8 Best FREE Plagiarism Checker Software (2025)

Plagiarism is intellectual theft and fraud that involves using someone’s content without permission. It does not provide any credit (either accidentally or deliberately) to original author of the work. Plagiarism also involves unauthorized reuse of previous content and passing it off as new work.

A Plagiarism Checker is application available online that can check a document or some portion of it for plagiarized or duplicate content. These applications scan the internet for other copies of content or documents. Many such tools allow you to check web site URL or add content from documents (.rtf, ex, .doc, .pdf,.txt, .docx, and .odt).

After researching 30+ Best Plagiarism Checker Software for over 110+ hours, I have carefully selected the top free and paid options. My comprehensive and unbiased guide is packed with trusted insights, offering credible pros and cons of each tool. This in-depth article is a must-see if you are looking to find the perfect plagiarism checker. Read more…

Best Free Plagiarism Checker

Name	Database	Free Trial	Link
👍 Plagiarism Checker X	20+ billion	Lifetime Free Basic Version	Learn More
Grammarly	16+ billion	Lifetime Free Basic Version	Learn More
ProWritingAid	20+ billion	Lifetime Free Basic Version	Learn More
Copyleaks	Search Engine Database (Google)	Lifetime Free Basic Version	Learn More
Quetext	Search Engine Database (Google)	Lifetime Free Basic Plan	Learn More

1) Plagiarism checker X

Plagiarism checker X provided me with an accurate solution to check for plagiarism in bulk. I found that it is perfect for handling research papers. According to my review, it helps you easily compare large sets of content.

Plagiarism Checker X is ideal for detecting plagiarism across multiple search engines, making it one of the most effective tools for research papers. I could access side-by-side comparison without any hassle, which helps with efficient editing. It also keeps my data private and supports various formats like DOCX, DOC, PDF, HTML, and RTF. The color-coded results are amazing for clarity, and their 24/7 support ensures you are never stuck.

👉 How to get Plagiarism checker X for Free?

• Go to Plagiarism checker X
• Download basic edition of Plagiarism Checker X for Free.

Visit Plagiarism checker X

Lifetime Free Basic Version

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2) Grammarly

Grammarly is a phenomenal tool that I evaluated for its grammar and plagiarism checks. Throughout my review process, it offered me reliable results by scanning multiple online sources for plagiarism. In fact, it shows duplicate content clearly, helping you resolve the issue fast. Grammarly is ideal for professionals who need to ensure the originality of their writing. I highly recommend it as an amazing tool for writing accuracy.

Grammarly’s extensions and add-ons can be combined with many apps and services. It also ensures high spelling, sentence structure, grammar, and punctuation accuracy. You can rephrase the writeups to look like they were written by a human and improves overall readability. This paraphrasing tool provides many features for professional writers that help them to become great writers, bloggers, and freelancers.

Grammarly allowed me to search content in batches, which is especially helpful when reviewing multiple documents. I particularly liked its plagiarism alerts, which notified me of any text matching online sources or databases. It helps you compare your work against over eight billion web pages, ensuring thorough checks. In fact, Grammarly’s instant reports made it easy to see duplication issues, while its originality score helped me evaluate my document’s uniqueness.

👉 How to get Grammarly for Free?

• Go to Grammarly
• Click on “Get Free” button to get lifetime free basic version of Grammarly

Visit Grammarly >>

Lifetime Free Basic Version

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3) ProWritingAid

ProWritingAid helped me check my work against many sources and gave me new style tips. It was awesome for quickly fixing grammar issues and spelling mistakes. According to my research, ProWritingAid is top-notch and ideal for creating content that connects with readers across platforms, including social media.

ProWritingAid offers a top-notch self-editing experience, with over 20 comprehensive writing reports. I personally recommend its seamless integration with Word, Chrome, Google Docs, and Gmail, which makes it easy to refine your writing across multiple platforms. In my opinion, ProWritingAid is perfect for finding sections in your work that contain questions, ideas, and more, helping you govern your words effectively. It is one of the most popular choices for writers aiming to improve their content.

