Good question Khalid.

Although a plethora of plagiarism detectors are available online as u mentioned, It seems daunting for a researcher to select the best among them. As far as I know the following tools are more popular

1) Ithenticate: it is commercial software being used by most of the publishers like Elsevier, Springer, Wiley etc etc..

http://www.ithenticate.com/products/plagiarism-checker-for-authors-and-researchers/

2)Plagscan: This is a commercial one but free trial is also available.

http://www.plagscan.com/

3) Grammarly, which is an online paid software but it is also available for free trial (15days).

http://www.grammarly.com/?q=plagiarism&gclid=COvt2O6i6rMCFQYb6wodJCUA9w

All d best :-)

http://www.grammarly.com/?q=plagiarism&gclid=CJ7q6uui6rMCFUQw4AodwSoA2w

Good question Khalid.

Although a plethora of plagiarism detectors are available online as u mentioned, It seems daunting for a researcher to select the best among them. As far as I know the following tools are more popular

1) Ithenticate: it is commercial software being used by most of the publishers like Elsevier, Springer, Wiley etc etc..

http://www.ithenticate.com/products/plagiarism-checker-for-authors-and-researchers/

2)Plagscan: This is a commercial one but free trial is also available.

http://www.plagscan.com/

3) Grammarly, which is an online paid software but it is also available for free trial (15days).

http://www.grammarly.com/?q=plagiarism&gclid=COvt2O6i6rMCFQYb6wodJCUA9w

All d best :-)

It was really good thing to know. I tried Plagscan but it says Insufficient PlagPoint credit to execute analysis!. Is it that we have to invite many people to join this to increase plag point before we can use this for our file.

That is d major problem in online software. U hav to go through many time consuming online activities to get free access. Better u can try grammarly.

Turnitin

Make sure you clear the pasted document because some of the application, it save our pasted document. So, unfortunately, it considered as plagiarism...

Viper is also a powerful tool which helps in finding out the plag contents!!

Thanks

Viper needs Microsoft Net Frame work 4.0 prior to the installation of Viper.. It is free to use, and a good tool for this purpose...

Dear Khalid as we know we have Anti-plagiarism software called "Turnitin"

I think iThenticate is most widely used by researchers because it has the greatest amount of scholarly and STM published and non-published content to search against. Correct me if you feel otherwise! iThenticate generates a similarity score, shows sources and is very accurate (request a free trial and be the judge). It uses the same databases as Turnitin, but you only get access if your university has a license for your research department. Otherwise, iThenticate offers an online self-serve option. Good luck!

One more and a genuine anti-plagiarism checker is docoloc. You can try here: http://www.docoloc.de/

Try smallseotools.com/plagiarism-checker/

it produces mid level accuracy!!

Viper and ithenticate

you can use Viper Plagiarism Scanner, its free.

Thanx rupam.. Viper is good.. i downloaded and signed up.. Its superb!!

http://www.scanmyessay.com/viper/Release/ViperSetup.exe

Hi all, I use Viper but am not sure how exact it is. Anyhow there are lots of other software for this purpose but most of them are not free, think Viper is the only free one, the others prove to have a free trial version, but actually ask for your credit card info, which is the same problematic parts we have.

Hi , I used the Turnitin software , but it is not free of charge. So you can use the dustball software which it is free plagiarism detector . http://www.dustball.com/cs/plagiarism.checker/

Regards

Dear Khalid, If you want a free plagiarism detector, I suggest the following one. It checks all the on-line books and articles. You can even check paragraph by paragraph.

http://plagiarismdetector.net/

Hi Khalid, till now I used only duplicheker. You need to sign up to avail free use. I think you can rely on it.

http://www.duplichecker.com

http://smallseotools.com/plagiarism-checker/

Sir,

Please check the above hyperlink.

Dear All,

Thank you so much for your valuable comments. I would like to convey you that our university (Jamia Millia Islamia, New Delhi) took 100 user licence from http://www.turnitin.com, which is like a plagiarism detector. I am using it from the last 3 months but as far as my experience is concerned, it is not much powerful.

I think http://www.turnitin.com was more used at high/middle school. And now they are trying to achieve universities. So maybe it will take a while to have the system working well with scientific high level papers.

I think Viper is pretty good for researchers.

Duplichecker is also a good option.

It is better to compile in a plagiarism free manner, and if plagiarism met - then follow condensing and re-phrasing of that part, plus some more additions / updations in own's language. Freely available plagiarism checkers are not much reliable, you can go for few paid ones online.

