How to Install a WordPress Plugin (and What to Check First)

Plugins are how WordPress grows with your business. Want a contact form, better SEO, a booking calendar or faster pages? There's almost certainly a plugin for it. Installing one takes about a minute, but choosing the right one, and knowing what to check first, is where most site owners go wrong. Here's the full process, plus the quick checks I run before I let any plugin near a live site.

What a plugin is

WordPress.org describes plugins as PHP scripts that extend the functionality of WordPress, either improving existing features or adding new ones. The core software handles publishing and users, and plugins add everything else, which is why two WordPress sites can work so differently.

Method 1: Install from the dashboard

This is the simplest route and the one you'll use most often.

1. Log in to your WordPress dashboard.
2. Go to Plugins > Add New.
3. Use the search box at the top right to search by keyword, author or tag.
4. Click the plugin's title or More Details to read about it.
5. Click Install Now.
6. When installation finishes, click Activate.

Installing and activating are two separate steps. An installed plugin does nothing until you activate it, which is handy when you want to set something up without switching it on straight away.

Method 2: Upload a zip file

Plugins you've bought from a developer's own website usually arrive as a zip file. Here's how to add one:

1. Go to Plugins > Add New.
2. Click the Upload Plugin button at the top of the screen.
3. Choose the zip file from your computer.
4. Click Install Now.
5. When you see Plugin installed successfully, click Activate Plugin.

Don't unzip the file first. WordPress expects the zip exactly as it came from the developer.

The three installation methods compared

Method	Best for	Difficulty
Install Now from Add New	Free plugins in the WordPress directory	Easy
Upload Plugin	Plugins downloaded as a zip from a developer	Easy
Manual upload with SFTP	Rare cases, such as when the dashboard won't load	Technical

WordPress.org lists exactly these three ways to install a plugin. The third, uploading files directly to your server, is for rare cases, so most business owners never need it.

The check people skip: compatibility

Here's the insight that saves you from a broken site. On the Add New screen, every plugin shows a note saying either Compatible with your version of WordPress or Untested with your version of WordPress. WordPress.org warns that a plugin which hasn't been updated since the most recent core update may be incompatible, or its compatibility may be unknown.

Untested doesn't always mean broken, but it's a warning sign. A plugin that hasn't been touched in a long time is more likely to clash with newer WordPress versions or other plugins. I'd always pick an actively maintained option over an abandoned one, even if the abandoned one has more features.

Before you install anything on a live site

• Take a backup of your site, so you can roll back if something goes wrong.
• Read the plugin's details: when it was last updated and what other users say.
• Check it does one job well, rather than adding dozens of features you won't use.
• Make sure you don't already have a plugin doing the same job.
• If you can, try it on a test copy of your site first.

WordPress.org says plugins in its directory are thoroughly tested and considered safe, but also that they vary in quality and are often works in progress. That's honest, and it's why a few minutes of checking is always worth it.

What to do after activating

Most plugins add a new menu item or a settings page. Look for it in the left-hand menu or under Settings, and work through the setup before you rely on it. Then check your site on the front end, on desktop and mobile, to make sure nothing looks odd. If something has broken, deactivate the plugin you just added and the problem usually disappears.

Keep your plugin list lean

Every plugin is extra code your site has to run and another thing to keep updated. A tidy site with a handful of well-chosen plugins is faster and safer than one with dozens. Once a quarter, go through your list, delete anything you don't use, and update the rest. My guide to securing and protecting your website explains why outdated plugins are one of the biggest risks, and my roundup of website monitoring tools helps you spot problems fast.

Which plugins are worth installing first?

For most small business sites, start with the essentials: a security plugin, a backup plugin, an SEO plugin and a caching plugin for speed. Add a contact form if your theme doesn't have one. Then stop and only add more when you have a clear need. If you're publishing a lot of content, my guide to automating WordPress publishing covers tools that save hours each week.

My verdict

Go to Plugins > Add New, search, click Install Now and then Activate, or use Upload Plugin for a zip file. Before you do, check the compatibility note, look at when it was last updated, and back up your site. Fewer, better plugins will always serve you better than a long list of maybes.

Frequently asked questions

How do I install a plugin in WordPress?

Go to Plugins > Add New, search for the plugin, click Install Now, then click Activate.

How do I install a WordPress plugin from a zip file?

Go to Plugins > Add New, click Upload Plugin, choose the zip file, click Install Now, then Activate Plugin.

Why isn't my new plugin working?

Check you clicked Activate after installing. An installed plugin does nothing until it's activated.

Is it safe to install plugins marked untested?

WordPress.org warns that untested plugins may be incompatible. Prefer actively updated plugins and back up first.

How many ways can you install a WordPress plugin?

Three: Install Now from the directory, Upload Plugin with a zip file, or a manual upload with an SFTP client.