How to Safely Uninstall and Delete WordPress Themes (An Expert‘s Guide)

As a webmaster managing WordPress sites for over 15 years, I‘ve seen how themes pile up causing clutter and security issues. Over time, unused themes end up wasting space and creating technical debt.

So it‘s crucial to know how to properly remove inactive themes from your site.

In this detailed guide, I‘ll share insider tips to safely delete themes in WordPress based on experience from working on hundreds of sites.

Here‘s what we‘ll cover:

• Why you should delete unused themes
• The difference between uninstalling and deleting a theme
• Step-by-step process to remove themes
• What to do if you delete the wrong theme
• Expert advice for trouble-free theme management

Let‘s get started!

Why Should You Delete Old WordPress Themes?

Having too many unused themes on your WordPress site causes several problems:

Performance and Speed

Extra themes, especially bloated premium ones, slow down your site and make backups less efficient.

A test by Kinsta showed that removing unused themes can improve WordPress speed by up to 28%.

The more clutter you have, the harder it gets to run updates or make changes without affecting site stability. This phenomenon is known as "technical debt".

Think of it like keeping piles of unused furniture that make your house messy and difficult to maintain. Regular clean up is needed.

Security Risks

According to W3Techs, WordPress powers 41.5% of all websites on the internet. This makes it a huge target for hackers.

Old themes with security loopholes can easily be exploited to break into your site. Researchers found over 50,000 vulnerable themes on WordPress.org.

So it‘s essential to delete outdated or vulnerable themes before they get compromised.

Avoid Confusion

Having multiple unused themes makes it confusing to find the right one when making changes to your site.

You may end up accidentally modifying the wrong theme leading to errors.

Save Money (on premium themes)

Premium WordPress themes from Marketplaces like ThemeForest can cost $40-$60 per theme.

Installing multiple paid themes that you don‘t use is wasting money.

According to BuiltWith statistics, the average website uses 1.3 premium themes. So it‘s wise to only keep themes you actually need.

Now that you know why getting rid of inactive themes is important, let‘s go over some key terminology first.

Difference Between Deactivating and Deleting a Theme

Before we get into details of removing a theme, it‘s important to understand the difference between "deactivating" and "deleting" in WordPress.

Deactivating a Theme

When you switch to a new WordPress theme, the previous one gets deactivated automatically. This means:

• The theme is disabled on the frontend of your site.

• It‘s files remain on your server in the /wp-content/themes/ folder.

• You can reactivate it anytime from the WordPress dashboard.

Deactivation is a reversible action. So you can easily switch an inactive theme back to active.

Deleting a Theme

Deleting a theme removes its files from the /wp-content/themes/ directory on your server.

This means the theme is:

• Completely removed from your site.
• No longer available to use unless you reinstall it.

Deleting a theme is a permanent action. The files are gone for good unless you restore them from backup.

Now let‘s go through how to actually deactivate and delete themes in WordPress.

How to Safely Delete a WordPress Theme

When removing a theme, I recommend following these steps:

Step 1: Identify Your Active Theme

Go to Appearance → Themes in your WordPress dashboard.

The active theme shows up highlighted in green:

Make sure your main theme is active. If you have a parent/child theme setup, the child theme is usually the main one.

Important: Do not delete the current active theme on your site!

Also, don‘t remove the parent theme if your site is using a child theme (which depends on the parent to work properly).

Step 2: Download a Backup (Optional)

While not mandatory, it‘s good practice to take a backup before making major changes.

You have two options to backup your WordPress themes:

A) Backup via FTP

Connect to your site via FTP and download the theme folder to your local computer:

1. Access site files using an FTP client like FileZilla.

2. Go to the /wp-content/themes/ folder.

3. Right click on the theme folder and select download.

This lets you restore the theme later if something goes wrong.

B) Use a Backup Plugin

A better option is to install a dedicated WordPress backup plugin like UpdraftPlus.

It allows you to create and download a full WordPress backup containing all your themes, plugins, uploads etc.

This is useful if you want to migrate your site or restore it after a disaster.

Step 3: Deactivate the Theme

Before removing a theme completely, it‘s good practice to first disable it:

1. Go to Appearance → Themes

2. Click on the "Deactivate" link below the theme you want to remove:

This prevents any errors that can happen if you delete an active theme.

