Demis Patti

Responsive website background images with a parallax effect and a user friendly interface. 
Your theme must support <a href="https://codex.wordpress.org/Custom_Backgrounds" rel="nofollow ugc">Custom Backgrounds</a>, which it most likely does already.
<h3>Features</h3>
<ul>
<li>Background image with a parallax effect</li>
<li>One image for all pages or each page individual or a mix of both, it’s all up to you</li>
<li>Serves the whole frontend</li>
<li>Works vertically and, for fun, horizontally</li>
<li>Various overlays to choose from</li>
</ul>
<h3>Requirements</h3>
<ul>
<li>Your theme must support the core WordPress implementation of the <a href="https://codex.wordpress.org/Custom_Backgrounds" rel="nofollow ugc">Custom Backgrounds</a> theme feature.</li>
<li>In order to use the parallax feature, I decided to set the minimum required image dimensions to 1920px * 1200px, which covers a fullHD screen with a slight vertical parallax movement ( Image height – viewport height, so 1200px – 1080px gives 120px offset to move the image. I hope you get the point here.).</li>
<li>You most likely need to edit some css in order to “uncover” the background image or parts of it respectively. Your theme’s layout should be “boxed”, or an opacity should be added to the page content container for the background image to be seen.</li>
<li>PHP version 8.0 or above.</li>
</ul>

cbParallax

Responsive website background images with a parallax effect and a user friendly interface. Your theme must support Custom Backgrounds, which it most l …

perceptionsystemlabs

A full background manager WordPress plugin allows users to set different background images on each page. Being a free and feature-rich plugin, it delivers an incredible experience to users by allowing them to set images to the background of the body.
The company developed this full-fledged plugin for all the WordPress users, who wanted to give different look on the each page of their website as it has capability to change the entire look, feel and touch of your website within just few seconds.Moreover, users of plugin are also allowed to set the background color, background Layout and background image as per their ease.
One of the best things about this plugin is that it comes with lots of features that will surely give a wonderful experience that you ever get with any other plugin. Moreover, it also allows you to set images as per your convenience like in the fixed, middle, right, left, stretch and more. However, it is a page WordPress plugin, not a post plugin, so users need to make sure it while downloading it.
To update the version of this plugin, the company has done lots of changes in the coding part of it and various bugs have been solved as well.Therefore, users will not get any problem while using this plugin in their website as it brings numerous new options like background Layout and background image
Imp Note – While updating this new version of the plugin, you should make sure to take all back-up of your website with database so that you will not face any problem in near future.
How to Install Full Background Manager WordPress Plugin?
<ul>
<li>First of all, you need to download the plugin and install it in your website.</li>
<li>Now, you can activate and go the page in WordPress admin.</li>
<li>After this, you can find the meta box its name like Full Background Manager at last the of every page in admin section.</li>
<li>Now, you have to upload an image by just clicking on the ‘Choose Image’.</li>
<li>After uploading image you can see one dropdown to set background postion of page.</li>
<li>At last, you just need to publish the page and you will get the image in the background of the page.</li>
</ul>
So, these were simple steps that you can follow to install this plugin on your website and successfully change the background of each pageYou can also check-out the demo of this plugin in order to get its view. <a href="http://115.112.143.25/CMS/wp/fully-background-manager" rel="nofollow ugc">Click here </a> to check-out the demo of this plugin. 
Perception System offers this user-friendly and highly flexible plugin to enable you to give your website’s each page a refreshing look that you desire. Additionally, the company also provides various other products for its precious customers. To know more about the other products of the company, you can 
http://www.store.perceptionsystem.com

Full Background Manager

Full Background Image Manager WordPress Plugin allows you to set separate background image of each page.

cbParallax vs Full Background Manager