Plagiarism is a black mark that appears in writing when a writer copies the content of another person or uses AI to do so. It is a type of fraud that is growing day by day in each writing domain, including academic and business.
That is why a good plagiarism detector is necessary for writers to check whether their content is unique or not. A good plagiarism checker evaluates each sentence and assigns a score that indicates whether it is original or copied.
There are multiple plagiarism checkers available on the internet, but not all are reliable. After conducting multiple practical tests using unique and copied texts, we have figured out the performance of different duplicate content finders.
In this article, weβll discuss the top 10 plagiarism checkers, their features, price, and a comparison table. Let’s dive in.
Top 10 Plagiarism Checkers in 2025
Here’s everything we have found out about the top 10 plagiarism checkers available on the internet:
1. ZeroGPT
ZeroGPT plagiarism checker uses smart AI to quickly find copied content in your writing. It compares your text with billions of sources and shows you exactly where matches appear. Itβs a fast and easy way to make sure your work is original.
Key Features:
- Scans deeply using AI to find copied text
- Checks against a huge database and online sources
- Supports over 190 languages
- Finds both obvious and hidden plagiarism
- Upload files to check
- Provides clear, downloadable reports
- Includes extra tools like grammar fix, citation help, and paraphrasing
Price:
It has varied pricing plans, in which you can:
- Check 300 words once for $1
- Check 750 words once for $1
- Monthly plans include 25,000 or 40,000 words, with $0.70 per 1,000 extra words
2. DupliChecker
DupliChecker is easy to use and keeps a record of checked documents. While it catches some plagiarism, it rarely finds full matches. Its downloadable report clearly shows what text is plagiarized.
Key Features:
- It keeps the scan history
- Maintains document format in reports
- It has a clean interface
- Reports do not link to original sources
- Contact form available
Price:
Its starting price is $5/week (10,000 words)
3. Copyleaks
Copyleaks offers detailed plagiarism reports, but itβs not very accurate with scholarly sources. The layout can be confusing, and some data needs to be manually enabled.
Key Features:
- Detects paraphrased, AI-written, or altered content with over 99% accuracy
- Highlights identical, minor edits, and paraphrased matches clearly
- It uses AI to explain why content is marked as flagged
- Detects content in 30+ languages.
Price:
Free to use, and paid plans are also available for advanced features.
3. Small SEO Tools
Small SEO Tools has built-in editing features, including a very reliable plagiarism checker. The reports are easy to read, and plagiarism detection doesn’t change if you scan multiple times.
Key Features:
- Check percentage breakdowns of original vs. plagiarized text.
- Provide detailed reports with source URLs.
- Do not store or share user data.
- Support for various file formats and even webpage URL inputs.
Price:
Free use with an option to upgrade for higher word limits.
4. Scribbr
Scribbr is one of the widely used plagiarism checkers known for its accuracy, especially with edited or paraphrased texts. It works well for academic sources and gives users a detailed, easy-to-read report. It also includes a tool to check for self-plagiarism. Here are the important attributes of this tool:
Key Features:
- Detects plagiarism even in heavily edited content
- Doesnβt store or sell uploaded documents
- Offers 24/7 live support
- Includes a Self-Plagiarism Checker for unpublished work
- It uses colors in the report to show different sources
- Free Citation Generator to fix issues
- Delete documents automatically after 30 days
Price
It has a limited free version, and after that, it charges per document: $19.95β$39.95 (based on word count).
5. QuillBot
QuillBotβs Plagiarism Checker quickly spots parts of your text that need citations and helps avoid accidental plagiarism. It supports over 100 languages and offers detailed, reliable results to keep your work original and credible. It is perfect for students, professionals, and writers who want confidence in their writing.
Key Features:
- Clearly detects potential plagiarism
- Scans text in 100+ languages, including English, Spanish, Chinese, and more
- Provides a detailed plagiarism report with source links in minutes
- Supports multiple file formats like .txt, .pdf, .docx, and .html
Price
It isn’t available for free; full plagiarism checks require a premium subscription with multiple tier options. It starts from $9.5/month.
6. GPTZero
GPTZeroβs Plagiarism Checker helps you quickly check if your text matches content found online or in databases. It helps you spot copied material and find where citations are needed to avoid accidental plagiarism. Itβs useful for students, writers, researchers, and businesses who want to keep their work original and trustworthy.
Key Features:
- Easy text input or file upload option.
