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10 Best Plagiarism Checkers of 2025 for Writers and Editors

20 de Diciembre de 2024
por Harshita Tewari

Every writer aims to craft content that's uniquely theirs. But with the internet overflowing with information, the fear of unintentional plagiarism looms large. I get it! Sometimes, it can be difficult to distinguish between drawing inspiration from others and unintentionally infringing on their work. 

Manual checks for plagiarism take so much time and may not catch all instances of self-plagiarism or accidental plagiarism. Thankfully, plagiarism checkers exist to maintain originality in your writing and guard you against potential reputational damages, academic setbacks, and legal issues.

To help you find the right tool, I collaborated with our in-house plagiarism checker expert, Marina, to evaluate 42 plagiarism detection tools. 

Forget sifting through endless reviews! We've compiled a list of the top 10 best plagiarism checker solutions to preserve your original content. Keep reading to find the best fit for you!

How did we select and evaluate the best plagiarism checker?

At G2, we rank plagiarism checkers using a proprietary algorithm that considers customer satisfaction and market presence based on authentic user reviews. Our market research analysts and writers (Marina and I, in this case) spend weeks testing solutions against multiple criteria set for a software category. We give you unbiased software evaluations; that's the G2 difference! We didn’t accept payment or exchange links for product placements in this list. Please read our G2 Research Scoring Methodology for more details.

1. Grammarly: best known for real-time evaluation

Grammarly is a cloud-based writing assistant that checks grammar, spelling, punctuation, and plagiarism. It also offers suggestions for clarity and engagement. Grammarly easily integrates with various platforms, so you can polish your writing wherever you work.

Grammarly features

  • Custom database creation to check plagiarism 
  • Itemized plagiarism results
  • Citation finder

Marina and I liked the Grammarly extension. It checks your writing as you work in content tools like HubSpot and Google Docs. The extension now also provides artificial intelligence (AI) assistance for generating ideas and improving written content, a great addition.

Grammarly

Grammarly pricing

  • Free plan, but the plagiarism checker is unavailable
  • Grammarly Premium: $12 per month, billed annually
  • Grammarly Business: $15 per member per month, billed annually
What users like best:

I like Grammarly Business because it helps me improve my written communication in various ways, such as identifying and correcting grammar and spelling errors, detecting plagiarized content, and providing suggestions for improving tone and style. It's also user-friendly and integrates well with other commonly used tools, making it a convenient and effective writing assistant for teams and individuals.”

- Grammarly Review, Gokul V.

What users dislike:

“The plagiarism checker tool needs to be more sensitive for us to rely on it as our sole tool.”

- Grammarly Review, Julia D.

Interested to find out how Grammarly measures up against other solutions? Check out the top 10 Grammarly alternatives.

¿Quieres aprender más sobre Software de Verificación de Plagio? Explora los productos de Verificador de plagio.

2. GPTZero: best known for human vs. AI detection

GPTZero is an AI detector that can classify text from models like ChatGPT, Gemini, Claude, and Llama. It also provides plagiarism detection features, examining written text for plagiarism and presenting results as a percentage of similarity. Furthermore, it cites the sources from which the text may have been copied. 

GPTZero features

  • Real-time content monitoring
  • Content management systems (CMS) integration
  • Content identification

We liked how the tool flagged specific sentences and indicated how many words matched online resources, along with the sources they came from.

GPTZero

GPTZero pricing

Plagiarism detection is available as a premium feature starting at $12.99/month, paid annually.
What users like best:

“GPTZero is really user-friendly. With a single click, I can tell if the text is AI generated. Deep scanning and plagiarism detection are also quite important capabilities, but the writing analysis tool is my personal favorite. Additionally, if I ever have any issues or need help with my account, contacting customer support is quick and simple.

- GPTZero Review, Shahrukh S.

What users dislike:

“Plagiarism detection is not available in the free version or essential version but only available in premium.”

- GPTZero Review, Verified User in Writing and Editing

Can't decide between GPTZero and Grammarly? Check out our side-by-side comparison of GPTZero and Grammarly to discover which option fits you best.

