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Web address
Commercial? Yes
Type of site
Plagiarism search
Registration Optional
Available in Multilingual
Owner Indigo Stream Technologies
Launched July 10, 2004 (2004-07-10)
Revenue From premium services
Alexa rank
Decrease 2,412 (July 2015)[1]
Current status Active

Copyscape is an online plagiarism detection service that checks whether similar text content appears elsewhere on the web.[2] It was launched in 2004 by Indigo Stream Technologies, Ltd.

Copyscape is used by content owners to detect cases of "content theft", in which content is copied without permission from one site to another.[3] It is also used by content publishers to detect cases of content fraud, in which old content is repackaged and sold as new original content.


Given the URL or text of the original content, Copyscape returns a list of web pages that contain similar text to all or parts of this content.[4] It also shows the matching text highlighted on the found web page. Copyscape banners can be placed on a web page to warn potential plagiarists not to steal content.

Copyscape also provides two paid services: Copysentry monitors the web and sends notifications by email when new copies are found, and Copyscape Premium verifies the originality of content purchased by online content publishers.

Design and independent evaluation[edit]

Copyscape uses the Google Web API to power its searches.[5] Copyscape uses a set of algorithms to identify copied content that has been modified from its original form.

Reported use in plagiarism cases[edit]

Copyscape's use has been reported in cases involving online plagiarism:


Copyscape was launched in 2004 by Indigo Stream Technologies, Ltd., co-founded in 2003 by Gideon Greenspan.[12]


  1. ^ " Site Info". Alexa Internet. Retrieved 2015-07-15. 
  2. ^ Steal this post, Elinor Mills, USA Today (Washington DC), February 8, 2007
  3. ^ Online plagiarism strikes blog world, Maura Welch, Boston Globe, May 8, 2006
  4. ^ Scanning for Scammers Before You Buy In, Karen E. Klein, BusinessWeek (New York), March 3, 2008
  5. ^ Copyright Tool Will Scan Web For Violations, Kevin J. Delaney, The Wall Street Journal (New York), December 18, 2006
  6. ^ Brayton Purcell Llp v. Recordon & Recordon, 361 F.Supp.2d 1135 (N.D. Cal., 2005)
  7. ^ Apple accused of copyright wrongs, Paul Festa, CNET News, April 11, 2005
  8. ^ Apple and copyright violations, Arve Bersvendsen, April 6, 2005
  9. ^ Deborah Hill Cone (October 27, 2005). "A new maxim for Maxim — don't plagiarise". National Business Review. Retrieved September 26, 2011. 
  10. ^ Copyscape, Richard Stiennon, ZDNET blog, December 9, 2005
  11. ^ 9th Circuit Finds for PI Firm Over Theft of Firm's Web Site Content, Petra Pasternak, The Recorder, August 6, 2009
  12. ^ Gideon Greenspan

External links[edit]