# Security

## **Google Sheets Access**

Google has made it [easy to control who has access](https://support.google.com/docs/answer/2494822) to your current sheet. Keep in mind, SheetLink only works in sheets with the add-on installed and activated.

## API Keys & Authentication

From your google sheet, select **"Add-ons" > "SheetLink" > "🔐 Authentication"** for all apps requiring authentication.

All API and authentication keys are securely saved as [Google Document Properties](https://developers.google.com/apps-script/guides/properties) of the current Google Sheet only and **are never accessible by the SheetLink team**. App API keys can be used with respective SheetLink app formulas by anyone with access to the Google Sheet.

{% hint style="success" %}
The **"key=reset"** [option](https://docs.sheet.link/formulas/options) will reset the authentication for any app
{% endhint %}