Are you struggling to ensure your content is original and free from plagiarism? With the rise in online content creation, the risk of unintentional plagiarism can be high. As a blogger and SEO expert, I constantly use plagiarism checkers to verify that my texts are original and don’t contain uncredited quotes or research.
This blog post will guide you through the best plagiarism checker tools available for 2025, assisting you in making an informed choice that suits your needs best.
Let’s uncover my favorite secret weapons against plagiarism together.
Best Plagiarism Checkers [Key Takeaways]
- Plagiarism is bad. It’s like stealing words or ideas from others, and it can damage your writing and ruin your blog’s reputation.
- Good plagiarism tools help keep your work clean and fair. They find parts copied from other places.
- Bloggers need to think about lots of factors, such as accuracy, cost, ease of use, and what else the tool can do when choosing a plagiarism checker.
- Due to the minor chance of errors in plagiarism checkers, some plagiarism scores are considered acceptable.
Top Plagiarism Checker Tools: Comprehensive Review and Comparison
So, what is the best plagiarism checker online?
Here’s a table based on my personal experience with these tools:
| Tool | Rating (out of 5) | Strengths | Free Trial |
| Winston AI | 4.7 | Detecting AI-generated text and plagiarism | Yes, limited trial |
| Copyleaks | 4.6 | Plagiarism and AI detection, particularly in business and education | Yes, limited trial |
| Scribbr | 4.5 | Academic and educational plagiarism checks | Yes, limited trial |
| Quetext | 4.3 | Simple plagiarism detection for general use | Yes, limited trial |
| Smodin | 4.3 | Plagiarism checker, AI detector, and AI Rewriter tool | Yes, limited trial |
| PlagAware | 4.2 | Educational plagiarism checks and data security | Yes, limited trial |
| Viper | 4.0 | Affordable plagiarism detection for students | Yes, limited trial |
| Grammarly | 3.9 | Grammar, style improvement, and basic plagiarism | Yes, free version with limited features |
| Plagiarism Detector | 3.9 | Free plagiarism, paraphrasing, and AI detection for general checks | Yes |
| Compilatio | 3.8 | Comprehensive academic plagiarism detection | No |
I’ve also prepared an in-depth analysis of the best plagiarism checker tools of 2025, exploring their features to help you decide which is the ideal choice for your specific needs.
Excited? Let’s discover more.
1. Winston AI Plagiarism Checker
Winston AI offers an advanced plagiarism checker, suitable for bloggers, copywriters, educators, and SEO agencies. The tool uses sophisticated technology to check the integrity of your content. It scans text against a myriad of webpages, online resources, and databases to help you avoid duplication.
It not only detects plagiarism but also identifies AI-generated content produced by ChatGPT and other similar tools.
Winston AI’s plagiarism tool supports all languages, which makes it stand out among competitors. It produces comprehensive reports, where you can easily see all plagiarism sources and AI-generated parts.
Moreover, your scanned content is secure in an encrypted storage database. You can also completely delete a checked document. Additionally, Winston AI offers an API for businesses seeking a cost-effective plagiarism checker and AI content detector.
Usability
Winston’s plagiarism checker is easy to navigate, even for not particularly tech-savvy users. The reports clearly highlight the plagiarized content, similarities, and AI-generated text.
Pros
- High accuracy: With a claimed accuracy rate of 99%, Winston is one of the most reliable tools for detecting AI content and plagiarized text.
- User-friendliness: Its intuitive and simple interface makes using this tool effortless and fast.
Cons
- Limited features in lower-tiered plans: Some features, like advanced plagiarism detection and downloadable report options available only in premium plans.
- Limited accuracy and availability in other languages: While multiple languages are available, reviews show that Winston has yet to bring them to the same level as its services in English.
Pricing
Winston AI has a 14-day free trial, and its paid plans start at $12 per month if paid annually. The Advanced and Elite plans are aimed at teams and include numerous additional functionalities.
2. Copyleaks
Copyleaks is a tool known and used by many all over the world. It tells you if someone copied your text on the internet. Copyleaks uses smart tech to find plagiarized content online. What makes this tool different from the rest? It’s not just any checker; it’s AI-based, enabling it to compare thousands of online sources quickly. Users find that it’s easy to use, too. I love how great this tool is at finding copied work fast, anywhere on the web.
