Open a new image file considering its end use, in this case web viewing. For web viewing 72 dpi (dots per inch)is the standard. Your screen unlike paper or film is not capable of reproducing a high number of dots per inch, even HD monitors are not capable of coming close to print or film dpi’s. No need to go into greater detail on that here. The most important issue with dpi is that your text project is the same dpi as the images you plan to place it on. This will keep everything the same relative scale. Place a text line created in a 72dpi layer on a image saved at 300 dpi and what I am saying here will become immediately apparent. For this process I will assume you have optimized your images for web viewing and that all the files you use for this effort are saved at 72 dpi.

Note: if you are using this process for an image you are printing your text layers should be created at the same dpi as your images will be printed at.