best free plagiarism checker

Best Free Plagiarism Checker: 3 Tools to Use in 2019

Google is always on the lookout for original quality content, so trying to plagiarise someone else’s blog post, can really harm your site.

You can also be penalised if Google sees that your website contains duplicate content within the same website, so running your new piece of content through a plagiarism checker should really become a habit, prior to posting your new blog post.

If you are looking for the best free plagiarism checker of 2019, please carry own reading this post in which I have put together 3 tools that do not require you to register nor to pay to perform a plagiarism check.

best free plagiarism checker - 3 tools to use in 2019

What is plagiarism?

Plagiarism is when you use someone else’s ideas and take credit for them.

This doesn’t just apply to text. Using images, videos, music or anything else that was not produced by you, requires you to cite the source of origin.

Here is what is considered as plagiarism:

  • Using someone else’s work without giving them credit
  • Using pieces of text written by someone else, without putting them in quotation marks
  • Making others think that a piece of work is your own, when it actually isn’t

Google is never happy to find plagiarised work, so it is important that the correct steps are taken and that research is done to avoid plagiarism.

Check this video from S.Wood, showing what plagiarism is:

Types of plagiarism

There are many types of plagiarism, but here are 4 of the most common ones:

Accidental Plagiarism

This happens when the person using someone else’s content forgets to cite the original source.

It usually occurs to new writers, who might not know all the rules that need to be applied when using third party content.

Despite being an accident, this type of plagiarism is still considered as serious as any other type.

Direct Plagiarism

Direct plagiarism is when the exact work that belongs to someone else has been used without quotation marks or attributions.

It is basically copying and pasting someone else’s content into your work.

If you wish to use the exact same words of an article you like, then you must put the text within quotation marks and cite the source.

Mosaic Plagiarism

Mosaic plagiarism can be hard to spot, as it entails using bits of text from someone else’s work.

This is also called patchwork plagiarism.

Self Plagiarism

Self-plagiarism occurs when someone re-uses their previous work without letting the reader know that this was already used in the past.

This type of plagiarism is also called auto-plagiarism.

What percentage of plagiarism is acceptable?

Even after doing an extensive internet search, I was not able to find an answer everybody could agree on.

Some websites say it is acceptable to use up to 15% plagiarism, which if you ask me, I think it is way too high!

Other websites say 0%, 1%, 10% and so on.

I personally would not go over 1%.

Always make sure that the borrowed text is not all in one continuous block!

Tool #1: Small SEO Tools – Plagiarism Checker

Small SEO Tools Plagiarism Checker allows you to perform a 1000 words search by either manually entering the text, uploading a document, entering a website’s URL or choosing a file from the cloud.

Smart Seo tools plagiarism checker

Here is how to use it:

  • Copy the text you want to check and paste it into the blank box. Alternatively, you can upload a file, either from your PC or from a cloud service
  • You can exclude URLs or enter a specific one to check if you wish, but it is not necessary
  • Click on “Check Plagiarism” –> Page will automatically scroll down to the results
  • Check “Sentence Wise Results” to view results by sentence
  • Check “Matched Sources” to view title, text and website where your plagiarised text appears
  • Check “Document View” for a plain view of plagiarised text

Both the “Sentence Wise Results” and “Matched Sources” feature present a “Compare” functionality which will take you directly on the website where the plagiarised text is. This way you will be able to view the entire article.

You have the options to download or share the report if you wish.

This tool also offers you the opportunity to rewrite the plagiarised sentence. Clicking on “Rewrite Plagiarised Content”, will take you to the “Article Rewriter” tool.

I have personally tested the article rewriter tool, and I recommend you do not use it. Rewritten sentences never made any sense when I tried it!

However, the plagiarism checker tool itself is quite accurate and all the little features make it a nice free tool to use.

Tool #2: Plagiarism Detector

Plagiarism Detector also has a limit of 1000 words and presents the “Enter URL” and “Upload Files” features just like the plagiarism checker tool above.

plagiarism detector

This plagiarism detector is very simple to use:

  • Copy the text you wish to check and paste it into the text box
  • Click on “Check Plagiarism”
  • Scroll down to see the results
  • Click on “Match” text to see the article that presents the same text

There is no option to download the report, nor to upload a file from the cloud but you can upload files from your PC or search for text by specifying the URL.

There is also no “re-write article” feature, but given that this never works really well, I don’t think it is necessary to have it as part of Plagiarism Detector.

Tool #3: Prepost SEO – Plagiarism Checker

Prepost SEO – Plagiarism Checker also has a limit of 1000 words. There is no “Enter URL” feature but you can exclude the ones you do not want to include in your check, such as your own website.

Two features offered by this tool which are not available with the other two, are:

  • Google Chrome extension
  • Language selection

prepost seo plagiarism checker

Having the extension installed in Google, means that you will no longer have to manually enter text in the box or upload a file, which is quite handy.

All you would need to do is install the extension, select text, right click on it and then click on “Check Plagiarism of Selected Text”.

If you still wish to do things manually, then here is what you need to do:

  • Copy and paste the text into the box
  • Click on “Check Plagiarism” –> Page will scroll down to results
  • View or download report

Plagiarism results, matched sources and document view features are available just like in the Small SEO Tools – Plagiarism Checker. However, this tool also offers 2 additional handy ones:

  • Grammar Results: Check if any grammar errors are present in your text
  • Readability: View tons of statistics, such as unique words, keyword density and flesh readability

prepost seo plagiarism checker

Conclusion: Checking plagiarism should become a habit!