Usability
Copyleaks offers an easy, organized dashboard layout, showing you all the features and reports you need. It has additional AI-detecting and cheat detection features.
Pros
- Ease of use: This tool has a straightforward user interface that makes checking your text with it easy and quick.
- Detailed analysis features: This tool lets you compare different documents and offers a cheat detection function that finds hidden characters within the text.
Cons
- Limited free functionalities: It marks plagiarism but all the additional reports are only available with a paid pricing plan.
- Complex pricing: Because it uses credits, it’s hard to figure out what plan offers the best value for your needs.
Pricing
The paid plans start at $8.99 per month if billed annually. This plan includes plagiarism checks only, while a plan that includes AI detection costs $13.99 per month.
3. Scribbr
Scribbr stands out as one of the best plagiarism checkers for students. This tool uses Turnitin, which benefits from a large database and is very precise at finding copied parts. Scribbr’s checker is also known for its ability to detect plagiarism even if the original phrasing has been altered.
Plus, they have experts who edit work of all kinds, such as essays and research proposals. Scribbr also has a unique self-plagiarism checker tool where you can add the sources to check. The latter might include your own past work, unpublished work from your fellow students, unpublished PDFs, or internet pages copied and pasted directly into the checker.
You will find that the prices are fair when you see how well it works. In addition, Scribbr offers a limited free version to test and try.
Usability
Scribbr provides an easy-to-follow, downloadable report with clear, color-coded highlights used for different sources. The Self-Plagiarism Checker is a handy feature, and Scribbr provides live support.
The free version is limited, as it doesn’t give you access to full reports and similarity scores.
Pros
- Advanced checks: Detects plagiarism even if the original phrasing has been altered.
- Self-plagiarism tool: Option for checking your text for plagiarized material from your own past work or unpublished papers.
Cons
- No free trial and high cost: The prices are charged per check, which can make the overall cost too steep for students checking multiple papers.
- No direct editing options: While you’ll get a detailed report, Scribbr doesn’t allow you to edit or change your text directly in the tool.
Pricing
Scribbr charges per document, starting with $19.95 for texts of up to 7,499 words.
4. Quetext
Quetext is a star in the world of plagiarism checker tools. Bloggers use it to spot copied content and keep their work fresh. Launched in 2016, this tool became popular fast.
This allows you to check for duplicate words and ideas in any piece you write. Students love Quetext, too. It helps them prove that their writing is all theirs and they didn’t copy anyone else’s work.
This tool has a free plan. So, if you are worried about the integrity of your blog’s content, think about using Quetext to check your work.
Usability
Quetext stands out with its user-friendly interface and clear reports. On the downside, it lacks color differentiation for the sources used. The free version only allows you to upload and check 500 words at a time.
Pros
- Versatile plans: Has free and paid options, letting you choose a monthly plan, or benefit from lower rates if you pay annually.
- Free Citation Generator: Perfect for creating citations in various styles, like MLA or APA, this tool makes attributing your sources easy and quick.
Cons
- Limited check capacity in the free version: There’s an incredibly low 500-word limit in the free version, which gives the user only a glimpse into the tool’s capabilities.
- No mobile version: You can only use this tool on your computer.
Pricing
Quetext offers free tools for plagiarism checks and AI detection, with a minimal text volume, however. Its Essential plan for individuals costs $13.99 per month if paid annually.
5. Smodin
Smodin stands out as a great tool for checking plagiarism. This software does an excellent job with academic writing. Besides checking for copied content, it also gives you the source of that text.
But the best part is that Smodin works well on Google Docs, too. It can check texts in various languages, not just English. And if you find copied content, Smodin will provide citation and bibliography information on its own.
That makes it stand out from other tools like Scribbr and Quetext. Many people say Smodin is one of the top plagiarism checker tools for 2025.
Usability
Smodin is a handy tool that works with different text formats, including PDF and Google Docs. It’s got a useful summarizing function and an automatic citation feature, saving you a lot of time when referencing your sources in the required style and format.
Pros
- Great citation features: This handy tool gives links to the original sources and helps with correct citations.
- Multiple languages supported: Smodin works with over 100 languages.
Cons
- Reports difficult to read: This tool generates downloadable PDF reports that don’t mark the plagiarized parts clearly.
- Limited reliability: It isn’t great at finding plagiarism in slightly paraphrased and modified text.
