Learn how to use conditional logic in Google Forms to create smarter, tailored surveys. Step-by-step guide to streamline your forms in 2025.

We show you how to highlight duplicates in Google Sheets using the COUNTIF and ARRAYFORMULA functions under the conditional format rules.

Within the Conditional Formatting function, Google has provided the option of using custom formulas. These custom formulas are what you'll have to use in order to make this thing work.