To use Google Docs add-ons, open a document → click Extensions → Add-ons → Get add-ons . Browse or search (e.g., "Doc to Form", "Translate"), click an add‑on → "Install" → grant permissions. To use it, go back to Extensions → click the add‑on name → launch it . Popular add‑ons: Docs to Markdown, Export to ePub, Lucidchart Diagrams . That's how to extend Google Docs functionality with add‑ons. 🔧📄