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What, Why, and How-To’s of Creating a Site-Specific WordPress Plugin

Do you want to add a site-specific plugin to your WordPress website? A site-specific plugin allows you to easily add code snippets to your WordPress website without relying on your theme. In this article, we will explain how to create a site specific WordPress plugin and why it’s important.

Site Specific WordPress Plugin

What is a Site-Specific WordPress Plugin

A site-specific WordPress plugin is a standalone plugin that you can use to add all customization snippets that are not theme dependent.

When working on your website, you’ll often find WordPress tutorials asking you to add code to your theme’s functions.php file or a site-specific plugin.

WordPress doesn’t come with a site-specific plugin. You’ll need to create your own and then install / activate it.

Why Create a Site-Specific WordPress Plugin?

As we mentioned earlier that you’ll often come across tutorials showing some code that you can add to your theme’s functions.php file or a site-specific plugin.

These custom codes can be used to add new post types, taxonomies, shortcodes, and tons of hacks to improve your website.

If you add the custom code to your theme’s functions file, then it will disappear if you update or switch your theme. You can create a child theme and use the child theme’s functions file to save your code. However, your code will still disappear if you switch themes.

A site-specific WordPress plugin allows you to easily add custom code snippets to your WordPress website and make sure they’re theme independent. It is a standalone WordPress plugin which means it doesn’t depend on your theme, and you are free to update or switch your theme.

That being said, let’s take a look at how to easily add custom code using site-specific plugin. We will show you two ways to do that, and you can choose the method that works best for you (hint Method #2 is easier for beginners).

Method 1. Manually Create a Site-Specific WordPress Plugin

We know this may sound a bit geeky to beginners, but we will try to make it as simple as possible for you.

First you need to create a new folder on your desktop and name it after your website for example, mywebsite-plugin.

Creating your site-specific plugin folder

Now open a plain text editor on your computer like Notepad or TextEdit. You need to create a new file and save it as mywebsite-plugin.php in the plugin folder on your desktop.

Creating the plugin file for your site-specific plugin

Your plugin file needs specific header code so that WordPress can recognize it as a plugin. Go ahead and add the following code to your mywebsite-plugin.php file:

Plugin Name: Site Plugin for
Description: Site specific code changes for
/* Start Adding Functions Below this Line */
/* Stop Adding Functions Below this Line */

You can replace with your own domain name. Once you do that, your site-specific plugin is ready.

There are two ways to upload your site-specific plugin to your website. You can either upload it via your WordPress admin panel or use FTP.

1. Install Site-Specific Plugin from WordPress Admin Area

This method is easier and recommended for all users.

First, you need to create a zip file of your site-specific plugin folder.

Windows users can simply right-click on plugin folder and select Send to » Compressed (zip) folder.

Creating zip file in Windows

Mac users need to right-click and select “Compress mywebsite-plugin”.

Creating a zip folder on Mac

Once you have the plugin’s zip file, go to the Plugins » Add New page in your WordPress admin area and click on the ‘Upload Plugin’ button on the top.

upload plugin

Next, click on the choose file button to select the zip file you created earlier and then click on the ‘Install Now’ button.

WordPress will now upload and install the plugin for you. Once its uploaded, you need to click on the activate button to start using your site-specific plugin.

Activate plugin

2. Upload Your Site-Specific WordPress Plugin via FTP

For this method, you don’t need to create a zip file. You will be uploading the plugin via FTP.

First, you will need to connect to your website using a FTP client.

Once connected, go to /wp-content/plugins/ folder under remote site column. Next, you need to select your site-specific plugin folder and upload it to your website.

Uploading plugin via FTP

Your FTP client will now transfer your site-specific plugin folder to your WordPress website. This will install the plugin on your website.

However, you’ll still need to activate the plugin to start using it. You can do this by going to the ‘Plugins’ page inside your WordPress admin area and then click on the ‘Activate’ link below your site-specific plugin.

Activate plugin

That’s all. Your site-specific plugin is now ready to be used.

Adding Custom Code Snippets to Your Site-Specific Plugin

There are two ways to edit your plugin and add custom code snippets to it.

First method is to do it via WordPress admin area. You can go to Plugins » Editor page. You will see a warning message, and you need to click on ‘I understand’ button to continue.

Next, you need to select your site-specific plugin from the drop down menu labeled ‘Select plugin to edit’. The editor will load your plugin file, and you will be able to add code snippets in it.

Plugin editor

Once you are done, click on the ‘Update File’ button to save your changes.

