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.

Debug "unexpected output" During Plugin Activation


This developer plugin allows for easy debugging of those ambiguous “The plugin generated ### characters of unexpected output during activation. If you notice “headers already sent” messages, problems with syndication feeds or other issues, try deactivating or removing this plugin.” Hope it helps you solve your headaches!


Install this plugin and then activate your plugin you are trying to debug.



November 15, 2018
This plugin is a *must* when developing a plugin in order to debug those "unexpected output" error messages. Thanks! Joe
January 29, 2018
Despite not being updated, this plugin still works fantastic. I had a Class that was returning extra characters and no matter what debugging I tried, couldn't get the output. Installed this plugin and BOOM! Got the errors that were giving me extra output. Thanks!
September 16, 2017
This plugin saved me a lot of time while developing my own plugins. Thank you
September 3, 2016
Thanks a million mate! How can you solve where 2 million extra characters are coming from without a plugin like this one?? Helps you see what's going on in order to remove those annoying bugs!
Read all 39 reviews

Contributors & Developers

“Debug "unexpected output" During Plugin Activation” is open source software. The following people have contributed to this plugin.