👉 How to get ProWritingAid for Free?

• Go to ProWritingAid
• Click on “Sign up for free” button to get lifetime free basic version of ProWritingAid

Visit ProWritingAid >>

Lifetime Free Basic Version

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4) Copyleaks

Copyleaks is one of the best plagiarism checkers I reviewed. During my evaluation, I discovered its ability to check text in over 100 languages. It provided me with fast, reliable searches on the web and in various databases to detect plagiarism.

It offers excellent integration with MS Word and Google Docs, making it great for professionals who need reliable content review. Copyleaks provides an automated grading tool that helps to streamline content evaluation, and it even compares two files, which might be helpful to anyone handling multiple documents. I particularly liked its ability to check for code plagiarism, making it a superior choice for developers.

👉 How to get Copyleaks for Free?

• Go to Copyleaks
• Click on “Try It Now” button to try online plagiarism checker for free

Visit Copyleaks >>

Lifetime Free Basic Version

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5) Quetext

Quetext helped me evaluate my thesis by identifying duplicate text across webpages, news articles, and online books. I particularly liked how it uses smart algorithms to find matches, and it also shows them with distinct colors, making it one of the most effective plagiarism checkers.

Quetext provides a plagiarism score that is both impressive and reliable. I could access its free online checker, which is great for teachers. Its interface is user-friendly, and all you need is one mouse click to check for plagiarism.

👉 How to get Quetext for Free?

• Go to Quetext
• It’s a free tool. Enter your text in the text box and hit the ‘Check Plagiarism’ button to Check 500 words for FREE!

Visit Quetext >>

Lifetime Free Basic Plan

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6) CopyScape

CopyScape is a cloud-based tool I checked, and it is perfect for finding stolen content. All you need to do is enter the original content’s URL, and CopyScape will help you check for plagiarism instantly. It is one of the best free plagiarism checkers, offering a great way to run unlimited scans for duplicate web pages.

CopyScape offers a top-rated solution for comparing content side by side, which makes it one of the easiest ways to detect plagiarism. I could access its private index feature, which allows duplication checks within your work. It is ideal for case management and tracking, with the ability to filter results from sites you are already aware of. This top choice Grammarly alternative also supports offline content indexing, providing a user-friendly interface for seamless checks.

👉 How to get CopyScape for Free?

• Go to CopyScape
• “Enter your website link into the search bar and hit the ‘Go’ button to check for matching content for free.

Link: https://www.copyscape.com/

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7) Paraphraser

Paraphraser is one of the best plagiarism checkers that helps you identify matched text percentages in your document. I could access an easy-to-read report in both PDF and Word formats. In my experience, Paraphraser was amazing for collaborating with others. The tool allowed me to quickly whitelist any source I considered helpful.

Paraphraser allowed me to highlight matches in my documents, including web and internal sources. I found that it even works offline, which is helpful. You can share plagiarism reports easily with others, and it is great for comparing documents side by side with matched sources. In fact, you can upload your documents from your cloud drive or computer, making it one of the easiest tools to resolve issues.

👉 How to get Paraphraser for Free?

• Go to Paraphraser
• It’s a free tool. Enter your text in the text box and hit the ‘Check Plagiarism’ button to check your content for free.

Link: https://www.paraphraser.io/plagiarism-checker

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8) SmallSEOTools

SmallSEOTools has offered me a great way to check for plagiarism. I tested this best free plagiarism checker tool, and I particularly liked how it lets you upload different file types like .rtf, .doc, .pdf, and .txt. It also checks many web pages for copied text and allows you to exclude any URL, which helps you save time.

SmallSEOTools offers an efficient plagiarism checker that supports both Dropbox and Google Drive integration. I could download and share plagiarism reports easily with others. This tool is perfect for multilingual users as it supports languages like French, Italian, Portuguese, Spanish, and more.

👉 How to get SmallSEOTools for Free?

• Go to SmallSEOTools
• It’s a free tool. Enter your text in the text box and hit the ‘Check Plagiarism’ button to Check 1000 words for FREE!

