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Online Plagiarism Checker by Viper

Welcome to Viper - a leading online plagiarism checker which, using its range of powerful features, can help students, teachers, schools, colleges, universities, and even professionals check their documents for plagiarism and duplicate content.

We're helping thousands of people around the world verify their documents originality every day, and we can help you too!

Start checking today!

Powerful features.

With its easy-to-use interface and highly detailed scanning process, it only takes three simple steps for Viper to review your document for plagiarism and produce a full report.

Simply upload your document using the Viper online app and submit it to be checked for plagiarism against 10 billion sources .

Viper works its magic - it scans against essays, journals, and numerous other sources published on the internet.

You receive a clear and concise plagiarism report , showing exactly where your document has matched to other existing content.

Pay as you go

No subscriptions or monthly plans; just buy credits as you need them and use them to scan your work.

Thousands of happy users

Don't take our word for it; let our users explain exactly how our online plagiarism scanner has helped to make their lives simpler and more productive!

In fact we have found Viper so accurate at finding plagiarism that we now use it to check the work our own writers. Each essay provided by our essay writers is checked against online resources, journals, and all previous work submitted via Viper. Even in-depth work provided from our dissertation writing service can be quickly checked for originality .

Amber Osman

I would definitely, without a doubt, recommend this software, as it has made checking my work so accurate, convenient and quick - and yes, it's FREE!

Dr. Gregory D. Stephens

A user-friendly, reliable, and regular resource for evaluating student papers.

Eileen Taylor

Viper has protected me through my first two years of college!

Dr. Subramonian

There is no doubt Viper is 100% dependable

Mr. Michael More

I can vouch for the fact that Viper's plagiarism scanner is the best plagiarism tool I've ever used.

Plagiarism Checker

A completely free and accurate online plagiarism detector. Simply copy and paste to detect copied content.

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The free version does not support more than 1000 words.

Plagiarism Checker “ PRO ” the most trustworthy plagiarism detection tool

Our mission is to fulfill everyone's NEEDS in plagiarism detection. Most user-friendly interface with plenty of exclusive FEATURES to execute efficiency & reliability mission.

Plagiarism Checker Online for Multiple Languages

Why choose our plagiarism checker.

Our best free plagiarism checker is totally free. It doesn’t charge you anything which means you can conduct as many searches as you like. All you need to do is just copy and paste your content.

This plagiarism checker software offers you a deep and thorough check. With deep search, you get extra levels of plagiarism search and additional result details.

If you don’t want to copy and paste your text, you can alternatively upload the page URL or the file for a quick and free plagiarism check.

Consequences of Plagiarism

Today, copyrighted content has become a constant problem in educational institutions. Students create many assignments using a lot of research in a short period. Many schools/institutions, such as Duke University, have judicial affairs offices. They will review each case of plagiarism and fix penalties.

Most of the outcomes of plagiarism occur once the replication is caught. Institutions have noted that students who duplicate data often fail to learn research and writing skills. Once they leave the institution, all those students lose the ability to create original content because they have only cheated before.

Professional

Countless journalists, academics, writers, and creators have had their reputations damaged by plagiarism accusations. Not only do plagiarists disrupt their ongoing work by getting fired or terminated. They also find it difficult to get work in the future. A particularly egregious instance of plagiarism, or worse, can destroy a person's professional image. It also forces them to change careers to avoid the stigma of plagiarism.

Apart from all the professional and personal difficulties that may arise in certain cases, there are also legal consequences. Copying copyrighted material for profit may result in the plagiarist having to pay some financial losses. In some cases, copying data can subject the plagiarist to criminal prosecution. And the punishment can range from charges to imprisonment.

So, before submitting any content, do a plagiarism check once to see if you have copied it or not. It can protect you from all kinds of harm. You won't have to wait long for results using a duplicate content checker. You can take advantage of this plagiarism checker free and save yourself from embarrassment.

How it detects?

Plagiarism Detector is the free and an intelligent and essay checker software. It doesn't matter if you are a student or a professional, everyone can have benefit from this likewise.