There are many things that can help you make Google be your friend and one of these is certainly checking plagiarism.

Setting 5 minutes aside for each article you write, won’t take much of your time and it will also be worth it in the long run.

Do you want to know what else can make Google love you?

Read this article How to Improve Ranking in Google and try to follow a structured routine, whenever you write new content, including both checking for plagiarism and following the steps mentioned in the article above.

Which one of the above tools do you think is the best free plagiarism checker? Do you have other suggestions? Feel free to leave a comment below and let me know 🙂

14 thoughts on “Best Free Plagiarism Checker: 3 Tools to Use in 2019”

  1. Dear Cristina,

    Thanks a lot for the helpful and informative post. I got great insights from your post.

    Being a full-time blogger this post means a lot to me. At the moment I am focusing on organic traffic so I need to produce a lot more quality content and as the next step in my blogging business growth I am planning to outsource my content writing and your recommended three free plagiarism checkers will be certainly a great help to check the content I receive from the content writer.

    The video you embedded is very helpful and Thanks for sharing!

    Much Success!


    • Hi Paul,

      A few weeks ago I read about someone who outsourced their content and ended up receiving plagiarised articles.

      So yes, checking for plagiarism will definitely help you know who the reliable writers are 🙂


  2. Hello Christina,

    I know plagiarism is a practice Google friend at. However, I’ve not been able to find softwares to help me screen by blog post for accidental plagiarism. So, I must thank you for taking out time to write this blog post on free plagiarism software checkers. I’ll try the small SEO tools plagiarism checker, to make sure my post is free from plagiarism. If I want to check more than 1000 words, I’ll have to use a paid plagiarism checker, right? Hoping to hear from you soon, warm regards

  3. Thanks for sharing this informative and educative information.Actually many site fall victim pliagarism either accidentally and end up being penalized by Google. I’m into online business and avoiding this is really a great task but reading this has made it do simple by using the checker. Thanks for bringing this to my notice. 

    • Unfortunately, many people try to avoid working hard by taking shortcuts and plagiarism is one of these…

      Google finds out soon or later, so it is always best to work the honest way 🙂

  4. Thanks for writing this post I find it so useful because am about to write my first content for my blog.

    For like few days now I have been putting all my ideas into writing my first blog post.i don’t have it in mind or know how important it is for me to run my contents for my blog post through plagiarism checker in other to check for the quality of the content.i have note all the rules that plagiarism in this article and I will make use of plagiarism detector to check all I have wrote before posting it on my blog 

  5. Hi Cristina,

    Thank you for writing a great informative article about best free plagiarism checker in 2019. After reading your article I have found that this article will be helpful for all beginners who want to rank their site in Google. I have personally used small SEO tools and I think this is the best free plagiarism checker tool. However, I have not checked the plagiarism doctor yet. I am going to check that one also. I am expecting more helpful article from you and going to save this in bookmark section.

    • Thank you 🙂

      Let me know how you find the other tools. I personally like tool #3 as it has the most amount of useful features!


  6. Thank you, Cristina, for sharing this article on free plagiarism checkers. Plagiarise will get you kicked off some search engines or hurt your (SEO) Search Engine Optimization. It’s always best to be original when writing.>>The more a person practices their writing the better of an author they will become.>>I never thought about plagiarism against myself. Excellent idea – to check my own work. This way I’m making sure to produce new concepts.>>It looks like all of the checkers share a common value, limit of 1000 words. I have used Small SEO Tools in the past. I am going back to using on all my work.>>I have booked marked your site because your writing is easy to follow. I can relate to a lot of what you are talking about. I have looked other pages here on your website and I’m sure you can help me with a lot of writing ideas. Thank you, Cristina.

    • Hi Lenard,

      Yes, the limit is 1000 but if your article is 3000 words long, then you can perform 3 checks, one for each 1000 words 🙂

      All the best,


  7. What an informative post! Thanks for revealing some collection of best online plagiarism checker tools that can reduce the chance to duplicate content issue to a great extent. In this post, 3 online plagiarism checkers tools that will help us to find out the red flags to avoid the duplicate content issue is reviewed in which I do like the first two, as it allows us to perform a 1000 words search by either manually entering the text, uploading a document, entering a website’s URL or choosing a file from the cloud. This post really enlightened me, as I remember I had engaged in Accidental Plagiarism before, unknowingly. To be sincere checking plagiarism should become a habit in us, as an internet user, especially bloggers and writers as it makes our work unique.

  8. Some time last year when I was working as a curator for a cryptocurrency social media platform called steemit. I came across various forms of plagiarism especially direct plagiarism, self-plagiarism and patchwork plagiarism. I had to go through a lot to filter out exceptional and original contents, submit it to a team of veteran curators who also screen the post before rewarding the author. 

    I had to alternate between free and paid plagiarism checkers to be sure of zero-plagiarism in a post before passing it to the team.  To be frank, plagiarism is not a good practice, bloggers should really be mindful of this as it has a way of ruining one’s reputation 

    • Hi Sammy,

      Wow, that must have been painful but I guess these situations really teach us a lot!

      Plagiarism is definitely something that should be avoided. Originality is a must!


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