How to change font size on Matrix Widget

H, am i able to change the font in the matrix grid widget without changing the font on the rest of the form?

Yes that should be possible.

Are you using the one of these matrix widgets as you mentioned above?

If so which one?

Usually you can enter css into the Custom CSS Area to adjust it's text if the widget supports it.

Now if you meant the Matrix Field under survey tools then you would have to inject css into your jotform to make that happen which would look something like this - 

.form-matrix-table {

font-size: 16px;

}

Should you need more help with this then please provide us with a link to your jotform.

Very glad to see Kade's answer helped you out with changing font size on Matrix Widget