Now, with the help of our plagiarism detector, you can check if your content that you are just seconds away from publishing and considering its uniqueness. If you are web owner, then it is very important to have a plagiarism-free content on your website if you wish to attract maximum traffic. This is the best Free Plagiarism Checker that you will find online as it works the same way as Google.

Built with thorough research on the needs of our customers, all the essential strategies and techniques have been implemented to make results 100% accurate and authentic for everyone.

We analyzed that any anti-plagiarism software is mostly used by students or teacher to check the essays, papers, and reports that they submit or that have been submitted to them. Because plagiarism is unacceptable no matter what type it is . That is why we have particularly designed a system that offers free plagiarism detection which helps students and teachers to check their duplicate content.

Teachers, as well as students, should discourage plagiarism .

You can try our plagiarism detector now, and you will know that it is rightfully the free online plagiarism checker with percentage!

Importance of plagiarism Detector

If you aim at a higher Authority on SERP (Search Engine Results Page) then never take the risk of publishing a heavily duplicated content.

Plagiarized or duplicated content can lead to lower page rank. If you are caught up in a situation where your article, blog or web page content is not entirely unique, then there is a comparatively higher risk of getting blacklisted by search engines especially Google. You can utilize the free plagiarism detection service offered by our similarity checker to check the content from your own website to make sure that no one has stolen the content from your website. Apart from SEO (Search Engine Optimization), our free plagiarism finder can also be utilized by students and teachers for academic uses.

Beware! It is a double-edged sword .

How the plagiarism scanner Works?

It is very simple!

Plagiarism scanner is an intelligent free and most accurate software.

The content you enter is analyzed on the basis of its

• lexical frequencies,,
• word-choice,,
• matching phrases,,

and many other important factors. Your given text is mapped into our internal network, and then it is compared against different databases and the entire internet. We have designed our algorithm to especially ignore statistically common phrases to provide a better and more valuable search for potential plagiarism in the text. Once the plagiarism test completes, the results will appear below along with the match percentage that our best plagiarism tool has found.

The article you have entered is carefully scanned, and so is the entire internet. If complete plagiarized sentences are found, the plagiarism detector will identify the original source of that content and show to you. All you have to do is copy and paste the content in the text box and then click on “Check Plagiarism” button.

It is as simple as it sounds. (How to check plagiarism)

This plagiarism checker free online for teachers, students, and writers will run your text through its database of millions of sites to show you the best plagiarism free report with the detailed results. Alternatively, you can either enter the URL of the website for which you want to conduct a plagiarism check or you can upload the files. Whether it is an article, essay or blog, a thorough sentence check will be conducted for your text in order to give you the most reliable and accurate results.

Online Plagiarism Checker

Understanding the results.

Beside the text box, you are shown the percentage for Checked, Unique, and Plagiarized.

Phrases or sentences shown in the results below are the ones that our plagiarism detector has identified as plagiarized and already exist online, along with the matched percentage. These are the links and by clicking on the “Match Text” you will be redirected to the original source where you can see yourself the plagiarized text. When the plagiarism test is finished, you’ll also be given an exact percentage of uniqueness and plagiarism of your text. However, if your content is completely unique then you will get a congratulations message:

Plagiarism Checker API

The plagiarism checker API allows everyone to add plagiarism detection functionality to their software or applications. Our flexible system allows you to customize your settings to fit your needs. It can grow with your business or personal needs. Most importantly, our reliable services give you peace of mind knowing your data is safe and protected.

Identify Copied Material with Anti Plagiarism Software

Plagiarism can appear in different forms, but the end outcome is always the same: the plagiarist stole something from another person. Plagiarism refers to using some other person’s ideas and information without acknowledging that specific person as the source. Similar to all other forms of theft, plagiarism also has many disadvantages associated with it.

It can take place in both intentional, when you try to pass someone’s content as your own, or unintentional when you forget to mention the source for your work correctly. In spite of the kind, piracy always has consequences when it is discovered. Mostly, the punishment of accidental copying is temporary. Because ascertaining unintentional plagiarism requires knowledge of intent, the overall prestige of the plagiarist becomes the deciding factor.

