I know that writing descriptions for photos and art can be difficult. But if you're just posting a screenshot that's just text. Heres a big tip: all you have to do is copy-paste that into the alt text. At most, all you gotta add is clarification that it's a screenshot and where it originates.
For example, heres how i would write alt text for a screenshot of an article..
"screenshot from x news article that says-"
Then, you copy-paste in the text. It really is that simple! If you can't access the original text to copy-paste, just retype it from the screenshot.
If you dont know how to add alt text to photos on tumblr. When you add a photo to a post, click on the small dot menu on it. An option to add alt text should show up.










