How to Set Up Maintenance Mode for Joomla
Login to your Joomla administrator dashboard and click on Systems → Global Configuration
Under the Site tab, click on the Yes icon on the Site Offline.
Under Offline Image, click on Select button. Once the pop up appears, scroll down and look for Upload file. Click Choose Files button and browse for your maintenance mode picture. Click the Start Upload button to begin the uploading process.
You shall see the message Upload Complete: XXX.jpg
Next, you need to enter custom message for your maintenance page as highlighted.
Once you're done, you need to click on Save & Close button.
The website will appear like this once you visit the main website:
Under the Site tab, click on the Yes icon on the Site Offline.
Under Offline Image, click on Select button. Once the pop up appears, scroll down and look for Upload file. Click Choose Files button and browse for your maintenance mode picture. Click the Start Upload button to begin the uploading process.
You shall see the message Upload Complete: XXX.jpg
Next, you need to enter custom message for your maintenance page as highlighted.
Once you're done, you need to click on Save & Close button.
The website will appear like this once you visit the main website:
Updated on: 01/02/2019
Thank you!