Plagiarism can occur in any shape either textual or pictorial. So we not only scan the document for the copyrights but also check the duplication for images. You can also perform Reverse Image Search to look for the best matching photos. By using advance image recognition algorithms, it will bring out the matching results from all over the internet and search engines.

Before jumping to direct consequences, here’s a brief detail of how can you make sure your work is not matching with any source. Loads of information, millions of text documents, is attainable on the internet now. So, if you think you can check manually, then you are wrong. No matter, how many articles you read or how many hours you spend, you can never be sure. Hence, the alternative best way you can take help from is a free plagiarism detector. There are many such tools readily available on the internet, providing best services to users. Majority of them, search your material against billions of contents and underlines each sentence which resembles with another posted article.

Free plagiarism checker by EasyBib

Check for plagiarism, grammar errors, and more.

• Expert Check

Check for accidental plagiarism

Avoid unintentional plagiarism. Check your work against billions of sources to ensure complete originality.

Find and fix grammar errors

Turn in your best work. Our smart proofreader catches even the smallest writing mistakes so you don't have to.

Get expert writing help

Improve the quality of your paper. Receive feedback on your main idea, writing mechanics, structure, conclusion, and more.

What students are saying about us

"Caught comma errors that I actually struggle with even after proofreading myself."

- Natasha J.

"I find the suggestions to be extremely helpful especially as they can instantly take you to that section in your paper for you to fix any and all issues related to the grammar or spelling error(s)."

- Catherine R.

Check for unintentional plagiarism

Easily check your paper for missing citations and accidental plagiarism with the EasyBib plagiarism checker. The EasyBib plagiarism checker:

• Scans your paper against billions of sources.
• Identifies text that may be flagged for plagiarism.
• Provides you with a plagiarism score.

You can submit your paper at any hour of the day and quickly receive a plagiarism report.

What is the EasyBib plagiarism checker? 

Most basic plagiarism checkers review your work and calculate a percentage, meaning how much of your writing is indicative of original work. But, the EasyBib plagiarism checker goes way beyond a simple percentage. Any text that could be categorized as potential plagiarism is highlighted, allowing you time to review each warning and determine how to adjust it or how to cite it correctly.

You’ll even see the sources against which your writing is compared and the actual word for word breakdown. If you determine that a warning is unnecessary, you can waive the plagiarism check suggestion.

Plagiarism is unethical because it doesn’t credit those who created the original work; it violates intellectual property and serves to benefit the perpetrator. It is a severe enough academic offense, that many faculty members use their own plagiarism checking tool for their students’ work. With the EasyBib Plagiarism checker, you can stay one step ahead of your professors and catch citation mistakes and accidental plagiarism before you submit your work for grading.

Why use a plagiarism checker? 

Imagine – it’s finals week and the final research paper of the semester is due in two days. You, being quite familiar with this high-stakes situation, hit the books, and pull together a ten-page, last-minute masterpiece using articles and materials from dozens of different sources.

However, in those late, coffee-fueled hours, are you fully confident that you correctly cited all the different sources you used? Are you sure you didn’t accidentally forget any? Are you confident that your teacher’s plagiarism tool will give your paper a 0% plagiarism score?

That’s where the EasyBib plagiarism checker comes in to save the day. One quick check can help you address all the above questions and put your mind at ease.

What exactly is plagiarism? 

Plagiarism has a number of possible definitions; it involves more than just copying someone else’s work. Improper citing, patchworking, and paraphrasing could all lead to plagiarism in one of your college assignments. Below are some common examples of accidental plagiarism that commonly occur.

Quoting or paraphrasing without citations

Not including in-text citations is another common type of accidental plagiarism. Quoting is taking verbatim text from a source. Paraphrasing is when you’re using another source to take the same idea but put it in your own words. In both cases, it’s important to always cite where those ideas are coming from. The EasyBib plagiarism checker can help alert you to when you need to accurately cite the sources you used.