Pricing
Smodin has a limited plan for free plagiarism checks, while its paid options start at $12 per month (billed annually).
6. PlagAware
PlagAware is a plagiarism search engine that can compare texts with billions of online sources and reference texts. It has been used by universities, schools, companies, and private users for over 10 years and has won several awards for its accuracy and user-friendliness. PlagAware can detect paraphrased plagiarism, translate texts into different languages, and offer free scans of revisions.
It gives fast results that are also accurate. Using PlagAware helps keep your work original. Your words stay safe from copycats thanks to its strong search tool. With PlagAware, you can rest assured that you have a helpful assistant that recognizes any plagiarism in a matter of minutes.
Usability
The PlagAware plagiarism checker offers straightforward, side-by-side reports explaining the plagiarism results. The interface is simple, although slightly outdated. Inconveniently, PlagAware doesn’t allow you to upload multiple documents or ZIP files for checking.
Pros
- Translation: PlagAware can translate your text in addition to finding instances of plagiarism in your work.
- Privacy: With data centers in Germany, PlagAware guarantees the confidentiality and safety of your work.
Cons
- Detailed but confusing reports: The PDF reports can be hard to figure out due to complex formatting.
- Old-school user experience: While overall reliable, the user interface is outdated and unclear.
Pricing
PlagAware offers a free account with limited credits for plagiarism checks available. For larger documents, there are prepaid packets starting at 12.99€ ($13.69).
7. Viper
Viper is an outstanding tool for checking plagiarism. It looks at your words and compares them to over 10 billion online pieces. Many people like Viper for its big content database and high accuracy.
It stands toe-to-toe with hot names like Turnitin and PlagAware. If you’ve been looking for the best free plagiarism checker to keep your writing fresh and original, then Viper is a great option for you. You can use the paid version to access more features.
Usability
Viper’s reports are detailed and clear, assessing your work against its extensive database, and its interface offers a quick and intuitive user experience. Your work’s safety and privacy can be an issue, though.
Pros
- Version comparison: Allows you to check your previously uploaded texts with the current version to eliminate self-plagiarism.
- Detailed color-coded reports: You can download easily understandable plagiarism reports with clearly marked evaluations.
Cons
- Glitches: It occasionally experiences technical issues like delays and crashes.
- Privacy issues: Unless you choose a premium plan, your work may be shared on student essay writing sites, which is stated in Viper’s Privacy Agreement.
Pricing
Viper’s free plan lets you check texts that contain up to 5,000 words. You can buy as many credits as you need if you want to check longer documents and use more features.
8. Grammarly
Grammarly’s plagiarism checker is a top choice for bloggers. This popular writing tool helps you write clear and error-free posts. It checks your work for grammar errors, making it the best on the market.
But Grammarly does more than fix your commas and spelling or tell you your article’s word count. It also looks out for copied text. This makes it perfect for checking plagiarism in your blog posts. If you are a student or blogger, Grammarly is highly useful. Use it to ensure all of your work is original and unique.
Usability
Grammarly’s strengths are its interface and language assistance features. The report is easy to read but lacks source differentiation.
You need a premium subscription to access more detailed reports, and Grammarly’s efficiency with academic sources is limited.
Pros
- Grammar check included: When you let Grammarly review your work, it not only evaluates plagiarism but also checks your grammar and spelling, providing a quick and easy way to improve your writing.
- Detailed and understandable reports: It gives the links for all marked copied text, making it easy to fix issues when using numerous different sources.
Cons
- False positives: In many cases, the tool marks common phrases and generalizations, making it harder to determine the parts with real plagiarism.
- Limited usefulness for academic works: Grammarly doesn’t check your text against databases of academic papers with paid access, which makes it less suitable for academic writing.
Pricing
Grammarly has free tools for checking plagiarism, as well as grammar and spelling. Its Pro plan starts at $12 / month (paid annually).
9. Plagiarism Detector
PlagiarismDetector.net is a website that offers a very accurate plagiarism checker. This tool is free to use and allows users to upload a file in various formats, copy and paste text, or enter a URL to check for plagiarism.
This online tool compares the text with billions of web pages and educational resources and provides a plagiarism report with matching sources and the percentage of similarity. It also has a grammar checker and a reverse image search feature. It is a useful tool for students, teachers, writers, and researchers who want to avoid plagiarism and ensure the originality of their work.
