The Copyscape Premium plugin lets you check if a WordPress post is unique before it's published, by searching for duplicate content on the web.
As of April 2026, Copyscape Premium is a WordPress unique plugin with 1.0K+ active installations and a 3.2/5 rating from 10 reviews. It has been downloaded 53K+ times in total. Requires WordPress 3.0.1+ and PHP false+. Available on WordPress.org since 2013. Downloads are up 32% this week. Top alternative: Advanced Custom Fields: Unique ID Field.
The Copyscape Premium plugin lets you check if a WordPress post is original before it’s published, by using the Copyscape Premium API to check for duplicate content on the web.
The plugin will add a ‘Copyscape Check’ button to your WordPress interface, allowing you to check your posts whenever you wish. You may also set the plugin to automatically check your posts when you click ‘Publish’ and/or ‘Update’.
When duplicate content is found, a report of matching pages is shown. You may also see a detailed comparison that highlights your content on the found page.
If you do not already have a Copyscape Premium account, please sign up, purchase some credits, and enable your API access. You may then begin using the plugin.
The plugin is not working. I paid for the service, checked all the settings. After pressing the check button, the page is updated, but nothing changes, and the limits are not written off.
I’ve spent 15$ to get hundreds of matches for… cookie consent pop-up. What a BS.
I personally installed the plugin in my site to detect plagiarised content that i did not notice before. and well just for 10$ I got almost unlimited credits to check for it on product and posts pages. The tool is perfect detecting spam. The only thing is that it also autodectects the same website content as duplicate. And also after saving Twice, The plugin conflicts a little with wpml plugin and changes the language of the post which damages the page. Though i need the plugin and still works. I hope others check this great tool to fight the latest google spam updates more easily. and I hope the author can do a great update for this great plugin!!!!
You need to register and pay for the API, no complain, this is clearly said before even installing, so all good here (user complaining on that is unfair)
The plugin is very easy to install and use
Admin and user setting are very good
Many options to check plagia when user want … but it is pushing to sell more 😉 … and that can cost very quicly several dollars per articles if you don’t pay (pun intended) attention
So please, copyscape team:
– optional: by defaut, deactivate all automatic checks. Users may select them back
– nice to have: do indicate the remaining credit on the account in the post edit page
– a must: do indicate how much credits it will cost to check, BEFORE CHECKING
A must plugin for serious writer
| WordPress | 3.0.1+ requiredTested up to 6.9.4 |
| PHP | false+ required |
First released version.
Plugin data sourced from WordPress.org. Analysis and metrics by PluginSift.