fastfinge 1 points 6y ago
Like /u/Marconius said, alt-text is the way to go, if you're writing the website. However, if it's a forum type system where you can't write HTML, naming your file descriptively might help. If no alt-text is present, some screen-readers will resort to using the file name as the description. So on some sites, where the author didn't bother to label his icons, I can usually guess what they do thanks to names like "subscribe_btn.jpg", "profile_thumb.jpg", etc.
Marconius 1 points 6y ago
If you are coding the website yourself, or are applying the pictures yourself, simply add the alt attribute in the image source HTML code. Put as much description as you want into the alt tag, but keep it brief and to the point, and any screen reader will then read the alt text once it encounters the image.