This plugin hasn’t been tested with the latest 3 major releases of WordPress. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress.

RedPen WordPress plugin


RedPen is a proofreading tool to help writers or programmers who write technical documents or manuals that need to adhere to a writing standard. This plugin integrates text validation provided by RedPen Server into the WordPress editor.


  • Validates text with RedPen as you type
  • Supports both Visual and Text WordPress editors
  • Validation errors are marked in Visual editor in-place
  • Validation error messages are also listed below and highlighted in the editor on click
  • Autodetection of supported languages and variants (currently, English or Japanese)
  • RedPen validators and symbols
    can be configured directly in WordPress panel below the editor
  • Configuration is stored for next visit with the same browser


  • Here's a screenshot of it in action

  • RedPen configuration can be easily tuned.


By default, the plugin uses public RedPen installation at for validation. See below if you want to use your own installation of RedPen Server.

  • The plugin is available in WordPress Plugin Directory, so you can install it directly form there.
  • Or you can download and upload it on the WordPress Plugins page. Alternatively, extract the zip file to WordPress subdirectory /wp-content/plugins/.
  • Activate the plugin in WordPress Admin console -> Plugins -> Installed plugins.

Using an own instance of RedPen Server

If you are uncomfortable sending your text for validation to an external server, you can use your own instance.

To use the plugin, you need to have RedPen Server v1.4.5 or newer. Please refer to RedPen Server documentation for more details on how to start it.

By default, local RedPen Server will respond at http://localhost:8080/. Make sure that it is accessible from your client machine (browser), possibly opening its port (8080) on the firewall.

Then, go to WordPress Settings -> Writing and define a new RenPen Server URL.


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Contributors & Developers

“RedPen WordPress plugin” is open source software. The following people have contributed to this plugin.




  • Fixed js error on first usage of RedPen Plugin


  • Add support for custom post types


  • Add support for Multisite installation


  • More secure proxy-less communication with RedPen Server (1.4.5 or newer)
  • RedPen Server’s URL can be configured in WordPress Settings


  • Added in-place highlighting and RedPen configuration
  • Use public RedPen Server installation by default for ease of installation


  • Initial version