How to Increase PHP Memory Limit in WordPress Easily

When we start building a WordPress website, everything feels fast and smooth. Pages load quickly, plugins install easily, and the dashboard responds without delay. But as we continue adding themes, page builders, SEO tools, security plugins, and images, we may begin to notice slow performance, failed updates, or even scary error messages. This can be frustrating, especially when we don’t know what caused the problem. In many cases, the issue is not with WordPress itself, but rather that our website has run out of available memory.

We often don’t think about server memory while growing our site, yet it plays a big role in how well everything works behind the scenes. When memory is too low, tasks stop working properly. The good news is that we can fix this by learning how to increase PHP memory limit and give our website the resources it needs to run smoothly and reliably.

What is Increase PHP Memory Limit?

Increasing PHP Memory limit means raising the amount of memory that PHP scripts are allowed to use on your web server. PHP is the language that runs platforms like WordPress and many web applications. By default, hosting providers set a memory limit to prevent one website from consuming too many server resources.

When your website runs heavy tasks such as plugins, themes, image processing, or large database queries, it may exceed the default memory limit. This can cause errors like “Allowed memory size exhausted”, slow performance, or failed updates.

Increasing the PHP memory limit gives your website more resources to handle complex processes smoothly. This improves performance, prevents crashes, and ensures plugins, themes, and scripts run properly. It is commonly adjusted in the php.ini file, .htaccess, or wp-config.php, depending on your hosting setup.

What Causes Memory Exhaustion?

Low memory errors in WordPress usually happen when your website tries to use more server resources than the allocated PHP memory allows.

• Heavy Plugins & Page Builders: Heavy plugins like page builders, backups, security tools, and SEO suites consume significant memory, and running several at once may require you to increase the WordPress memory limit to avoid errors and slowdowns. You should also optimize WordPress themes for SEO by using lightweight, well-coded themes that improve performance and search visibility.
• Poorly Coded Themes: Themes with inefficient coding, excessive scripts, or built-in features that load unnecessary assets can increase memory usage. Switching to a lightweight, optimized theme can reduce the need to increase wp memory limit.
• Large & Unoptimized Images: Uploading high-resolution images forces WordPress to create multiple thumbnail sizes, which requires extra memory. If images are not compressed, memory usage increases during processing.
• High Traffic & Concurrent Users: When many visitors access your site at the same time, the server must run multiple PHP processes. This increases memory demand and may cause exhaustion if limits are too low.
• WooCommerce & Dynamic Content: Ecommerce sites process cart sessions, payment requests, and real-time product data. These dynamic operations consume more memory compared to static websites.
• Background Tasks & Scheduled Processes: Automated backups, malware scans, cron jobs, and scheduled tasks run in the background and use memory. If several tasks run simultaneously, they can exceed available resources.

Understanding these causes helps you identify performance bottlenecks and decide when to increase PHP memory limit for smoother website operation. By optimizing resources and allocating sufficient memory, you can prevent crashes, improve speed, and ensure your WordPress site runs reliably.

4 Proven Methods to increase PHP memory limit in WordPress

If your website is showing fatal errors, slow dashboard performance, plugin crashes, or “allowed memory size exhausted” messages, it means your server does not have enough allocated PHP memory.

Modern WordPress websites use page builders, WooCommerce, SEO plugins, security tools, and backup systems that require higher server resources. That’s why learning how to increase memory limit is essential for improving website speed, stability, and overall performance. Below are four reliable and detailed methods you can use to safely increase memory allocation and prevent WordPress memory exhaustion issues.

Method 1: Increasing Memory Limit via wp-config.php

To increase PHP memory limit through the wp-config.php file is one of the safest and most effective ways to resolve memory-related errors such as “Allowed memory size exhausted.”

Step 1: Log in to Your Hosting Account

Access your hosting control panel (such as cPanel, Plesk, or a custom dashboard).

If you use cPanel:

• Go to File Manager
• Navigate to the public_html folder (or your WordPress root directory)

If you use FTP:

• Open an FTP client like FileZilla
• Connect using your FTP credentials
• Locate your WordPress root folder

Your WordPress root folder contains files like:

• wp-admin
• wp-content
• wp-includes

Step 2: Locate the wp-config.php File

Inside the root directory, find the file named:

• wp-config.php

This file controls core WordPress configuration settings, including database connection and memory limits.

Before editing, create a backup copy of the file. This ensures you can restore it if something goes wrong.

Step 3: Open wp-config.php for Editing

Right-click the file and choose:

Edit (in File Manager)
or

Open it in your FTP text editor

You will see several configuration lines inside the file.

Step 4: Find the “That’s all, stop editing!” Line

Scroll down until you see this line:

/* That's all, stop editing! Happy publishing. */

You must add the memory limit code just above this line.

