viljuska

WordPress plugin for auto generating image alt attribute. On image upload, if alt attribute is empty:
<ol>
<li>Generates image clean title from filename</li>
<li>Then, generates alt attribute from image title.</li>
<li>Updates image with new settings</li>
</ol>
Also, on already uploaded images, it generates alt and title if not present while image is showing on the front end.

Imager

Wordpress plugin for auto generating image alt attribute. On image upload, if alt attribute is empty: Generates image clean title from filename Then …

Bradley Dalina

Image Tag Manager is a WordPress plugin that allows to dynamically generates (alt, title, caption and description) in images (except iframes content) for SEO enhancement. 
It also fixed the filenames before saving, removing unnecessary characters to transform into more meaningful and SEO friendly filename.
“This plugin is limited with its available settings. Before writing a review, please mention that you read the whole description and clearly understand the limit and usage of the plugin.”
NOTE: Please always read the changelog for the plugin updates.
Plugin Options
Basic 
* On upload image file 
 * Set image alt (Default) 
 * Set image title (Default) 
 * Set image caption (optional) 
 * Set image description (optional)
Alt/Title 
* Override Settings 
 * Override Alt ( Overrides the current/existing alt attributes of the image ) 
 * Override Title ( Overrides the current/existing title attributes of the image ) 
* Additional String in Attributes, Applicable inside the entry post content or page articles only 
 * Use bar ( | ) instead of hypen ( – ) 
 * Add Post/Page title to image alt attributes ( Ex: Image Alt – Post Title ) 
 * Add Post/Page title to image title attributes ( Ex: Image Title – Post Title ) 
 * Add Post/Page first category to image alt attributes ( Ex: Image Alt – Category ) 
 * Add Post/Page first category to image title attributes ( Ex: Image Title – Category ) 
* Character or String Removal in Attributes (Global) 
 * Enable String Trimmer ( This allows you to trim/remove any part of the string from the alt or title attributes ) 
 * Remove or trim this words if found from the alt attributes ( Separated by comma ) 
 * Remove or trim this words if found from the title attributes ( Separated by comma )
Word Settings 
* Special/Nonword Character Preservations 
 * Clean All ( Remove any nonword characters in the entire string of the Alt/Title Attributes ) 
 * Preserved All ( Preserved the entire string characters in the Alt/Title Attributes special or nonword characters including numbers) 
 * Preserved Special ( Preserved special or nonword characters and make stripping numbers optional in the Alt/Title Attributes ) 
* Numerical Character Preservations 
 * Strip Numbers ( Remove numbers in the filename: “filename 300×450.jpg” becomes “filename” ) 
 * Use Post/Page title as fallback to image attributes ( For randomly generated filenames like 1127.jpg or with less than 3 letters and image is not attached in a post) 
* String Case Manipulation 
 * Leave Unchanged 
 * Lowercase ( Alt/Title Attributes will be converted to lowercase ) 
 * Uppercase ( Alt/Title Attributes will be converted to uppercase ) 
 * Capitalized ( Alt/Title Attributes will be capitalized each word ) 
 * Sentence Case ( Alt/Title Attributes will transform the first letter of the first word only )
Extra 
* Add default class ( class=”your-default-class” ) 
 * Global (Throughout the site ) 
 * Entry Post Section ( Applies in the entry post section only ) 
 * Default Class ( Separated by single space ) 
* Disable Srcset and sizes 
 * Remove srcset & sizes attribute ( Get rid of srcset=”” sizes=”” attribute )
advance 
* Applicable only on the post content generated by wordpress from content editor. The hardcoded image can’t be save in the database. 
 * Use data saving attributes ( This will be saved along with the post content and can work even when the plugin was removed. )

Image Tag Manager

Recommend this plugin! awesome easy to use. Great Job for this developer. More plugin develop!

Awesome Plugin!

This plugin allows you to dynamically generates (alt, title, caption and description) in any images of your site for SEO enhancement.

Imager vs Image Tag Manager