First of all plagiarism is a sin and is strictly objectionable. So my suggestion will be not to commit it. Beyond that still if it prevails you can check it though few paid plagiarism tools.

I have created my own collusion and plagiarism detection tool that does not retain your material, please try http://www.doccop.com

You can use freely the following link as well.

http://www.plagiarismsoftware.net/

what about turnitin? Is it okay?

You can use the software Plagiarism Checker. But it is not a freeware. It costs up to $35.

The best and freely available software for plagiarism detection is Viper. I use it frequently. It  satisfied me. You can download it from following web page: 

http://www.scanmyessay.com/

Some of the free plagiarism checking tools one can use free of cost are given below.

1. Anti-Plagiarism is a software designed to effectively detect and thereby prevent plagiarism. We can check documents for plagiarism using MS Word/pdf formats.

2. DupliChecker is a tool, one can use for detecting plagiarism online completely free of cost. It is very much user friendly too.

3. Viper is a fast plagiarism detection tool which can scan to scan free the document and offer side-by-side comparisons for plagiarism.

try this one as a demo:

http://plagiarismcheckerx.com/download.php

every time you can check plagiarism in limited word (150 words) in demo version.

But If you feel satisfied then you can by it by less then 50 $

good luck!

I tried Grammerly: very good

Now, I use Viper, I am satisfied

good luck

In my opinion viper is good software which offer fast and reliable results...

Is there any risk of leak of information before publication with viper software.

with my modest knowledge, no cases have been reported

When using Viper, which category one must select to check plagiarism in manuscrit related to dentistry.

Dear Gurudutt Nayak  while using viper for dentistry you can chose any of the following category depend on nature of your manuscript 1.biology 2.Beauty therapy 3. health or any other which you feel that work is associated with that field..

Thank you Rohit.

Khalid you can check this one which is completely free once you sign up. ..

http://www.duplichecker.com/

I have downloaded Viber but it  is required username and passowrd ?

Yes.Its registration is free.The Viper is the best free plagiarism checker.

Is there any free Anti-Plagiarism Software available?

Thank you Dear Khaled Saad

Don't use Viper they post your paper on an essay mill site.

https://www.plagiarismtoday.com/2013/11/18/viper-plagiarism-scanner-stealing-essays/

Dear Danielle A. Allessio

Thank you for the information. 

Thank you for this information. You are blessed in Jesus name

thank you for this information.

Hello Khaled,

There's no any free service at all up to this time, but there's a proper website which is founded and managed by Turnitin systems, this website offers a paid service, it offers a reasonable prices, I think it is better to have a look about it.

Regards.

One can use some available software for that

Try eTBLAST

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1933238/

I hope the plagiarism software like ithenticate, plagscan, Gramarly, etc are made freely accessible software so that every researcher can check for plagiarism before submission.

Hi. I have tried Viper, but it is not finding any plagiarism in any of my documents. Can you please suggest me how to operate it? 

Dear all,

Most of free plagiarism detectors software are not work perfectly because they allow high number of word similarities. They cached only 100 % similarity in the open searcher engine documents. I used

http://smallseotools.com/plagiarism-checker/

Now I used TRUNITIN which it is very well but it is need an a membership..

regards

Well TurnItIn is quite good, I just feel that it kind of overtly matches words by doing too much of similarity check (I mean word-for-word)! The percentage plagiarism get to reduce as soon as you endeavour to re-frame your lines, though. Overall, I think it is good, but the 'reviewer' must know what to pass and what to reject while using the application!

Plagiarism checker X is good and cheap. http://plagiarismcheckerx.com

Really I tried to use it but it does not work correctly.

I think that https://www.plagscan.com/

is the best and free

ithenticate is good and I think we need to explain to our students the value of such software in their study and future work .

A very simple method I use sometimes is to copy-paste suspicious sentences of a paper in Google or google scholar. If there is a complete plagiarism, it will find the document and the source. Anyway, the source should be free available on internet.

http://www.urkund.com/en/student

https://www.grammarly.com/plagiarism

https://www.plagscan.com 

this site will check for free only one document (2000 words max) but you need to buy credit to check more documents. but its a good one to check plagiarism.

wonderful discussion. Happy to read.

please i need a free plagiarism checker software

You can download VIPER. Its free and really effective for checking plagiarism

Viper is not working on my PC now.

Have you tried Turnitin? Good one.

what is ithenticate?

Ithenticate is good software but we need to buy at a high cost. As such, students can't afford the software.

Thank you all

Sir, please note that ignorance is a killer disease. Hence, no matter the cost of this sofware, my advice is that your students should go for it. If knowledge is expensive can we ever try ignorance? Nooooooooo! Please.

