This plugin allows to add Polymer elements to your posts and pages, the same components used in Android OS. You can use the HTML editor with the Polymer tags directly or the shortcode [polymer] for all the elements. The correct HTML libraries will be imported automatically but must be installed from the plugin option page. 
For Polymer documentation please look at the official website: <a href="http://www.polymer-project.org/" rel="nofollow ugc">Polymer Project</a>
This is a rewritten of my previous plugin <a href="https://wordpress.org/plugins/polymer-components/" rel="ugc">Polymer for WordPress</a>, now it allows to use the latest Polymer libraries.
Features
<ul>
<li>Polymer tags directly available in posts / pages with the HTML editor;</li>
<li>components installer (install, remove and update);</li>
<li>[polymer] shortcode to access all installed tags;</li>
<li>auto import the necessary HTML components;</li>
<li>force import components;</li>
<li>Javascript editor in posts / pages admin;</li>
<li>template override option;</li>
<li>autop option.</li>
</ul>
Shortcode
[polymer ELEMENT-TAG ELEMENT-OPTIONS]ELEMENT-TEXT[/polymer]
Tags: core-icon, paper-button, paper-checkbox, paper-slider, etc.
Options: style, id, class, etc.
Examples
<pre><code>[polymer paper-checkbox][/polymer]
[polymer paper-button raised id="btn1" style="color: green"]A green button[/polymer]
[polymer paper-item icon="home" label="Test link"]<a href="http://www.google.it" target="_blank"></a>[/polymer]
</code></pre>
Notes
<ul>
<li>autop option: the autop() WordPress function adds p and br tags to the contents when a newline is found, but this can break the Polymer tags. This option allows to enable/disable autop() in posts / pages (plugin default: no autop)</li>
<li>template override option: if it is enabled the plugin will load a special template which provides only the required components to run a Polymer app. This is useful if you want a “fullscreen” Polymer app</li>
</ul>

WordPress Polymer Plugin

Add the latest Polymer elements to your website! Polymer brings an implementation of Google Material Design to the web.

John James Jacoby

Andrew Norcross

Matthew Gerring

This plugin adds a simple post-type drop-down to the post editor interface, allowing you to reassign any post to a new post type. It allows you to switch post’s type while editing your post.
<h4>Supported Types</h4>
The plugin can convert nearly every combination of posts, pages, and even custom post types:
<ul>
<li>Page to Post</li>
<li>Post to Page</li>
<li>Post to Custom</li>
<li>Custom to Custom</li>
</ul>
As of 3.0.0, support for switching to or from Attachments was removed. This may come back in a subsequent version.
Invisible post types, such as revisions, menus, etc., are purposely excluded. But, if you need to access invisible post types, you can adjust the boundaries using the ‘pts_post_type_filter’ filter.
<h4>Bulk Editing</h4>
With bulk editing (thanks to Matthew Gerring) you can select all the posts in a certain type and convert them to a new type with one quick action.
<h4>Block Editor</h4>
With block-editor (aka Gutenberg) support (thanks to Daniel Bachhuber) you can switch between post-types that use either the Block Editor and the Classic one, without losing any of your embedded content.

Post Type Switcher

Absolutely excellent


Post Type Switcher is a fantastic tool for quickly and easily changing the post type of posts and pages. Its simplicity is its strength—no unnecessary complications, just a straightforward solution that works seamlessly. Whether you're reorganizing your content or fixing mistakes, this plugin saves time and effort. Highly recommended for anyone managing WordPress content!


A Simple Yet Incredibly Useful Plugin

A simple way to change a post's type in WordPress

WordPress Polymer Plugin vs Post Type Switcher