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.

Julian

Do not worry about the implementation of the Google Tag Manager Code anymore! Simply login via your Google Account and install GTM on your WordPres Website under a minute.
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GTM+ WordPress

This plugin easily places the Google Tag Manager container code onto your WordPress website, so you do not have to worry about a manual installation.

Post Tags Export/Import vs GTM+ WordPress