BaiatuLuTata

Do you need to back up your post tags, migrate them to another site, or perform a bulk update in a spreadsheet? Post Tags Export/Import is the perfect tool for the job.
This plugin provides a simple interface under “Tools” in your WordPress admin area to handle two key tasks:
<ol>
<li>Export Posts to JSON: With a single click, you can download a clean JSON file containing the <code>title</code>, <code>slug</code>, and an array of <code>tags</code> for every post on your site.</li>
<li>Import Tags from JSON: Upload a JSON file (in the same format as the one you exported) to bulk update tags. The plugin uses the post <code>slug</code> to identify which post to update and replaces its existing tags with the ones from the file.</li>
</ol>
This is incredibly useful for: 
* Backing up and restoring tag structures. 
* Editing tags offline in bulk using a text editor or script. 
* Migrating tag information between staging and production environments. 
* Quickly applying a new set of tags to hundreds of posts.
The plugin is designed to be lightweight, secure, and easy to use.

Post Tags Export/Import

A simple and lightweight plugin to export all posts to a JSON file and import tags from a JSON file to update posts, matching them by slug.

George Stephanis

<a href="https://www.google.com/tagmanager/" title="Google Tag Manager" rel="nofollow ugc">You can sign up for a Google Tag Manager account here.</a>
This plugin makes it even easier to use Google Tag Manager, adding all the code itself — all you need to do is provide the Account ID!
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Google Tag Manager

I know there's been a lot of frustration with this plugin in the past, but after making the plugin author aware of Google's change to how the Tag Manager scripts should be loaded, he's updated the plugin and it works great.

I've tested version 1.0.2 of the plugin by dynamically injecting a Google Analytics script through the Google Tag Manager (which didn't work properly in version 1.0.1) and it now works perfectly!

Works Great After Update

Does what it says, inserts just the GTM code at the right time at the right location.

Fell in love with the simplicity of this plugin, wonder why it does not show up in top when looking for GTM plugin for WP.

Had to mess around with so many other plugins before I found it. All other related plugins are too complex, and slows down the site as well. This plugin does what its supposed to do and nothing else :)

"LESS is MORE"

Kudos to the author for such a beautiful implementation.

One suggestion though, if there would have been a single "do_action" with some custom action, before printing the GTM code, could make it easier to add some custom JS variables, if needed, to pass along to GTM, rather than printing them at wp_head with priority 9.

Love it

The Google Tag Manager plugin adds a field to the existing General Settings page for the ID and outputs the javascript to make it work.

Post Tags Export/Import vs Google Tag Manager