If there is something missing in your code or it has potential to break your website, then the plugin editor will automatically undo your changes.

However, if the editor fails, and you see the white screen of death, then you can use FTP to edit your plugin file and undo those changes.

The second method is to directly edit the plugin file using FTP. Simply go to the plugin folder using your FTP client. Right click on the plugin file and then select View/Edit file.

Editing plugin file via FTP

You can also download the plugin file to your computer, edit it, and then upload it back.

Method 2. Using The Code Snippets Plugin

This method is a lot simpler and gives you a better way to manage your individual code snippets in WordPress.

First thing you need to do is install and activate the Code Snippets plugin on your website. For more details, see our step by step guide on how to install a WordPress plugin.

Upon activation, the plugin will add a new menu item labeled “Snippets” to your WordPress admin menu. This is where you will manage all your custom codes.

To add a custom code, you need to go to Snippets » All Snippets page and click on the ‘Add New’ button at the top.

Adding a new code snippet

This will bring you to the ‘Add New Snippet’ page.

First enter a title for your custom code snippet. This could be anything that helps you identify the code.

After that you can go ahead and paste your code snippet into the code box.

Adding custom code

You can also add a description for the code in the field below the code box. You should use this area to write down what this code does, where you found it, and why you are adding it to your website. This will help the “future you” remember why the “past you” added this code.

Add your code description

You also have the option to assign tags to your code snippets which can help organize code snippets by topic and functionality.

Finally, you can click on the ‘Save Changes and Activate’ button. If you just want to save the code snippet without activating it, then you can click on save changes button instead.

The plugin also allows you to select where you want to run the code snippet. You can choose from admin area, front-end, or everywhere options.

If you are unsure, then keep the default ‘everywhere’ option checked.

Once you have saved and activated a code snippet, it would become effective on your website.

For more details see our guide on how to easily add custom code snippets in WordPress.

We hope this article helped you learn why and how to create a site-specific WordPress plugin. You may also want to see our list of useful functions file tips and most wanted WordPress hacks to best use your site-specific plugin.

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119 CommentsLeave a Reply

  1. Is it possible to add code snippets like Google Analytics Code, Adsense code in Site Specific Pliugin. Or only possible to add codes we generally put in functions.php file.

    I mean, is it possible to add codes in site-specific plugin what we generally put in Header.php file.

    • You can do that if you would like, you can also use the insert headers and footers plugin.


  2. hi
    Thanks for this tuto
    however is there a way to make this plugging(not to be visible) not in plugging list and also in a specific folder (not wp-content folder) ?


    • Actually yes, there is:
      Instead of placing the plugin in …/wp-content/plugins/ you put it in …/wp-content/mu-plugins/ (You may have to create that directory, if it’s not there yet.

      Plugins that are placed in mu-plugins are ALWAYS run, so the only way to deactivate a MU plugin (MU currently is construed as “must use”) is to delete it (or remain the directly mu-plugins to something else…).

  3. Hi I tried to do the Site-specific plugin, but it is not working, I get this message “The package could not be installed. No valid plugins were found.

    Plugin installation failed.”
    What do I do?

    • Hi Judith,

      This usually means that the plugin header information is incorrect. You can try again and make sure that your plugin header is exactly in the format displayed in the tutorial.


      • I get this same error. I have tried maybe 10 times. Uploaded through admin and on FTP. Cannot get it to upload. I am using TextEditor to paste the code. Notice several things you don’t mention in the post that I wonder could be an issue. First, won’t let me save the file as .php. I have to save it as .php.rtf OR .rtf then go back and rename the file after it is saved.
        Second, not sure what you mean by making sure the format for the plugin header is exactly the same. Should the line number be in there? If so, I can’t get that to work. If I copy and paste with the line numbers, the green vertical line doesn’t show up and there is no space between the line numbers and the code. Or am I supposed to just copy the code (without the line numbers)? Either way, I’ve tried everything I can with my current Textedit application and it will not work.
        Any ideas? I can send you screen shots of exactly what I have if you would like

        • Hi Jonathan,

          You will need to save file as .php. Please use a different text editor on Windows you can use Notepad or download Notepad++. On Mac, you can use TextEdit or download and install TextWrangler.

          You don’t need to copy and paste line numbers.

        • In my case the issue was that the file had Unicode encoding. Changing it to ANSI fixed the issue.

