SiteValley Dev Team

AltTag CSV Importer is a WordPress plugin that lets you update image alt tags in bulk from a CSV import. It provides a preview of CSV data, an AJAX-powered progress bar, and an undo option to revert changes. The polished, fixed-width admin UI includes consistent thumbnail sizes and a responsive table layout to ensure a professional look on any screen.
A lightweight plugin that sets alt descriptions from a CSV of image links and their alt text.
– Fully Automatic Settings 
– Doesn’t Overwrite Existing Description 
– Child Image Detection (One Alt per Image Size) 
– Snapshot of Existing and Undo Button Available 
– Super Fast Execution 
– No Intrusive Ads (a dismissible plugin notice only).
<h3>License</h3>
This plugin is licensed under the GPLv2 or later. For more information, visit https://www.gnu.org/licenses/gpl-2.0.html.

AltTag CSV Importer

Simple Image CSV to ALT Tag plugin enables you to set an alt description on your images in bulk based on their links.

Jordy Meow

Rename the alternative text of your media easily directly using the Media Library, without a click.
BETA. This plugin was just created. I am waiting for the first feedbacks of my users to decide which way to go. The first thing I will implement is to update the ALT in the POSTS.
BE KIND. Again, this plugin is new. Please help us 🙂
More information available on http://apps.meow.fr/media-alt-renamer/.
<h4>Quickstart</h4>
<ol>
<li>Check the Media Library, in list view (not grid view).</li>
<li>Modify the Alt Text field, and simply type ENTER when it’s done.</li>
</ol>

Media Alt Renamer

Rename the alternative text of your media easily directly using the Media Library, without a click.

AltTag CSV Importer vs Media Alt Renamer