Google Forms add-ons are small third-party apps, sometimes called Google Forms plugins, that give Google Forms the features it doesn't have out of the box: countdown timers, PDF generation, payment collection, e-signatures, custom notification emails and more. They live on the Google Workspace Marketplace, install in a couple of clicks, and run right inside your form editor.
We searched the Marketplace fresh for this guide and checked every add on for Google Forms before recommending it, so every Google Forms extension below is live, actively maintained and widely used. Each entry links straight to its Marketplace listing.