Once deactivated, WordPress will enable the next available theme in priority order.

Step 4: Delete the Theme

Now you‘re ready to permanently remove the theme files from your site.

There are a couple ways to delete a WordPress theme:

A) Delete Via WordPress Dashboard

The easiest method is to delete the theme directly from your WordPress dashboard:

1. Go to Appearance → Themes

2. Hover over the theme and click the "Delete" link.

3. Confirm deletion in the pop-up.

This will remove all files for that theme from your server.

B) Delete Via FTP

You can also delete a theme manually by removing its folder via FTP:

1. Access your WordPress files using an FTP client.

2. Navigate to /wp-content/themes/.

3. Right click the theme folder and select "Delete".

Both these methods are safe to use. Choose one that best fits your workflow.

Alternative: Delete via cPanel

If you don‘t have access to WordPress or FTP, you can also use your host‘s file manager. For example on Bluehost:

1. Go to cPanel and open File Manager.

2. Navigate to /wp-content/themes/

3. Delete the theme folder.

This removes the files from your server without needing access to your WordPress dashboard or FTP account.

What to Do If You Delete the Wrong Theme

In my early days of managing WordPress sites, I accidentally deleted a client‘s active theme thinking it was an unused one. The site immediately broke!

Thankfully, I had a recent backup and was able to restore the files. But it taught me an important lesson.

Here is what you can do if you make a mistake and delete the wrong theme:

• Restore from backup: If you have a recent full site backup, you can retrieve the deleted theme from it.

• Reinstall the theme: Download a fresh copy of the theme from the original source (WordPress.org repository or theme developer) and install it again. This option will lose any customizations made to the original theme.

• Check the trash folder: Some web hosts keep deleted files in a trash folder for a few days before permanently removing. You may be able to recover the theme from there.

• Use file recovery software: Tools like Recuva can scan your web server and recover deleted files. But results vary based on how soon you run the recovery after deletion.

• Contact the developer: For premium themes, you can often get support from the theme developer to help restore your purchase or send you a new copy.

Mistakes do happen on occasion. But you can avoid disasters by taking backups, and double checking before permanently deleting files.

Expert Tips for Managing WordPress Themes

Here are some best practices I recommend from experience managing clients sites:

🔑 Only keep themes you are actually using on your site. Avoid installing themes just to "try them out".

🔐 Get themes only from trusted sources like the official WordPress directory. Avoid nulled or pirated themes.

💾 Take a full WordPress backup before deleting themes or making major changes to your site. Test site recovery to ensure your backup is valid.

⏏ Use a staging environment to test themes before installing them on a production site. This prevents cluttering up your live site.

🕵️‍♀️ Perform periodic audits of all themes to check for vulnerabilities or outdated code. Delete risky themes.

🔒 Limit access to theme files by disabling file edits from within WordPress. Only make changes via SFTP/FTP.

⚡ Enable caching and other speed optimizations after deleting themes to maximize performance gains. Test speed using PageSpeed Insights or Pingdom.

i️ Educate clients on deleting unused themes and limiting theme bloat as part of your onboarding and maintenance. Set expectations on what you will keep/remove.

When Should You Not Delete a Theme?

While I recommend removing unused themes in most cases, here are some instances where deleting is NOT recommended:

• If the theme is required by a key plugin or addon on your site. For example, plugins bundled with certain themes.

• Parent themes of an active child theme. Since the child theme depends on parent theme code to function.

• Themes used for staging/development environments. These aren‘t used on live site so pose minimal risk.

• Themes you have extensively customized but are not currently using. Since custom code would be lost if you delete them.

• Premium themes no longer supported but purchased with an extended license. Keep these for emergency fallback.

• Themes provided by your web hosting company. Some hosts require keeping these for internal support.

As long as you have at least one active theme on your site, it is usually safe to remove unused themes. But use proper caution based on the exceptions covered above.

Conclusion: Keep Your Site Lean and Secure

No one likes clutter! Just as you spring clean your home to clear out junk, it‘s wise to do the same for your WordPress site.

Regularly removing unused themes improves speed, security, and overall site health.

Just be sure to backup your site and double check before deleting important themes. Avoiding disasters like deleting the active theme.

Now you have an expert‘s guide to properly uninstall and delete WordPress themes. Feel free to reach out if you have any other questions!