Link: https://smallseotools.com/plagiarism-checker/

Other Top Plagiarism Checker Software List

1. BibMe is easy to use tool that enables you to check plagiarism in the document. It allows you to input content from your computer or Google Drive.
2. DupliChecker is an easy to use tool that enables you to find the content online. It supports varieties of file formats, including, .rtf, .txt, .tex, .docx, .doc, and more.
3. Search Engine Reports is one of the best plagiarism checkers that enables you to upload files from Dropbox and computer. It is one of the best plagiarism remover that shows plagiarized content in percentage. You can download the search report.
4. Plagium is a tool that helps you to make sure the originality of content by identifying algorithms. You can perform a quick search by simply pasting text into the window.

What is Plagiarism Checker?

A Plagiarism Checker is application available online that can check a document or some portion of it for plagiarized or duplicate content. These applications scan the internet for other copies of content or documents. Many such tools allow you to check web site URL or add content from documents (.rtf, ex, .doc, .pdf,.txt, .docx, and .odt).

How Did We Choose Plagiarism Checker?

At Guru99, we prioritize credibility, ensuring our content is accurate, relevant, and objective through rigorous review processes. After researching over 30 plagiarism checker tools for more than 110 hours, I have compiled the top free and paid options in this comprehensive guide. It provides unbiased insights, highlighting the pros and cons of each tool to help you make an informed decision. When choosing plagiarism checker software, consider key factors that will guide you to the best option.

• User Interface: Choose a tool that is intuitive and easy to navigate. A user-friendly interface saves time and makes the process more efficient.
• Accuracy: Look for software that provides reliable detection across a variety of sources, including academic papers, websites, and journals.
• Multiple File Formats: The software should support different formats like PDF, DOC, and TXT, ensuring flexibility in checking content.
• Reports and Detailed Feedback: Opt for a tool that provides detailed reports with percentage scores and source links to help improve your work.
• Integration: If you’re working with other writing or editing tools, make sure the plagiarism checker integrates seamlessly with them.
• Number of Users: Consider how many users the software can support, especially if it’s for a team or academic institution.
• Pricing: Evaluate the cost of the tool, ensuring it fits your budget and offers good value for the features provided.

How does the Plagiarism Checker work?

A Plagiarism Checker detects and exhibits plagiarized content. These tools break your document into small chunks and phrases then search each and every phrase in search engines. Such applications scan the internet for other uses of content or documents to find similar content.

Plagiarism checkers use complex proprietary algorithms to detect similar content in paragraphs, sentences, or ideas. If any page contains the same text, the sentence becomes plagiarized. The plagiarism detection software scans documents in real time provides a precise result.

Is Plagiarism Checker accurate?

The accuracy of plagiarism depends on the Plagiarism software you use. Some plagiarism detectors provide accurate results while some tools offer less accurate results. The accuracy of plagiarism is determined by two factors: algorithm and the size of the database used by Plagiarism software. Some plagiarism checkers, including software for plagiarism detection, are only able to identify direct plagiarism, while a good plagiarism detector also identifies instances where similar sentences or words are used.

What are the legal ramifications of not doing plagiarism check?

There is a high chance that the content you create may contain inspirations from previous authors. If you do not check your content in a plagiarism checker, then it will be violation of the author’s right. In that case, criminal charges can be filed against the violator. If your content breaches copyright laws, then there are high chances you will attract legal action as somebody guilty of plagiarizing. Hence, using the best plagiarism checker for students is highly recommended to avoid such situations.

Verdict:

I reviewed multiple plagiarism checking tools to bring you the top-rated ones. Each tool has its unique offerings, and I have shared my verdict to help you make an informed decision.

• 👍 Plagiarism Checker X is a powerful and secure tool, perfect for anyone needing a reliable plagiarism checker with fast results.
• Grammarly presents an excellent combination of plagiarism detection and writing improvement features, making it an ideal choice for writers.
• ProWritingAid provides a phenomenal approach to plagiarism checking, combined with superior writing analysis to elevate content quality.