You can limit answers to a specified number of characters or require a certain number of characters by using the Length response validation.
Similarly you can enforce a minimum character limit for any paragraph question.
You can write a regular expression to impose a word limit on the answer. The regex can be used to enforce a max or a min word count. For example, the below regex will restrict the answer to 300 words.
Click Submit to finish.
To use this feature, you need our Gsuite addon.
Install this addon to customize Google Forms.