- Provides a similarity score that shows how much text matches online sources
- Highlights exact parts that may be plagiarized with source links
- Offers report download option to analyze AI-generated vs. human text
- Easily integrates with popular classroom tools like Google Classroom, etc.
Price:
Free basic use with option to upgrade for more features
7. PlagAware
PlagAware is a professional plagiarism detection tool used by schools, universities, writers, and businesses. It checks your text against over 70 billion sources as well as detects paraphrased content. It provides clear reports and keeps all the data secure.
Key Features:
- It scans your text against 70+ billion sources
- Spots paraphrased and reworded content
- Free re-scans after your first check
- Clear, visual match reports
- Fully secure and GDPR-compliant
Price:
It costs β¬12.99 for 100 pages, β¬24.99 for 250, β¬39.99 for 500, and β¬89.99 for 1500 pages.
8. Grammarly
Grammarlyβs plagiarism checker helps you make sure your writing is original. It scans your work against billions of web pages and gives you a quick score showing how unique your content is. You also get help fixing plagiarism issues and improving your writing at the same time.
Features
- Language and style suggestions included
- Citation assistant for missing references
- Doesnβt share or sell documents
- Character and word limits apply
- Support via form and help center
Price:
Free to use with a 10k-word per check limit.
9. PapersOwl
PapersOwl is another free plagiarism checker that quickly scans your text for originality with no word limit. It works with all common file types and helps students and writers ensure their work is unique and properly cited.
Features
- It checks your text deeply and in real time.
- You can check as much text as you want.
- It works with all the file types you usually use, like PDF, DOCX, and TXT.
- It helps you spot exactly where your sources come from.
- You can use it anytime, day or night.
- It also offers rewriting and editing services to make content plagiarism-free.
Price:
It is free to use but has paid editing and rewriting services as well.
10. Prepostseo
PrePost SEO offers a plagiarism checker that helps students, teachers, writers, and researchers find duplicate content. It scans your text and shows the plagiarism percentage along with sources, making it easy to fix and improve originality.
Key Features:
- Quickly checks for copied content
- Uploads files like Word or PDF
- Excludes URLs and quotes
- Downloads detailed reports
- Built-in rewrite tool to fix plagiarism
- Doesnβt store or share uploaded content
Price:
1200 words/scan in the free plan, and after that, a paid plan.
Comparison Table of Top 10 Plagiarism Checkers
Here’s a comparison table of the discussed 10 plagiarism checkers:
| Tool | Key Features | Report Quality | Price |
| ZeroGPT | AI scans, file uploads, grammar & citation tools, 190+ language support | Clear and downloadable | $1 per 750 words check, and more |
| DupliChecker | Scan history, preserves formatting, simple UI | Basic; no source links | $5/week (10,000 words) |
| Copyleaks | Detects edits/paraphrasing, keeps formatting, requires manual steps | Easy to read (especially PDF) | Free |
| Small SEO Tools | Built-in editor, consistent results, full matches, PDF export | Simple and easy | Free |
| Scribbr | Catches paraphrasing, self-plagiarism tool, 24/7 support, auto-deletes documents | Detailed and color-coded | $19.95β$39.95 per document |
| QuillBot | Citation feedback, file support, detailed analysis | Detailed with source links | Start from $9.5/month |
| GPTZero | Similarity score, highlights copied text, classroom tool integrations, download reports | Easy to analyze and download | Free for basic use |
| PlagAware | Checks against 70B+ sources, detects paraphrasing, GDPR-compliant | Simple and clear | β¬12.99ββ¬89.99 (100β1500 pages) |
| Grammarly | Suggests citations, originality score, no document storage | Quick uniqueness score | Free (10k words per check) |
| PapersOwl | Unlimited checks, real-time scan, supports all file types | Simple with real-time match identification | Free; paid for editing services |
| PrePostSEO | Fast scans, source reporting, rewrite tool, does not store content | Includes sources | Free (1200 words/scan); paid plans |
Conclusion
The right plagiarism checker depends on your specific needs. It can be academic precision, ease of use, language support, or budget. This article has thoroughly compared the top 10 plagiarism detection tools, their key features, pricing, and effectiveness.
But which plagiarism checker is right for you? The answer is that there is no one-size-fits-all solution. Each option offers unique benefits for students, writers, professionals, and educators.
After reading this article, you are now able to choose the best plagiarism checker to keep your writing original, credible, and plagiarism-free.