Patchwork plagiarism

When writing a paper, you’re often sifting through multiple sources and tabs from different search engines. It’s easy to accidentally string together pieces of sentences and phrases into your own paragraphs. You may change a few words here and there, but it’s similar to the original text. Even though it’s accidental, it is still considered plagiarism. It’s important to clearly state when you’re using someone else’s words and work.

Improper citations

Depending on the class, professor, subject, or teacher, there are multiple correct citation styles and preferences. Some examples of common style guides that are followed for citations include MLA, APA, and Chicago style. When citing resources, it’s important to cite them accurately. Incorrect citations could make it impossible for a reader to track down a source and it’s considered plagiarism. There are EasyBib citation tools to help you do this.

Don’t fall victim to plagiarism pitfalls. Most of the time, you don’t even mean to commit plagiarism; rather, you’ve read so many sources from different search engines that it gets difficult to determine an original thought or well-stated fact versus someone else’s work. Or worse, you assume a statement is common knowledge, when in fact, it should be attributed to another author.

When in doubt, cite your source!

Time for a quick plagiarism quiz! 

Which of the following requires a citation?

• A chart or graph from another source
• A paraphrase of an original source
• Several sources’ ideas summarized into your own paragraph
• A direct quote
• All of the above

If you guessed option E than you’d be correct. Correct punctuation and citation of another individual’s ideas, quotes, and graphics are a pillar of good academic writing.

What if you copy your own previous writing?

Resubmitting your own original work for another class’s assignment is a form of self-plagiarism, so don’t cut corners in your writing. Draft an original piece for each class or ask your professor if you can incorporate your previous research.

What features are available with the EasyBib plagiarism checker? 

Along with providing warnings and sources for possible plagiarism, the EasyBib  plagiarism checker works alongside the other EasyBib tools, including a grammar checker  and a spell checker . You’ll receive personalized feedback on your thesis and writing structure too!

The  plagiarism checker compares your writing sample with billions of available sources online so that it detects plagiarism at every level. You’ll be notified of which phrases are too similar to current research and literature, prompting a possible rewrite or additional citation. You’ll also get feedback on your paper’s inconsistencies, such as changes in text, formatting, or style. These small details could suggest possible plagiarism within your assignment.

And speaking of citations, there are also  EasyBib citation tools  available. They help you quickly build your bibliography and avoid accidental plagiarism. Make sure you know which citation format your professor prefers!

Great! How do I start? 

Simply copy and paste or upload your essay into the checker at the top of this page. You’ll receive the first five grammar suggestions for free! To try the plagiarism checker for free, start your EasyBib Plus three-day free trial.* If you love the product and decide to opt for premium services, you’ll have access to unlimited writing suggestions and personalized feedback.

The EasyBib plagiarism checker is conveniently available 24 hours a day and seven days a week. You can cancel anytime.  Check your paper for free today!.

*See Terms and Conditions

Visit www.easybib.com for more information on helpful EasyBib writing and citing tools.

For informational guides and on writing and citing, visit the EasyBib guides homepage .

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Why this is the best free essay checker.

Tested most accurate

In the test for the best grammar checker , Scribbr found 19 out of 20 errors.

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You don’t have to register or sign up. Insert your text and get started right away.

Long texts, short texts it doesn’t matter – there’s no character or word limit.

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Nobody's perfect all the time—and now, you don’t have to be!

There are times when you just want to write without worrying about every grammar or spelling convention. The online proofreader immediately finds all of your errors. This allows you to concentrate on the bigger picture. You’ll be 100% confident that your writing won’t affect your grade.

Correcting your grammar

The Scribbr essay checker fixes grammar mistakes like:

• Sentence fragments & run-on sentences
• Subject-verb agreement errors
• Issues with parallelism

Spelling & Typos

Basic spell-checks often miss academic terms in writing and mark them as errors. Scribbr has a large dictionary of recognized (academic) words, so you can feel confident every word is 100% correct.

