---
title: How to create a mu-plugin? (must use plugin)
url: "https://www.seopress.org/support/guides/how-to-create-a-mu-plugin/"
lang: en-US
updated: 2023-07-18
---

# How to create a mu-plugin? (must use plugin)

A **must use (mu) plugin** is like a normal WordPress plugin except you can’t **deactivate** it.

It runs as soon as you upload it using a FTP client (Filezilla, Transmit, Cyberduck etc.).

To deactivate it, just delete its directory from **wp-content/mu-plugins**.

Several hooks (including SEOPress ones) must be loaded via a mu-plugin.

It’s also a good alternative if you don’t have a **functions.php file**.

To create a must use plugin, go to **wp-content/mu-plugins** directory.

If this folder is not available, add it.

Then create a new file called “**seopress-mu.php**” (the name doesn’t matter).

Paste this snippet to **seopress-mu.php**:

And add your own **custom code** (like actions and filters) to your new mu-plugin.

**Test carefully your code! Remember, a mu-plugin is always activated.**

You will see your mu-plugin from your **WordPress admin, Plugins list, Mu-plugins** tab.