Usability
This tool is simple to use, and you don’t need registration. The downside of this checker is that it doesn’t provide color coding for sources used in its reports. The free version is also limited to 1,000 words and has somewhat low detection rates.
Pros
- Free: This tool is free to use, letting you upload your file in several formats for checking.
- Additional tools: It also includes a grammar checker and paraphrasing tool that make it handy for improving your text at the same time as you eliminate plagiarism.
Cons
- Ads in the free version: The abundance of ads in the free version makes the tool occasionally annoying to use.
- False positives: Often marks plagiarism when the text contains general expressions and common phrases.
Pricing
PlagiarismDetector.net offers a free plan. Paid plans start at $20 per month. There’s a plan for institutions and customization options.
10. Compilatio
Compilatio is a comprehensive plagiarism checker that helps you ensure the originality and quality of your academic papers. It compares your documents with millions of sources on the web and detects any similarities or potential plagiarism.
If there is plagiarism detected, you can see the following information directly in the tool:
- Percentage of similarity
- Sources of matching text
- Suggestions on how to resolve plagiarism issues
Compilatio is easy to use, fast, and reliable. It is a valuable tool for students, teachers, and researchers who want to avoid plagiarism issues and enhance their writing skills.
Usability
Compilatio’s reports show you detailed information regarding matches, sources used, as well as suggestions for improving your text. There’s no color coding, however, which may make it more difficult to quickly evaluate the report. It’s compatible with numerous text formats, providing a simple and easy user experience.
Pros
- Ease of use: Compilatio has a simple user interface that makes it accessible and convenient.
- Accessibility on all devices: Since it’s cloud-based, this tool is great for use on the go, on whatever device you choose.
Cons
- No color highlighting in reports: The plagiarized text isn’t highlighted in this tool, making it more difficult to address the issues.
- Expensive: Aimed at educators and institutions, this tool’s pricing isn’t very affordable for most students.
Pricing
Compilatio’s pricing is based on credits, starting with a package of 20 credits that lets you check a document up to 5,000 words long for the cost of 4,99€ ($5.26).
How to Choose the Best Plagiarism Checker
When choosing a plagiarism detection tool, key factors such as accuracy, usability, cost, additional features, and customer reviews play a significant role.
Dive into the full comparison to find the best online plagiarism checker tool that suits your needs.
Accuracy
The accuracy of a plagiarism checker tool holds great value. It determines how well the software can detect plagiarism in your piece. You must trust your tools to catch all types of plagiarism. No one wants to face problems with missed spots or false positives. Every accurate plagiarism checker tool scans deep and wide.
This means it checks many pieces of work on the web as well as books. A poorly spotted check could bring low scores, bad reviews, or worse. So, making sure your tool has a high level of accuracy is key to a job well done.
However, keep in mind that even the best plagiarism checker software might not be accurate at all times. No amount of plagiarism is acceptable, but in various fields, certain score ranges are. For example, a plagiarism percentage of 30% is considered fine for blog writing and 15% or below for SEO blogs. Publishers of manuscripts usually allow no more than 5%–7% similarity. For students, the acceptable plagiarism score varies, as it generally should be less than 15%.
“Trying to prevent plagiarism is an ongoing battle due to the advances of AI, the sheer amount of content available on any given topic, and the ease with which people can copy content from the internet and claim it as their own. Fortunately, tools like Grammarly can help spot plagiarism in a few seconds by analyzing millions of web pages, so plagiarized content can be rejected before it is published.” — Nathan Turner, Content Writer, Internxt
Usability
Usability matters when choosing a plagiarism checker tool. Great tools should be user-friendly and simple to navigate. You don’t want to waste time figuring out how to use it. An easy-to-use tool will help you find text similarity quickly.
The quality of support can also make or break your experience with a tool. It’s smart to pick a checker that offers good customer support when you need it. This way, issues get solved quicker. The easier the tool is to use, the more time you save in writing blogs or academic papers.
Cost
Paying for a plagiarism checker tool is part of your blog costs. Not all tools have the same price. Some are cheap, while others can be costly.
There are big differences in cost among these tools. Scribbr’s service ranges from about $19.95 to $39.95, depending on how long your document is. You must also think of how much value you get for what you pay: accuracy, ease of use, and extra uses like grammar checks or a citation generator should weigh into your final choice.
