The optional module, mbstring, is not installed, or has been disabled

Last Revised: October 2, 2021

If in your WordPress Site Health panel you see the message The optional module, mbstring, is not installed, or has been disabled, you have the possibility to correct it with some changes.

The optional module, mbstring, is not installed, or has been disabled.
The optional module, mbstring, is not installed, or has been disabled.

Shared Hosting

In case you have your website with WordPress on a shared hosting, you should contact your provider and ask them to activate the PHP mbstring extension.

VPS / Dedicated

If you have access to your VPS or dedicated server, you will need to install the PHP mbstring extension.

Ubuntu / Debian

apt install php-mbstring

CentOS / RHEL

yum install php-mbstring

cPanel Control Panel

If you have cPanel/WHM control panel, you can install PHP mbstring from the Software/EasyApache/Customize section.

Once there, in the PHP Extensions section you can search for “mbstring” and activate the corresponding options.

Panel de control Plesk

If you have Plesk control panel (Service Provider View), you can install PHP mbstring from the PHP Tools and Settings / Settings section.

Once there, the corresponding PHP version is selected and inside the “mbstring” option is activated.


About this document

This document is regulated by the EUPL v1.2 license, published in WP SysAdmin and created by Javier Casares. Please, if you use this content in your website, your presentation or any material you distribute, remember to mention this site or its author, and having to put the material you create under EUPL license.