This is one of those simple, yet overlooked settings in WordPress. With as many dashboards as I have visited, I always see these numbers set to the default.
So what am I talking about?
Every time you insert an image into a post or page, you have four options when choosing the size.
But did you know you can change these?
First, let me point out something. I often get asked why on occasion is one of these sizes not available to choose. For example, the “large” size in the screenshot above. The reason for this is that the file you uploaded is smaller than the large size is set to. WordPress never lets you bump up the size here. Which is a good thing. That will most likely result in a fuzzy, unclear photo.
Now back to the settings. Select settings > media.
At the top of the window you will find these options. This is where “thumbnail”, “medium” and “large” can be edited.
Now to answer the question: Why would you change these? There could be all sorts of reasons. You might want to enlarge or reduce the default thumbnail size if they show up on your blog page. Or maybe you want a specific size all the time for certain images to make it consistent. Again, this would do the trick. Give some thought to the media settings and decide how they can best help you.