  4. Hi,
    Good day!
    Would like to know how to set a white paper in my blog post article to download it with add email address from the visitor.
    Thanks, Ikram

  5. Great info! Thanks so much. I have been using WordPress for years and this little gem made it so much easier!

  6. I have edited some code in Style.css . Will it be overwritten if i update a theme?
    is it possible to create style css file in this site specific plugin?

  7. White screen on publishing pages.
    The code works to show child pages on a parent page using the shortcode however I am getting white screen. Anyone know why?

  8. The plugin generated 3 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.

  9. I believe best approach to add custom code to site is child theme. No matter if we need to customize theme or not. I mad a practice to always use child theme even if there is no customization. This habit saved my time & effort many times. I dont think it is good to create extra plugin for such customization.

    I believe in minimum use of plugin no matter how simple you created one.

  10. Which is better, site-specific plugin or Child Theme? or both?

    I need to create a custom post type to add some major functionality to my site so is the plugin better or the child theme and its functions.php?


    • The thing is, is that you’re creating the plug-in yourself, using the functions the same exact way. So the answer to your question would be that neither is better, because you should be using them WITH each other.

  11. How would I create a create a new plugin directory in Azure? I have WordPress running on Azure using MS SQL Server, which I activated using Project NAMI.

  12. not working on multisite with publisher theme can you help me this is my site and also tell me how can i remove featured image inside the post not from front page latest post

  13. Hi there,
    You WP Beginners are rock. and I want to thank you for your Struggles for us.
    Now come to the point. I have installed an theme and in that theme, there is an function that is showing wp toolbar for guests, I have tried so many times to find this function in theme files to remove this, but i can’t. So please help me to remove that toolbar, that is showing to every visitor with wordpress logo and wordpress’s own link to their website. Screen Shot is attached.

  14. Does something like this work for plugins too? Im finding that I am making a few changes to plugins that I add to my site….many times deleting certain lines of code I dont want. I’m assuming that after I update that plugin, all my changes will be erased. How can I avoid this?

  15. Hi, thanks for the post. I’m getting an error when I activate the plugin for some reason:

    Parse error: syntax error, unexpected ‘*’, expecting identifier (T_STRING) on line 9

    Any ideas what I’ve done wrong?


    • Hi Elizabeth,

      There is an unexpected asterisk sign in the code on line 9 which is blocking the php script. Edit the file again and copy the code exactly as it is shown above. Make sure that you don’t copy line numbers in the code click on the Copy button at the top right corner of the code snippet box



  16. I tried naming the new folder as you did in the example but I got an error that said something in the way of you cannot use a name like this. This Instruction may be helpful to some – but it is very difficult and confusing to me and does not help at all. As I said – you need to explain this down to the fine details or otherwise these tutorals will not help. The name of this site is wp BEGINNER – and that is what I am. You project these tutorals to the more experienced.

    I guess I will have to start going elswhere to get beginners instructiions because, most of time, wp beginner is not helpful – it is more like a techs only club.

  17. How do you get to the /wp-content/plugins/yoursitename-plugin/ in wordpress and upload a file there? I am lost on the first line of instruction. You guys always assume that we know these things in your instructions but they are not clear enough.

    I went to cpanel and opened up the wpcontent > plugins – and it shows a list of plugins – but I am lost from this point. How do I go about uploading a file in here? I am a beginner – and you guys seem to always explain things like your instructing experienced techs. I am not but I go to WP Beginner to try to learn. It is usually difficult to follow your instructions and I end up having to go somewhere else in google search to find things explained down to a beginners level.
    If you want to be more helpful try breaking things down a little more simple.

    • Hey Steven,

      I know the feeling! I’m far from a expert with wordpress and I pretty much live on google searches and this site trying to learn. I know a little bit and was able to get this to work. Send me your email and I’ll send you the steps with screenshots. I havent tested putting actual code into the plugin so we’ll see if that works….but I was able to see the newly created plugin on my admin page

  18. Thank you for the great advice and simple how-to instructions. I easily created a Site-Specific WordPress Plugin for my site and enabled shortcodes for widgets. Now I have less worry when changing themes, and I didn’t need to install another plugin. Again, thanks!

  19. hi i followed the instruction on how to make a site plugin for my site. ive uploaded it but cant see it in my list of plugins.

    any ideas why?

  20. I cannot find where the folders live in the plug in directory. I tried searching for: /wp-content/plugins/yoursitename-plugin/ (with my site name).

  21. Never mind, I figured it out and got it activated. My hosting server was acting up, must have timed out or something…cheers!

  22. I followed your instructions but i don’t know how to activate it. It doesn’t show in my list of plugind in my wp-admin. Can you help?

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