Punctuation errors

The essay checker takes away all your punctuation worries. Avoid common mistakes with:

• Dashes and hyphens
• Apostrophes
• Parentheses
• Question marks
• Colons and semicolons
• Quotation marks

Avoid word choice errors

Should you use   “affect” or “effect” ? Is it   “then” or “than” ? Did you mean   “there,” “their,” or “they’re” ?

Never worry about embarrassing word choice errors again. Our grammar checker will spot and correct any errors with   commonly confused words .

Improve your text with one click

The Scribbr Grammar Checker allows you to accept all suggestions in your document with a single click.

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With the AI Proofreader, you can correct your text in no time:

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A Grammar Checker for all English variants

There are important differences between the versions of English used in different parts of the world, including UK and US English . Our essay checker supports a variety of major English dialects:

• Canadian English
• Australian English

Why users love our Essay Checker

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Scribbr & academic integrity.

Scribbr is committed to protecting academic integrity. Our plagiarism checker , AI Detector , Citation Generator , proofreading services , paraphrasing tool , grammar checker , summarizer , and free Knowledge Base content are designed to help students produce quality academic papers.

We make every effort to prevent our software from being used for fraudulent or manipulative purposes.

Ask our team

Want to contact us directly? No problem.  We  are always here for you.

• Email [email protected]
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Frequently asked questions

Our Essay Checker can detect most grammar, spelling, and punctuation mistakes. That said, we can’t guarantee 100% accuracy. 

Absolutely! The Essay Checker is particularly useful for non-native English speakers, as it can detect mistakes that may have gone unnoticed.

The exact time depends on the length of your document, but, in most cases it doesn’t take more than a minute.

Free Plagiarism Checker by Quetext

Online plagiarism checker: how it works, enter text into plagiarism detector.

Our plagiarism detection tool, featuring DeepSearch™ Technology, provides a simple and effective method for checking plagiarism. Just copy and paste your content into the tool, then click the 'Check Plagiarism' button.

Check for plagiarism

Quetext’s online tool identifies any potentially plagiarized content throughout your document by running the text through three steps:

• 1. Contextual Analysis
• 2. Fuzzy Matching
• 3. Conditional Scoring

Evaluate plagiarism report

After evaluating the text against billions of internet sources, our plagiarism software will share your plagiarism results, including a score showing the percentage of text that is an exact or near-match to existing text online. (The higher the score, the more plagiarism found in your content!)

Resolve plagiarism risk and add citations

Our ColorGrade™ feature color-codes exact and near matches, letting you address plagiarism by modifying or citing the source. The "Cite Source" tool generates citations in MLA, APA, and Chicago formats for direct insertion into your document.

Plagiarism Checker Chrome Extension

Check the originality of webpage copy directly from your Google Chrome browser with our free plagiarism checker Chrome extension.

Benefits of Doing a Plagiarism Check

Whether producing original content or verifying that of others, there’s a lot to gain from using a plagiarism checker. An accurate, user-friendly plagiarism scanner provides real-time, automatic detection of duplicate content, facilitating the copy-checking process for teachers, students, content writers, and more. Results showing the exact percentage of plagiarized content allow users to see exactly how much text has been copied and where they need to re-word, thus helping to avoid unintentional plagiarism.

For Teachers

Our tool ensures academic integrity by verifying students’ work for originality, aiding educators in grading. From K-12 to higher education, it automates plagiarism checks, freeing teachers to prioritize work quality over originality scrutiny in academic and research papers.

For Students

The prevalence of academic plagiarism is increasing, often unintentionally. A reliable online plagiarism checker offers students peace of mind when submitting academic papers. It's easier to check for potential plagiarism before submission than to defend your writing later. Quetext ensures accurate results and helps students cite sources with its built-in citation generator.

For Copywriters

Plagiarism risk extends beyond academia to business and individual writing. Copied content is a concern for content writers tasked with creating original content on diverse topics. Our plagiarism checker swiftly prevents copyright infringement, ensuring bloggers and writers maintain integrity. Checking lengthy pieces takes minutes, safeguarding companies’ public content and writers’ reputations.

