How to add Proportional Image Scaling in Wordpress

This plugin is an attempt to prevent distorted images when a CSS max-width rule is in effect and the image is inserted using the visual editor.

Noted That:

To install correctly this proportional-image-scaling.zip.
Fisrt Download the proportional-image-scaling.zip to your computer
Extract/Open proportional-image-scaling.zip to Your Computer.
Then, Find readme.txt file inside proportional-image-scaling.zip and Open readme.txt.
Now, Read the Requirements of this plugin. Which Wordpress Version and PHP Version are required to run this Plugin in Your Wordpress Site.
Then, Follow the Tips Below.

Start the Tips:

1. First Download "proportional-image-scaling.zip" Plugin to your Local Computer. (Click Download)

2. Then, Login to your "yourdomain.com/wp-admin" Dashboard.

3. Then, Click on "Plugins" + "Add New" from left sidemenu of Dashboard.

4. Now, Click on "Upload Plugin" button.

5. Now, Browse "proportional-image-scaling.zip" Downloaded plugin from your computer, Where you downloaded proportional-image-scaling.zip According to Step – 1 Above then, click on "Install Now"

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "Proportional Image Scaling" folder is added on left sidemenu. Now, Click on "Proportional Image Scaling" folder.

Noted that: If you do not see "Proportional Image Scaling" folder on left sidemenu then, see at left sidemenu "Settings" or "Tools".

8. Now you configure yourself oR Watch video tutorial below about Proportional Image Scaling Configurtions and Settings or How to work "Proportional Image Scaling" in your WordPress site.

After Activated Plugin According to Step-6 then,

Go to "Plugins" + "Installed Plugin" from Wordpress Admin Panel Leftside Menu.
or Direct go to: https://yourdomain/wp-admin/plugins.php
Then, Find "Proportional Image Scaling" Activated Plugin from Plugin List.
Then, Click on "Settings" from Plugin that is Proportional Image Scaling
Now, Edit/Add/Config the setting and Click on "Save Changes" button,

Guide
Just drop the .php file into the plugins folder and activate it. It should work fine out of the box. Configuration By default, the plugin removes all “width” and “height” attributes from images, that contain the term “wp-image-” in their class. To enable proportional scaling, a width can be entered here. If this width is zero, scaling is disabled and the attributes are removed. Additionally, images can be selected by terms that appear in their class attribute. It’s a space separated list, so “wp-image- foo” will match against “wp-image-” and “foo”. If one of these terms is missing, the image is not processed.

Guide

Just drop the .php file into the plugins folder and activate it.
It should work fine out of the box.

Configuration

By default, the plugin removes all “width” and “height” attributes from images, that
contain the term “wp-image-” in their class.

To enable proportional scaling, a width can be entered here. If this width is zero,
scaling is disabled and the attributes are removed.

Additionally, images can be selected by terms that appear in their class attribute.
It’s a space separated list, so “wp-image- foo” will match against “wp-image-” and “foo”.
If one of these terms is missing, the image is not processed.

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Reffered: https://wordpress.org/