Plagiarism checkers can help you find out whether your content has been copied by someone else. The followings are several free online plagiarism checkers which can be used to detect duplicate content on the internet.
Plagiarism Pro
http://plagiarism.pro/
It can search both text and website copies. No registration is required. I tested it and it worked for me.
Doc Cop
http://www.doccop.com
It has both “file check” and “web check” functions. If you want to use it, you have to register with your email address. But it is free. It looks good. I will give it a try.
Plagiarism Detect
http://www.plagiarismdetect.com
They have both Demo and Paid version. The demo version is free but it comes only with limited functions. The paid version will cost you $4.95, but it comes with many advanced features. Both versions need registration.
See Sources
http://www.plagscan.com/seesources/
The “analyze text” function is free to use and no registration is required. They also offer a paid version professional tool at http://www.plagscan.com/.
Glatt Plagiarism Self-Detection Program
http://www.plagiarism.com/self.detect.htm
To use this self-detect tool, you need to put in your name and email.
Duplichecker
http://www.duplichecker.com/
This free online plagiarism checker allows you to check with your text or an uploaded .txt file. Users can choose from Google, yahoo and Bing. It also has “advance” and “classic” options.
Plagiarism Checker
http://www.plagiarismchecker.com/
You can use this free plagiarism checker to check documents, web-pages or text. It is free and you don’t need to register to use it. You can search with Google or Yahoo. If you like, you can create google alerts or set your own preferences.
Article Checker
http://www.articlechecker.com/
I have used this one before. It is very simple and straightforward. No registration is necessary.
Plagium
http://www.plagium.com/
It has a character number limitation: up to 25,000 characters. You can choose to run a quick search or a deep search. You can set the search options.
Crossrefme
http://www.crossrefme.net/
It is just another simple free online plagiarism detection tool. Now it is in Alpha.
Copyscape
http://www.copyscape.com/
Copyscape can help you to check the duplicate content of your web-page online. It has both paid and free version. With the free version, you can only use it for limited times within certain period.
Copyright Spot
http://copyrightspot.com/
Copyright Spot is a website similar to Copyscape, which can help you to find out who has copied your web content.
FairShare
http://www.fairshare.cc/
FairShare is another website similar to Copyscape and Copyright Spot.
CopyGator
http://www.copygator.com/
CopyGator is very similar to Copyscape.
http://www.percentdupe.com/
Percentdupe is still in beta version. They claim that the software can help you find out how many percentage of your text content is copied by other people.
https://www.ipd.uni-karlsruhe.de/jplag/
Jplag is for detecting software plagiarism. You can use Jplag for free but they ask you to register an account on the site first.
http://www.noodletools.com/
They provide a lot of useful tools for your search need in the teacher resources section.
http://www.plagiarism.phys.virginia.edu/home.html
This is a plagiarism resource site which provides a windows-based plagiarism software, called Wcopyfind.
http://www.academicplagiarism.com/
To use the checker provided on academicplagiarism.com, you have to sign up first. They have both free and premium memberships. You can make a choice based on what you need.
http://www.plagiarized.org/
Plagiarized.org is providing a simple plagiarism detection tool. The good thing about it is that you can use it without regsitration or sign in.
http://www.checkforplagiarism.net/
The webiste offers paid plagiarism checking services.It is for serious users.They have multiple types of package for people to choose from.
http://plagiarisma.net/
Plagiarisma is another free web-based software for checking duplicate content on the web.It supports multiple languages.
http://searchenginereports.net/articlecheck.aspx
This site is offering a free web-based Plagiarism Checker. The good thing is that you don't need to register an account to use it.
http://www.dustball.com/cs/plagiarism.checker/
This is their basic version. They also offer a premium version which may give you better results. The basic version is free, but the premium version is not free. If you want to use the premium one, you have to pay a monthly fee which is $8 per month.
CopyCatch
www.copycatchgold.com
If you need advanced document search and analysis, you may take a look of this one.
TurnItIn
www.turnitin.com
It is another website to help you evaluate written works.Is it free? Maybe not.
MyDropBox
www.mydropbox.com
It is a tool to help your protect the originality of your work.
Eve
www.canexus.com
The EVE Plagiarism Detection System is not free. If you want to use it, you have to $29.99. But it is one time fee.
www.ZeidmanConsulting.com/CodeSuite.htm
Again, it is not free.It may be for serious users only.
I hope you will find the free online plagiarism checkers that you need.
