Horje
Providing full control to set your own responsive image properties for WP 4.4+, the ability to use the tag and image backgrounds.

Noted That:

  • To install correctly this just-responsive-images.zip.
  • Fisrt Download the just-responsive-images.zip to your computer
  • Extract/Open just-responsive-images.zip to Your Computer.
  • Then, Find readme.txt file inside just-responsive-images.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 "just-responsive-images.zip" Plugin to your Local Computer. (Click Download)

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

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

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

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

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6. Now, Click on "Active Plugin"

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7. Then, See left sidemenu. "Just Responsive Images" folder is added on left sidemenu. Now, Click on "Just Responsive Images" folder.

   Noted that: If you do not see "Just Responsive Images" folder on left sidemenu then, see at left sidemenu "Settings" or "Tools".

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

 

oR

After Activated Plugin According to Step-6 then,

  1. Go to "Plugins" + "Installed Plugin" from Wordpress Admin Panel Leftside Menu.
  2. or Direct go to: https://yourdomain/wp-admin/plugins.php
  3. Then, Find "Just Responsive Images" Activated Plugin from Plugin List.
  4. Then, Click on "Settings" from Plugin that is Just Responsive Images
  5. Now, Edit/Add/Config the setting and Click on "Save Changes" button,
WP Plugin Setting


Guide
  1. Download, unzip and upload to your WordPress plugins directory
  2. Activate the plugin within you WordPress Administration Backend
  3. Add hook add_filter('rwd_image_sizes', 'my_rwd_image_sizes');
  4. Create new function my_rwd_image_sizes and set the configuration array. The example can be found inside the plugin folder in /data/config-example.php.
Reffered: https://wordpress.org/