Hello dears researchers. I think the programs of check plagiarism free on internet need less count of words. so that i believe that the good program must be coasted and this can be introduced by institute of work

Thanks for all discussion 

There are really a lot of Plagiarism Detection Sofware nowadays. I usually use Noplag Plagiarism Checker – here is its website: https://noplag.com/  The Service allows to check each single phrase and sentence and see the source it will lead to. Free joining will allow you to check documents against the Web, but you also can sign up for professional version which let you to acan against the Web and database that contains more than 5 + Million academic papers to check against; 10+ Million publications; 1.3+ Billion pages on the Internet.

I think that it ids not free

https://noplag.com/

You can also try another free one: http://smallseotools.com/plagiarism-checker/

This site is free but it does not go deep in the plagiarism checking. I mean that there are many things that it does not include them in the checking.

http://smallseotools.com/plagiarism-checker/

https://noplag.com

http://www.scanmyessay.com/

http://www.duplichecker.com/

http://plagiarismcheckerx.com/

https://www.plagiarismsoftware.net/

http://www.dustball.com/cs/plagiarism.checker/

https://www.grammarly.com

http://smallseotools.com/plagiarism-checker/

http://www.dustball.com/cs/plagiarism.checker/

http://turnitin.com/

http://www.docoloc.de/

http://www.crossref.org/crosscheck/index.html

http://plagiarisma.net/

http://www.ithenticate.com/

http://www.paperrater.com/free_paper_grader#

http://www.duplichecker.com/index.php

http://www.shambles.net/pages/staff/ptools/

See the following links, please.

https://elearningindustry.com/top-10-free-plagiarism-detection-tools-for-teachers

http://www.plagscan.com/plagiarism-check/

Plagtracker for FREEMIUM http://alternativeto.net/software/turnitin/?license=free UNPLAG FOR COMMERCIAL (based on alternativeto.net popularity) Unfortunately we lack a reliable & 100% OpenSource

ALSO CHECK THIS TEXT ADDED TO SIMILAR AND PREVIOUS/RECENTS SIMILAR ANSWERS ON RG, there you fill find a huge plethora of options.  Being the best list of all the top 10 https://elearningindustry.com/top-10-free-plagiarism-detection-tools-for-teacher and the 26 TESTED EFFICACY http://plagiat.htw-berlin.de/software-en/2010-2/.  My academic institution uses Turnitin so it must count as a reference, so check for the one used at your institution library!! they must or can grant you access if you're teacher...

(THIS my-text tries to summarize a revision to the six RG question)  I haven't used plagiarism cheking software, but the provided answer are based on concise and popular users who insistently tried to persuade us NOT USING VIPER, because suspiciously they sells the provided docs for revision)

I tried the Turnitin software. Try it , it reliable for this purpose

Also u can try Ithenticate. It is very good and reliable 

 please who have plagiarism software or a good site for free download?   

Really very useful and  thanks to everyone and thanks for your contribution 

Though there are various plagscan, but if you have written by your own, then there should not have to go for any software

Please colleagues, visit and check the following link:

Regards, Emad

https://veriguide4.cse.cuhk.edu.hk/vg_report/app/report_error.jsp

Could anyone help me to check my doc by using iTheticate if you have? TIA

hi everybody, searching for a good  free software wich can be detect a plagiarisme

http://www.checktext.org

The following links allow you to check the plagiarism rate in a manuscript:

1- http://plagiarisma.net/fr/#

2- https://www.scanmyessay.com/

3- https://onhax.me/plagiarism-checker-x-5-1-4-pro-crack-is-he…

4- https://www.plagscan.com/analyse-de-plagiat/

5- http://smallseotools.com/plagiarism-checker/

6- http://www.plagtracker.com/

7- https://www.duplichecker.com/

8- http://www.plagium.com/fr/detecteurdeplagiat

9- https://www.paperrater.com/plagiarism_checker

10- http://solidseotools.com/plagiarism-checker

11- https://copyleaks.com/

12- http://www.plagiarismchecker.com/

13- http://www.quetext.com/

14- http://plagiarismdetector.net/

15- http://www.dustball.com/cs/plagiarism.checker/

16- http://www.articlechecker.com/

17- https://plagiarismcheck.org/

I think, free check  for the plagiarism can't covers all publications .It covers only  open access publications.

Despite we cited our own text that was published are still catagorized into plagiarism, Thus we must create new sentences to avoid plagiarism, although the meaning is similar.

I think that the problem, in most of the free programs, is that does not make deep plagiarism.