7 Best Plagiarism Checkers of 2024 for Writers and Editors

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 an in-depth list of leading plagiarism checker software solutions designed 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.

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.

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.

2. 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.

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

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.

3. 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. 

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

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.

4. 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.

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

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.

5. 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.

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

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.

6. 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.

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

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.

7. 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.

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

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.

Bonus plagiarism checkers

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

• Plagiarism Checker X: best known for its online resources
• Compilatio: best known for in-process evaluation

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.