Step 5: Add the Memory Limit Code

Insert the following line above the “That’s all” comment:

define('WP_MEMORY_LIMIT', '256M');

This increases the WordPress memory limit to 256MB.

If you run a WooCommerce store or use heavy plugins, you can increase it further:

define('WP_MEMORY_LIMIT', '512M');

For admin-heavy tasks like imports or backups, you may also add:

define('WP_MAX_MEMORY_LIMIT', '512M');

This specifically increase PHP memory limit for the WordPress admin dashboard.

Step 6: Save the File

Click Save after adding the code.

If using FTP:

• Save the file locally
• Upload it back to overwrite the original

Step 7: Verify the Memory Limit

To confirm the change:

• Log in to your WordPress dashboard
• Go to Tools → Site Health → Info → Server
• Check the PHP memory limit

Alternatively, you can use a plugin like Query Monitor to confirm the memory allocation.

Step 8: Clear Cache (If Applicable)

If you use caching plugins or server-level caching:

• Clear your WordPress cache
• Clear server cache
• Clear CDN cache (like Cloudflare, if used)

This ensures the new configuration loads properly.

Method 2: Increasing Memory Limit via php.ini Configuration

The php.ini file controls your server’s core PHP settings, including the memory limit allocated to PHP scripts. Increasing this value helps resolve memory exhaustion errors, especially for resource-heavy WordPress or WooCommerce websites. Follow these steps carefully:

Step 1: Locate Your php.ini File

First, you need to find where your php.ini file is stored.

Common locations include:

• /public_html/
• /home/username/
• /etc/php/7.x/apache2/
• /etc/php/8.x/fpm/

If you're unsure:

• Log in to your hosting control panel (such as cPanel or Plesk).
• Use File Manager and search for php.ini.

Alternatively, create a file named phpinfo.php in your root directory with this code:

<?php
phpinfo();
?>

Open it in your browser and look for Loaded Configuration File to see the exact path.

Step 2: Open the php.ini File

Once located:

• Open the file using File Manager (Edit option), or
• Access it through FTP (using FileZilla or similar), or
• Edit via SSH if you have server access.

Make sure to create a backup before editing.

Step 3: Find the memory_limit Directive

Inside the php.ini file, search for:

• memory_limit =
• You may see something like:
• memory_limit = 128M
  

Step 4: Increase PHP Memory Limit

Change the value to a higher limit depending on your needs.

For example:

memory_limit = 256M

Or for high-resource WooCommerce stores:

memory_limit = 512M

For most WordPress and WooCommerce websites, 256M is generally sufficient.

Step 5: Save the File

After updating the value:

• Click Save in File Manager, or
• Upload the updated file via FTP.

Step 6: Restart the Web Server (If Required)

On VPS or dedicated servers, changes may not apply immediately. You may need to restart:

• Apache
• Nginx
• PHP-FPM

If you are on shared hosting, your hosting provider may automatically apply changes.

Step 7: Verify the New Memory Limit

To confirm the change:

1. Refresh your phpinfo.php page.
2. Look for the updated memory_limit value.

You can also check inside your WordPress dashboard:

Go to Tools → Site Health → Info → Server

This method provides a direct and server-level solution, making it one of the most effective ways to resolve PHP memory issues.

Method 3: Increasing Memory Limit via .htaccess File

This method works for most shared hosting environments that run Apache servers. It allows you to increase PHP memory limit without accessing server-level settings.

Step 1: Log in to Your Hosting Account

Open your hosting provider’s dashboard.

Log in using your credentials.

Navigate to File Manager.

If you use cPanel, go to:

cPanel → File Manager → public_html

If your WordPress site is installed in a subfolder, open that specific directory instead.

Step 2: Locate the .htaccess File

Inside your WordPress root directory (usually public_html), find:

.htaccess
Important:

If you don’t see the file, enable “Show Hidden Files (dotfiles)” in File Manager settings.

The .htaccess file starts with a dot, so it remains hidden by default.

Step 3: Create a Backup (Highly Recommended)

Before editing:

Right-click .htaccess

Click Download

Save a backup copy to your computer

This helps you restore the site if anything goes wrong.

Step 4: Edit the .htaccess File

• Right-click .htaccess
• Click Edit

Add the following line at the bottom of the file:

• php_value memory_limit 256M

You can adjust the value depending on your needs:

• 128M – Moderate websites
• 256M – Recommended for WooCommerce or heavy themes
• 512M – Large websites with many plugins

If you run a WooCommerce or feature-rich site, 256M is usually ideal.

Step 5: Save Changes

After adding the line:

• Click Save Changes
• Close the editor

Step 6: Check If It Worked

To verify:

• Log in to WordPress Admin

Go to:

• Tools → Site Health → Info → Server
• Look for PHP memory limit

Or install a plugin like:

• WP-ServerInfo
• WP Health Check

If the limit has updated, the change was successful.