3. Feedback Studio: best known for web compare for originality

Feedback Studio (Turnitin) plagiarism detection software shines in academic institutions. It checks students' work for potential plagiarism and generates similarity reports. Educators have made it popular for its help in encouraging proper citation practices and maintaining academic integrity.

Feedback Studio (Turnitin) features

  • Academic database
  • Detection of similar text
  • Auto-detection of manipulated text

The QuickMarks™ feature for leaving drag-and-drop comments stood out to us. It cuts way back on grading time.

Feedback Studio (Turnitin)

Feedback Studio (Turnitin) pricing

Contact the Turnitin sales team to learn about the pricing.
What users like best:

It’s simple to use, flags any plagiarized text immediately, and generates reports up to 40 pages long while still detecting copyrighted material, including AI-generated content.”

- Feedback Studio (Turnitin) Review, Mohit G.

What users dislike:

“Like most technologies, it's not going to catch everything. Plus, some flagged assignments might be legitimate student work, so double-check, especially if multiple students were allowed to work together to create a thesis or topic sentences.”

- Feedback Studio (Turnitin) Review, James T.

Can't decide between Feedback Studio and GPTZero? Check out our side-by-side comparison of Feedback Studio and GPTZero to discover which option fits you best.

4. Copyleaks Plagiarism Checker: best known for its proprietary plagiarism detection database

Copyleaks Plagiarism Checker, an AI detector and online plagiarism checker performs cross-language plagiarism checks in 30 languages, including English, Spanish, Portuguese, German, and Chinese. It also uncovers paraphrasing and hidden character tricks, schedules recurring scans, and sniffs out AI-generated text. This AI plagiarism checker offers a custom reporting experience and various resources for in-depth analysis. 

Copyleaks Plagiarism Checker features

  • Color-coded detection 
  • Batch file scans
  • Real-time AI-content evaluation

We liked Copyleaks’ inclusion of optical character recognition (OCR) technology for directly examining text from an image to detect instances of plagiarism.

Copyleaks Plagiarism Checker

Copyleaks Plagiarism Checker pricing

  • AI + Plagiarism Detection: $13.99 per month, billed annually, up to 1,200 credits
  • Plagiarism Detector: $8.99 per month, billed annually, up to 1,200 credits
What users like best:

I appreciate Copyleaks' versatility in handling various content types. Whether it's academic papers, business documents, or creative writing, the tool's capability to analyze diverse content ensures that we maintain originality across our projects.”

- Copyleaks Plagiarism Checker Review, Kamran A.

What users dislike:

“While other competitors offer a free trial, Copyleaks' free version has limited functionality, such as restricted number of scans or depth of analysis, restricting full exploration of its capabilities.”

- Copyleaks Plagiarism Checker Review, Alejandro A.

Can't decide between Copyleaks Plagiarism Checker and Feedback Studio (Turnitin)? Check out our side-by-side comparison of Copyleaks Plagiarism Checker and Feedback Studio (Turnitin) to discover which optionfits you.

5. Plagiarism Checker X: best known for its online resources

Plagiarism Checker X is a plagiarism detection platform, popular among students, teachers, writers, and digital marketers. It offers several features like multi-language support, side-by-side similarity check, readability check, comprehensive reports, and user privacy protection that make it easy to identify plagiarised text and make better content.

Plagiarism Checker X features 

  • Checks for plagiarism by comparing it to online content
  • Plagiarism check against the vendor's database 
  • Offers private cloud storage for uploaded content

We found the ability to scan documents in bulk very impressive. This feature is especially helpful for teachers with several submissions to review.

Plagiarism checker x

Plagiarism Checker X pricing 

  • Free plan
  • Professional plan: $39.95, one time payment 
  • Business plan: $147.95, one time payment
What users like best:

“It's user friendly interface combined with the detailed review of text is something that really comes in handy when running plagiarism check on lengthy pieces of text.

- Plagiarism Checker X Review, Vineet S.

What users dislike:

“Sometimes the plagiarism percentage varies on each check.”

- Plagiarism Checker X Review, Sarwat F.

