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How to change the font color in the Arduino IDE

Have you ever wanted to change the font color in the Arduino IDE?

Maybe it is hard for you to read the light grey comments in the Arduino IDE, or maybe you prefer something a little bolder.

Whatever your reason, in this short video, I demonstrate a relatively easy way to change the font color of comments.


  1. Avatar Nicolas Boulay on May 28, 2016 at 5:07 pm

    Hi, I’ve tested your hack but it doesn’t work fully. If I change color of “”, it’s work. But if I change color of “”, it’s always grey….
    What’s the problem?

  2. Avatar saurabh on June 15, 2016 at 2:52 pm

    Sir I want to make an alarm system with RTC DS3231 and arduino uno ,But i don’t have library of RTC 3231 .I have download many library from internet but its not working properly .Please help me to get RTC DS3231 Library .

  3. Avatar DEMON on August 23, 2017 at 6:51 pm

    We cant change color for parentheses, brackets, numbers…

  4. Avatar Bill Pierce on February 20, 2018 at 11:14 pm

    For a PC, it’s a bit easier to use wordpad rather than notepad because wordpad will format the text. To use wordpad, right-click on the theme.txt file, select “Open with”, and then select “Wordpad”. Also, this website: is a convenient way to determine what hex codes to enter.

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