Method 4: Increase PHP Memory Limit via Hosting Control Panel Settings

Increasing your PHP memory limit through your hosting control panel is one of the safest and easiest ways to resolve “Allowed memory size exhausted” errors in WordPress or WooCommerce. This method does not require editing core files, and most hosting providers support it.

Step 1: Log in to Your Hosting Account

First, log in to your hosting provider’s dashboard.

Most hosting providers offer one of the following control panels:

• cPanel
• Plesk
• A custom dashboard (like Bluehost, Hostinger, SiteGround, etc.)

Locate the section labeled Control Panel, Advanced, or Hosting Settings.

Step 2: Open the PHP Settings or MultiPHP Manager

Inside the control panel, look for one of these options:

• Select PHP Version
• MultiPHP INI Editor
• PHP Configuration
• PHP Settings
• Software → PHP Options

In cPanel, you typically find:

• MultiPHP INI Editor, or
• Select PHP Version → Options

Click on it to access PHP configuration settings.

Step 3: Locate the Memory Limit Setting

Once inside the PHP settings panel:

• Look for a field labeled memory_limit
• You may see a dropdown menu or a text input box

It may currently be set to:

• 128M
• 256M
• 512M

The default value for many shared hosting plans is often 128M, which may not be sufficient for WooCommerce stores, heavy themes, or multiple plugins.

Step 4: Increase PHP Memory Limit

Change the memory limit to a higher value.

Recommended values:

• 256M → Suitable for most WordPress sites
• 512M → Recommended for WooCommerce stores or large websites
• 768M or 1024M → For high-traffic or resource-heavy websites (if hosting plan allows)

Enter the new value (for example: 512M) and save the changes.

Click Save, Apply, or Update depending on your hosting panel.

Step 5: Confirm the Changes

After saving:

Log in to your WordPress dashboard

Go to:

• Tools → Site Health → Info → Server
• Check the PHP memory limit value

You can also install a plugin like WP Server Info to verify the updated memory limit.

Step 6: Clear Cache (Important)

If you are using:

• A caching plugin
• Server-level caching
• Cloudflare
• Clear all caches to ensure the new memory limit reflects properly.

Increasing memory through the hosting control panel helps prevent WordPress plugin conflicts, improves WordPress admin performance, supports WooCommerce checkout processes, and ensures smooth execution of backup and security scans.

How Much Memory Does WordPress Need?

Memory requirements vary depending on website complexity.

For most modern websites, 256MB is the recommended baseline.

Conclusion

In conclusion, learning how to increase PHP memory limit is very important for keeping your WordPress website fast, stable, and error-free. When your site runs out of PHP memory, you may see fatal errors, slow-loading pages, plugin crashes, or WooCommerce checkout issues. By increasing WordPress's memory limit, you improve website performance, support heavy plugins, and ensure smooth admin dashboard operations.

Whether you update the wp-config.php file, change PHP settings, or adjust hosting control panel options, giving your site more server resources helps prevent memory exhaustion errors. Always combine memory optimization with website speed optimization, plugin management, and reliable WordPress hosting. With the right memory settings and proper website maintenance, we can improve site performance, enhance SEO rankings, and deliver a better user experience for every visitor.

Frequently Asked Questions (FAQs)

1. What happens if my PHP memory limit is too low?

When your website exceeds its allocated PHP memory, you may see fatal error messages, white screens, or slow dashboard performance. Low memory can also cause plugins, themes, and WooCommerce features to stop functioning properly.

2. How do I know if memory exhaustion is causing website errors?

You may notice an “Allowed memory size exhausted” error message or repeated plugin crashes during updates. Checking your site’s debug log or asking your hosting provider can confirm whether memory limits are the issue.

3. Is increasing the memory limit safe for my website?

Yes, increasing memory is safe as long as it stays within your hosting provider’s allowed server limits. It simply allows PHP processes to use more resources, helping your website run smoothly without interruptions.

4. How much memory should a WooCommerce store have?

Most WooCommerce stores perform best with at least 256MB of PHP memory to handle cart sessions, checkout processes, and dynamic product data. Larger or high-traffic stores may require 512MB or more for optimal performance.

5. Can shared hosting users increase their memory allocation?

Yes, many shared hosting providers allow users to adjust PHP settings through the hosting control panel. If manual file edits do not work, contacting support to increase wp memory limit is often the quickest solution.

6. Does increasing memory improve website speed?

When we increase PHP memory limit, it improves performance if your site previously struggled with resource shortages. However, combining proper optimization, lightweight themes, caching, and quality hosting delivers the best long-term speed improvements.