Editing Alt Text

Good evening.

I recently was looking into Adsense and was advised to change the “alt text” for my image files to the image description rather than it just showing an image size, or file name. Is there any other way to make these changes besides going through every post in dashboard, editing the images alt text and updating? This seems very tedious especially for having many images. Is there a way to edit the source code to speed up the process? Or any other ways?

Thanks in advance.

Anthony
https://www.dbzexperts.com