Hi. I use the "[node:title] | [site:name]" tokens for the main image of news articles, blog posts, and similar publications. It's a quick and practical automatic ALT.
https://backdropcms.org/project/metatag
https://backdropcms.org/project/xmlsitemap
https://backdropcms.org/project/imagefield_tokens
These are more powerful modules, in my opinion...
I recently did this for my website and it increased my PageSpeed score significantly. I just installed and configured the following modules:
Alt/Title Default (to set default...
Comments
This question may be redundant. With a better search of the existing forum topics I found several comments on these modules.