mylo2h2s

DP ALTerminator adds missing or empty ALT tags to your content images.
Thanks to various shortcodes such as <code>%%DP_TITLE%%</code> or <code>%%DP_DATE%%</code> it’s pattern can be easily customized (you can mix plain text elements with shortcodes to create complex patterns)
DP ALTerminator works when ALT tags are missing or when they are empty. Sometimes WordPress itself, visual editors, and so on, leave an ugly <code>alt=""</code> which is useless and not always recognized by other famous ALT tag managers.
DP ALTerminator works only with content images ($content variable), because I didn’t want to alter “extra” images, like widgets, logos, menu icons and so on (most of the times, you want to manually edit their ALT or leave it empty)

DP ALTerminator – Missing ALT manager

Adds ALT tags to your content images when they're missing or empty. It's pattern can be customized with simple shortcodes.

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.

DP ALTerminator – Missing ALT manager vs AltTag CSV Importer