I found and used a fantastic WordPress plugin called “Auto Image Attributes From Filename With Bulk Updater”. Yes, it’s a terrible name, but it works incredibly well.
I needed to add alt text to images that I had already renamed and googling this led to many solutions using SEO plugins I’d rather avoid. I kept searching and found this and it worked better than I could have expected. Having Alt Text improves your SEO.
With the default settings, I did a bulk update and it perfectly added alt text to all 656 images that I currently have. Nothing was broken, and no images were a problem after running it. I found it searching through plugins using the WordPress default Plugin search.
What is even nicer is that this company offers a paid version so that you can rename your files even better to get found in Google image searches. I used to get some of the images I had here found in Google image search and the traffic was always welcome. I will be buying that next.
Pretty great tool and it made a long and time-consuming job into just a matter of waiting a minute. I love it.