helpers in one place: a paraphrasing tool, a grammar checker, an AI content detector, a reverse image search, and keyword and text-analysis tools. That makes it a practical all-in-one stop for students checking an assignment, writers polishing an article, and marketers verifying content before it goes live.
The free tier covers quick checks, but the limits are tight for regular use, so paid plans raise the word and search caps and unlock deeper scans, including academic scan and the option to exclude quotes and bibliography entries. Paid plans are sold weekly, monthly, or yearly, starting from $5 a week, which suits one-off projects as well as ongoing work.
Pros and Cons
✓ Pros
- Core plagiarism checker is free with no account required
- Wide toolkit in one place: paraphrasing, grammar, AI detection, and image search
- Weekly plans from $5 make one-off checks affordable
- Clear reports with similarity percentage, sources, and PDF download
✗ Cons
- Free checks are limited to 10,000 characters per search
- Deep scan, academic scan, and quote exclusion are paid-only
- Detection accuracy is mixed in independent tests, so results need a second look
Frequently Asked Questions
Is Duplichecker free?
Yes — Duplichecker has a free plan. Free plan; paid plans from $5/week or $9.99/mo
What is Duplichecker best for?
students, writers, and marketers who want a quick free plagiarism check before submitting or publishing content.
What kind of tool is Duplichecker?
Duplichecker is a SEO Tools tool on VerlumoAI.
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View detailsLast reviewed: November 2026