Thinking about Plagiarism Checker X and Copyleaks Plagiarism Checker? Check out our side-by-side comparison of Plagiarism Checker X and Copyleaks Plagiarism Checker to discover which option fits you.

6. PlagiarismCheck.org: best known for academic plagiarism detection databases 

PlagiarismCheck.org is an essay checker that educators in K-12 and higher education use to detect plagiarism. It compares submitted text against a vast database of sources, such as academic papers, web pages, and publications. It also integrates with various educational tools and has options for customization to suit institutional requirements.

PlagiarismCheck.org features 

  • Personalized content repository for plagiarism check
  • Detailed reporting on types of plagiarism 
  • Real-time originality check

Marina and I thought the integration with various learning management systems made workflow really smooth – a definite plus.

PlagiarismCheck.org

PlagiarismCheck.org pricing 

  • Educational institutes should contact the sales team for a custom quote based on required features.
  • For individuals:

    Basic plan: $5.99 per 20 pages

    Light plan: $9.99 per 50 pages

    Standard plan: $25.49 per 150 pages

    Premium plan: $45.49 per 300 pages

  • For businesses:

    Basic plan: $69 per 1000 pages

    Light plan: $299 per 5000 pages

    Standard plan: $599 per 10000 pages

What users like best:

Having a Google Chrome Extension saves time and allows me to check everything right in the browser window. Our content is protected from any kind of plagiarism and AI tricks.”

- PlagiarismCheck.org Review, Tanya P.

What users dislike:

“Wish there was a mobile app because sometimes a crisis happens unexpectedly when you are not near the desktop.”

- PlagiarismCheck.org Review, Andrew S.

Thinking about PlagiarismCheck.org and Plagiarism Checker X? Check out our side-by-side comparison of PlagiarismCheck.org and Plagiarism Checker X to discover which option fits you.

7. ProWritingAid: best known for plagiarism similarity reports

ProWritingAid comes with tools for grammar checking and plagiarism detection. It helps refine the voice and improve clarity by providing in-depth feedback on style, readability, and sentence structure.

ProWritingAid features

  • In-depth plagiarism report
  • Sentence rephrasing recommendations
  • Extensive plagiarism check database

We like the inclusion of a custom database so users can create a library of reference documents to consult when checking for plagiarism.

ProWritingAid

ProWritingAid pricing

  • Free plan
  • Premium: $7 per month, billed yearly
  • Premium pro: $8 per month, billed yearly
  • Plagiarism checks are billed separately
What users like best:

Of the many editing programs I've tried, I found PWA the easiest and most thorough. I send all my manuscripts through it and depend on PWA to catch my errors and omissions. It works fast, and it not only fixes my writing, but I learn from their hints as well. I can't think of another editing aid as efficient and easy to use.”

- ProWritingAid Review, David S.

What users dislike:

“Being an artificial intelligence, it can't replace the human eye entirely. Some of the suggestions or corrections are simply wrong, and the program won't always get the small nuances of what you've written. You still need your own judgment and knowledge for a good number of suggestions.”

- ProWritingAid Review, Elli C.

Can't decide between ProWritingAid and PlagiarismCheck.org? Check out our side-by-side comparison of ProWritingAid and PlagiarismCheck.org to discover which option fits you.

8. Noplag: best known for citation assistance

Noplag is a versatile writing assistant with plagiarism detection at its core. It helps with essays, articles, dissertations, research papers, book reviews, and case studies. Access Noplag via web browser, mobile app, or desktop app. Its key features include customizable plagiarism detection settings, an online editor with integrated grammar and style checking, citation support, and template writing.

Noplag features 

  • Citation checker and assistance
  • Proofreading tools
  • Huge publication database
  • Live plagiarism search across the web

What stood out about Noplag is its outline templates, which are a great starting point for content like cover letters, CVs, articles, and essays.

Noplag

Noplag pricing

  • Subscription model:

    Starter plan: $72 per year

    Premium plan: $108 per year

  • Pay-as-you-go model:

    1 check: $1

    3 checks: $4

    Multiple checks: $1 per check

What users like best:

It’s very easy to use, and has an intuitive user interface and a great customer support team. It easily identifies plagiarism.”

