I'm looking to do this as well. This is an important feature. I was able to input a very long text into a form free text input box and I can see this potentially being maliciously exploited.
Okay, After so many years of people asking, and all the answers being scrubbed from the internet clean, how do you do it? All I want is a 300 character limit for a form on a page. Other than one person copying and pasting the answer to it on a post that has been deleted, not one person has been able to answer this questions Here is my Form:https://www.apcf.org/volunteer
I just want the character limit in the text area boxes
If anyone can genuinely help, please do.