Additional features
Extra tools make it easy to find copied work. These can be links that show where the exact words are used online. Some checkers have tools that highlight parts of your text that match other places on the web.
You might want a checker tool that checks different types of files, too. The tool should allow users to upload different file formats, such as PDFs, Word documents, and more. Check if the tool supports these formats before picking one.
The tool should provide you with a detailed online report as well. It’s important to review it and not just rely on the overall score, as plagiarism checkers work by detecting similarities, not plagiarism, and not all similarities are plagiarism.
Customer reviews
People often talk about their experiences with a plagiarism checker online. These are called customer reviews. They can help you learn more about the tool’s features, accuracy, and how easy it is to use, helping you find the best checker on the market.
Users also share their level of satisfaction with the support they got from the service provider. So, be sure to check out these reviews before choosing a tool.
Importance of Using a Plagiarism Checker
Plagiarism is not only unethical and unprofessional, but it’s also illegal. Utilizing a plagiarism checker is crucial to maintaining academic integrity, protecting original concepts from copyright infringement, and upholding your credibility as a blogger or writer.
“It’s impossible to say enough bad things about copied material. In addition to the instant risk of legal trouble, it is a major threat to the trust that companies work hard to build with their partners, customers, and even other companies in the same industry. In this digitally connected world where data is stored and shared easily, any kind of plagiarism can quickly hurt a business’s image.” — Jason Wise, Editor, EarthWeb
Avoiding academic consequences
You can get into deep trouble if you copy others’ work. Schools do not like it when students cheat and don’t take such occasions lightly. A plagiarism checker tool is your friend here. It helps you know if you have produced original content or not.
So, always use plagiarism checkers to be sure about your work and avoid plagiarism issues at school.
Maintaining credibility
Your work as a blogger must be true and real. It’s part of building credibility. Checking your work for plagiarism helps you to keep your work unique. It shows that you care about being original and fair.
If you post plagiarized content, it can destroy your image. Your readers might give up on following you. So, always check for plagiarism before hitting the ‘post’ button. A good checker tool stops this from happening and keeps your name clean.
“Тrain your staff on plagiarism, ensuring they understand what it is and how to prevent it. In this plagiarism training, provide guidance on citing sources, paraphrasing, and creating original content. By following these steps, you can help ensure that your team is not accidentally plagiarizing others, and make it clear that plagiarism is not acceptable for your company’s content.” — Belen Garcia-Saldaña, Marketing Coordinator, Achievable
Protecting original work
Creating fresh content is crucial for every blogger. But it’s also important to protect original work. Plagiarism checkers help keep your writing unique and safe from copycats.
They protect your hard work and creativity. This way, you show both honesty and respect for other writers’ ideas, too. With these tools, you can guard your blog posts against online plagiarism so they remain one-of-a-kind on the internet.
“The absolute worst-case scenario that I’ve encountered has to do with individuals reposting our blog content without giving due reference. This not only infringes on our rights as the original authors but also significantly impacts our SEO rankings. There have been instances where search engines have flagged our original content as duplicate because it was reposted elsewhere without credit. This is an ongoing struggle in the digital marketing field and one that we continually address through vigilant monitoring and the use of plagiarism detection tools.” — Tim Clarke, Sr. Reputation Manager, RizeReviews.com
Conclusion
There are many plagiarism-checking tools to choose from. It can be hard to know which one is the best. In this guide, I’ve given you a glimpse of what each tool does well and how they differ. The right choice may vary for everyone and ultimately depends on your needs.
FAQ
What is a plagiarism checker tool?
A plagiarism checker tool is software that helps determine if your work copies someone else’s words.
How does a plagiarism checker tool work?
When you run a plagiarism check, the tool compares your texts to books, papers, and other texts on the web. These tools are mostly only able to find partial matches that resemble your input or worse, are exactly the same.
Is it easy to use a plagiarism checker tool?
Yes, using a plagiarism-checking tool is usually as simple as pasting in your text and clicking “check.”
Are all plagiarism checker tools free?
No, while some plagiarism checker tools are available for free, others may require payment for advanced features.
What is the best plagiarism checker for students?
According to various sources, the top five best plagiarism checkers for academic purposes are Scribbr (powered by Turnitin), Grammarly, Smodin, Compilatio, and PlagAware.
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Article by
Nikola Baldikov