Quetext’s Online Tool Has It All:

• AI detector
• Expanded citation generator
• Individual or team plans
• Bulk file uploads
• Spelling & grammar checker
• 100,000 total words/month per user
• Downloadable originality reports
• Source exclusion

What is AI Plagiarism Detection?

As AI tools advance, creating content that mimics original work can now constitute plagiarism. This underscores the necessity for AI-driven detection tools. Our AI content detector uses sophisticated algorithms to scan and compare vast databases, ensuring accurate identification of plagiarized content. Employing an AI plagiarism checker like these is crucial to maintain integrity in academic and professional spheres, safeguarding against unintentional or deliberate plagiarism.

Plagiarism Checker FAQ

What is plagiarism.

Plagiarism is the act of representing someone else’s work as your own. In educational contexts, definitions vary by institution. It includes direct copying, improper paraphrasing, and self-plagiarism, where one reuses their own work without citation. Plagiarism violates academic integrity and journalistic ethics. In academic writing, producing original work and appropriately crediting sources prevents plagiarized content. Accidental plagiarism occurs when sources are unintentionally cited incorrectly, underscoring the importance of understanding citation practices. Maintaining originality and avoiding plagiarism not only uphold academic integrity but also contribute to creating original content that advances knowledge and scholarship.

What percentage of a paper can be plagiarized (or copied) and still be considered unique?

Generally speaking, similar or exact copies of another source should be kept under 15% for the total text of the article/paper/essay. As a best practice, citations should be used whenever using another original source word-for-word.

What’s the difference between deliberate and accidental plagiarism?

Deliberate plagiarism is purposely copying works from books, articles, webpages, or someone else’s paper and representing it as your original work. Alternatively, accidental plagiarism occurs in a few different ways:

• Incorrectly citing another person’s works
• Failing to paraphrase another person’s works - even when citing it correctly
• Reusing your own previous papers and inadvertently representing it as a new idea

A plagiarism checker works by comparing the submitted copy against known existing content. This sort of similarity checker flags instances of duplicate content, allowing the writer to modify those areas to avoid any claims of plagiarism.

What are the consequences of plagiarism?

The consequences of plagiarizing another person’s work vary by profession. For Students: Maintaining academic integrity is crucial. Students must ensure their work is not plagiarized. Consequences include failing grades, removal from classes, or expulsion. Even if allowed to stay, students may face mistrust and scrutiny. For Copywriters: Copywriters must produce original content. Plagiarized content can damage their reputation and make it hard to get assignments. Ensuring 100% originality is their responsibility. For Journalists: Journalists must uphold high standards of integrity. Plagiarized content erodes trust with readers and publishers, potentially ending careers. They must produce original, well-cited content.

Why is plagiarism bad?

There are several reasons why plagiarism is wrong, all centering around violating academic integrity, undermining originality, and eroding trust. It leads to legal consequences, tarnishes reputations, and stunts personal growth. Avoiding plagiarism preserves credibility, fosters creativity, and upholds ethical standards. Educational institutions and search engines penalize plagiarized content, impacting SEO rankings and visibility. Embracing originality ensures sustainable success and fosters a trustworthy reputation online.

Can AI-generated content be considered plagiarism-free?

AI-generated content, such as text produced by language models like GPT-3, GPT-4, and Gemini, can be considered plagiarism-free if properly used and cited. However, using AI writing tools like ChatGPT without adequate citation can lead to unintentional plagiarism. It's vital to use an AI content detector to ensure originality. High-quality tools that use advanced detection models, like Quetext’s AI Detector, can help identify AI-generated text, minimizing the risk of false positives and ensuring that submissions are plagiarism-free.

How does AI technology impact plagiarism detection?

AI-generated content and AI-generated text are now common, making AI content detection crucial. Detecting AI technology, including advanced algorithms and language models like ChatGPT-3 and GPT-4, has significantly improved plagiarism detection. Tools like Quetext’s AI detector tool utilize these advanced models to compare submitted text against vast databases, ensuring accurate detection of potential plagiarism and copy written by artificial intelligence or generative ai.

Fast and Reliable Results with Quetext