# Cannot change font size in visual.TextBox

**URL:** <https://discourse.psychopy.org/t/cannot-change-font-size-in-visual-textbox/19185>\
**Category:** Coding\
**Tags:** screen, font, textbox\
**Created:** [December 22, 2020, 11:40am UTC](https://discourse.psychopy.org/t/cannot-change-font-size-in-visual-textbox/19185 "2020-12-22T11:40:39Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Gualor](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.psychopy.org/gualor/32/13090_2.png) [@Gualor](https://discourse.psychopy.org/u/Gualor)\
**Post date:** [December 22, 2020, 11:40am UTC](https://discourse.psychopy.org/t/cannot-change-font-size-in-visual-textbox/19185/1 "2020-12-22T11:40:39Z")

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Hi everyone!  
I am very new to Psychopy and I’m writing code for a P300 speller experiment setup.

In this experiment I have a matrix 6x6 of alphanumeric characters, and with very precise timing I need each row or column to be highlighted exactly once in every run. I manage to make the col or row blink for now (using the TextBox class as it performs way better than stimtext for submillisecond timing).

However, one thing I was not able to do (and which is possibile with stim text) is change the font size inside the textbox. I looked up every API I could find in the class and even the source code itself, but found nothing about changing font size. Is there any way to do it?

Thanks in advance!