WebMaestro.Fr

Upload the layers of your image, and create a parallax effect !
It works great on smart devices too !
The first step is to create with your favorite picture editing software (Photoshop, GIMP…) an independent image for each ground composing your image. All these layers shall be the same size, and should be in .png format as they are meant to include transparency areas. 
Then, on your post editing page in WordPress, click the Insert Media button, and (the same way you would create a gallery) upload your layers under the Create Parallax item. Reorganise the layers if needed, from the background to the front. 
You can finally configure the animation (calibrate, invert, limit, scalar, friction), and publish !
There is <a href="http://webmaestro.fr/image-parallax-plugin-wordpress/" rel="nofollow ugc">some examples</a> on the plugin page.
It uses <a href="http://wagerfield.github.io/parallax/" rel="nofollow ugc">parallax.js</a> by Matthew Wagerfield.

Image Parallax

Create images with a parallax effect. Upload some layers, configure the animation, and publish !

Oooh Boi

Parallaxer for Elementor brings the power of Rellax.js to your Elementor pages, allowing you to add smooth parallax scrolling effects to any widget with just a few clicks. 
But that is not all! 
With just one click you can apply smooth scrolling to all of your Elementor built pages. Smooth scroll is powered by the lenis.js library. 
Parallaxer also brings a mini fluid system for both typography and spacing which is brought to you by utopia.fyi fluid space calculator. It means that you no longer need to maintain typography and spacing across multiple breakpoints but rather provide only the desktop values while each value between the desktop and mobile will be interpolated.
<h4>Features</h4>
<ul>
<li>Easy to use interface in Elementor’s Advanced tab</li>
<li>Responsive speed controls for different devices</li>
<li>Lightweight and optimized for performance</li>
<li>Works with any Elementor widget (Containers excluded!)</li>
<li>Global scroll smoothing (via the User Preferences panel)</li>
<li>Includes a mini fluid system for both typography and spacing</li>
</ul>
<h4>How to Use</h4>
<ol>
<li>Edit any element in Elementor</li>
<li>Go to the Advanced tab</li>
<li>Find the “Parallaxer” section</li>
<li>Enable parallax and adjust settings</li>
<li>Preview and adjust as needed</li>
</ol>

Parallaxer for Elementor

Add smooth parallax scrolling effects to any Elementor widget using the lightweight Rellax.js and lenis.js libraries.

Image Parallax vs Parallaxer for Elementor