Luckily, you can increase the size of text through software, without having to sacrifice that high-definition resolution. You have a few ways to accomplish this, but here are the easiest methods ...

it does not provide the option to customize the font-family or size. Fortunately, you can use Tumblr's HTML editor, located on the Customize page, to change the font found in the body of your blog.

which can disrupt your viewing experience if all you want to change is the text size. For more precise adjustments, enable text zoom mode to enlarge or shrink only the text on a Web page.