- Noplag Review, Charles N.

What users dislike:

“Noplag is text-based and can’t detect plagiarism in non-text content.”

- Noplag Review, Sanjeev K.

Can't decide between Noplag and ProWritingAid? Check out our side-by-side comparison of Noplag and ProWritingAid to discover which option fits you.

9. WriterZen: best known for multilingual plagiarism check

WriterZen positions itself as a one-stop shop for SEO content creation, offering tools for topic discovery, plagiarism checking, keyword analysis, and writing assistance. It enhances online brand presence and simplifies workflows from research to execution and project management.

WriterZen features 

  • Duplicate content check
  • Plagiarism check against Google’s database

Marina and I found the itemized reporting feature really helpful. It generates reports that break down plagiarism rates by specific type.

WriterZen

WriterZen pricing

  • Free trial: 15-day free trial available
  • All-in-one basic: One-time fee of $150
  • All-in-one advanced: One-time fee of $225
What users like best:

“WriterZen has been a great way for me to save time and still get the content I need. With their easy-to-understand features, I was able to find the keywords that I need to rank for in minutes. Plus, the plagiarism checker is a bonus! The UI is pretty, too. The direct data pulled from Google made it easier for me to visualize my ideas. Thank you for creating this wonderful tool!

- WriterZen Review, Sara V.

What users dislike:

“Some users have expressed concerns about WriterZen's pricing structure, which may be prohibitive for smaller businesses or individuals. Additionally, some users have noted that WriterZen's integrations with other tools are somewhat limited, which may be a drawback for those who rely on a wide range of software solutions. Finally, there is a bit of a learning curve to fully utilize all of WriterZen's features, which may be challenging for some users.”

- WriterZen Review, Huy T.

Can't decide between WriterZen and Noplag? Check out our side-by-side comparison of WriterZen and Noplag to discover which option fits you.

10. Compilatio: best known for in-process evaluation

Compilatio is widely used by educational institutions to prevent and check for plagiarism. In addition to similarity checks, it evaluates students' adherence to writing and citation guidelines and provides tools for raising awareness and training regarding intellectual property. Moreover, Compilatio can be integrated with various LMS and offers an open and customizable API to simplify the plagiarism detection process.

Compilatio features 

  • Reports on rates of specific plagiarism types
  • Scans for plagiarism using robust academic research sources

The Single Sign-On (SSO) system is a valuable feature that makes it easier for users to log in.

Compilatio

Compilatio pricing

Contact the Compilatio sales team to learn about the pricing.
What users like best:

“Compilatio's seamless integration with various educational platforms streamlines plagiarism detection and ensures a more efficient workflow for educators and students alike. Additionally, it's easy to use and implement in a few steps.

- Compilatio Review, Abhishek R.

What users dislike:

“It sometimes produce false positives, flagging common phrases or properly cited content as plagiarism. The pricing may also be a bit high for smaller institutions or individual users.”

- Compilatio Review, Sobia K.

Interested to find out how Compilatio measures up against other solutions? Check out the top 10 Compilatio alternatives.

Bonus plagiarism checkers

Marina and I also found these great tools during our research. 

Click to chat with G2's Monty-AI

Find the best plagiarism checker

Accuracy, database size, report clarity, and analysis stand out as non-negotiable features for plagiarism checkers. Look for components that will improve your workflow, such as ease of use, batch processing, and integration with your preferred writing software. Remember that pricing plans vary significantly, so find one that suits your budget and usage needs.

We hope this compilation of the best plagiarism checkers will help you find the right tool to write with confidence.

AI-generated content has the potential to do more harm than simply bore readers. Make sure your content is engaging and legal with AI content detection tools.

Harshita Tewari
HT

Harshita Tewari

Harshita is a Content Marketing Specialist at G2. She holds a Master’s degree in Biotechnology and has worked in the sales and marketing sector for food tech and travel startups. Currently, she specializes in writing content for the ERP persona, covering topics like energy management, IP management, process ERP, and vendor management. In her free time, she can be found snuggled up with her pets, writing poetry, or in the middle of a Netflix binge.