Change the size of text in your Tumblr posts by using HTML tags. You can change the size of the entire post or just certain portions of the post, and you can make the text larger or smaller.

The window also contains two text boxes in the Dimensions section that allow you to set your image's dimensions. When you click "Insert," Tumblr adds the image to the editing box.

Increasing or decreasing the size of the text in your operating system or Web browser can be tricky, but our easy guide walks you through it.