Plagiarism: Crot Plagiarism Checker

Maintained by Picture of Sergey Butakov Sergey Butakov
This FREE plugin is aimed at digital plagiarism detection: it uncovers assignments copied from peers at the same institution. The module is language independent. Maintainer: Sergey Butakov More information:
71 sites
7 fans
Moodle 2.0, 2.1, 2.2

Block is based on document fingerprinting technologies for pair-wise document comparison.

Please note that as of August 01, 2012 the block does not perform global / Internet search due to monetization of Bing search engine API.


A distinctive feature of this plug-in is that all local checkups are happening on your Moodle server without sending any documents outside. Thus, in contrast to other available solutions, the plug-in does not impose any issues related to student intellectual property protection. 


This module is the successor of  Crot for Moodle block: This version is tailored for the plagiarism API in Moodle 2.x.

This is standalone module that doesn't require a connection to the external plagiarism detection service. 

Maintainers: Sergey Butakov, Svetlana Kim

More information:


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Picture of Sergey Butakov
Sergey Butakov (Lead maintainer)
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  • Picture of Mikael Wazikov
    Wed, 28 Oct 2015, 10:50 PM
    I'm trying to choose between Crot and Unplag Plagiarism plugin for Moodle. Does Crot use only Bing search engine? On is said that Unplag checks against Google and Yahoo.
  • Picture of Mariya Kulygina
    Mon, 16 Nov 2015, 6:19 PM
    Will this plugin work for the workshops, or is it made only for assignments?
  • Picture of Farhat Ali
    Wed, 18 May 2016, 5:29 PM
    Thank you for contribution. I've some problem when I created an account key is not displaying.

    Farhat Ali
  • Picture of Claite Wilson
    Mon, 31 Oct 2016, 6:15 PM
    a great plugin...which combined with essay samples would make it easier for any student write plagiarism free, original essays
  • Ricardo Caiado
    Mon, 20 Feb 2017, 8:27 PM

    Is there any chance of this plugin being upgraded to Moodle version 3.2?

  • Picture of Janey Crosby
    Tue, 25 Apr 2017, 3:59 PM
    Wow, I've never heard about this tool. I personally use this plagiarism checker because it accepts all text formats. I'll try the suggested one smile
  • Picture of reginald surict
    Thu, 19 Oct 2017, 6:02 PM
    Cool. That's exactly what I need as I plan to order paper from and I am interested in having my paper unique and plagiarism free.
  • Picture of Krisha Moeller
    Sat, 2 Dec 2017, 3:41 AM
    I'm trying to install this plugin, but I keep getting the following error message:

    Validating plagiarism_crot ... Error
    [Error] Plugin does not declare its component name [null]
    Installation aborted due to validation failure

    What should I do? Thank you for your help!
  • Picture of Rayn Podolskiy
    Wed, 27 Dec 2017, 8:55 PM
    thanks, it will help me check out one essay writing service uk, where I often make orders
  • Picture of Darryl Wood
    Tue, 30 Jan 2018, 6:20 PM
    Thanks a lot for this great tool. Now I can check my student's narrative essays for plagiarism. I hope you still support this project.
  • Ricardo Caiado
    Sun, 18 Mar 2018, 4:40 AM
    Any updates do Moodle 3.4?

  • Picture of pkb 123
    Sat, 31 Mar 2018, 10:21 PM
    The first is aesthetic completeness. Just like you shouldn’t watch a foreign film without subtitles, you shouldn’t listen to music with words without knowing what they are. Of course, this is crucial for critics – one should not pass judgment on something without perceiving it in its entirety. But since everyone’s a critic now, and reading music critics is a great way not to enjoy music, this priority is just as important for listeners. If a band presents extra-musical information along with its music, like artwork and lyrics, those things inextricably become part of the package. I know Kill ‘Em All not as a pile of MP3s, but as sounds branded with a powerful album cover and lyrics of which the printed font is seared into my consciousness. Anything less, and I can’t claim to understand Kill ‘Em All.

    In metal, I often hear these counter-arguments: “the vocals are just another instrument or texture” or “the music is really what’s important”. Well, vocals are always another instrument and texture. Lyrics, when presented in a rhythmic and sometimes melodic manner, are part of the music. If you’re a metal band with a singer, you can’t say that the guy you drag along on tour and put in the center of the stage doesn’t matter. He’s the center of attention – so what comes out of his mouth is important. It’s not enough just to sound good. Let’s say that you go on a date, and the other person is dressed to the nines. That may seem attractive until you find out that the mind isn’t as sharp as the looks. You shouldn’t date dumb people, and you shouldn’t listen to dumb bands.

    Dumb lyrics often get a free pass because of the underlying music. Ideally, both parts are good. Hip-hop faces this problem often. The radio is riddled with “great beats, awful MC” (hello, Fabolous). And, to be honest, I can put up with that more than “awful beats, great MC” (hello, Nas). But the pleasures of “great beats, awful MC” are temporary. What lasts longest and means the most is “great beats, great MC”. This applies to all music with vocals. The best things in life are great total packages – and the best things in life should be the only things we seek.

    The second way in which lyrics matter is political, strange as that may sound. We live in an age of overload of both information and disinformation. We are told more things than ever, and they mean less than ever. When we watch TV adverts, and some rapid-fire voice machine-guns out a legal disclaimer at the end, we hear the letter but not the spirit of laws that are meant to protect consumers. Every time we see a news story, other stories could have been presented. Omission is an editorial and political act. It happens every second. Interests big and small use omission to keep people from knowing everything – and knowledge is power.

    So we should not volunteer to be ignorant in music, which, if you’re reading this, is probably important to you. Music feeds the soul. It saves lives. It is a source of power. It should be the last place where people don’t have the full picture. Listening to music without knowing the lyrics is like eating food without knowing its ingredients. It’s irresponsible. If music is important to you, take the time to embrace it fully. Know what that guy screaming at you is saying. In real life, you would damn well make sure to know.
    Lyricsbaby names
  • Picture of Vivek Kumar
    Mon, 30 Apr 2018, 2:11 AM
    Thank you so much.
  • Picture of Megan MArtin
    Mon, 28 May 2018, 1:14 PM
    We have a writing consultancy team for Assignment Writing Service and need to check plagiarism daily basis we used Crot Plagiarism Checker plugin easy to use or help to detect duplicate content finest.
  • Picture of Ana Rose
    Mon, 4 Jun 2018, 9:44 PM
    I am downloading this Crot Plagiarism Checker extension but I can't able to do it. I need this checker tool to check my website St Louis M0. Process Server in which some description present and I guess it is plagiarized but one time I want to check this with your provided tool.
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