Google Advertising ID (GAID)

What is the Google Advertising ID (GAID)?

The Google Advertising ID (GAID) is a unique, anonymous, and user-resettable identifier assigned to an Android device by Google Play Services. It was created to help app developers and advertisers track ad performance, attribute app installs, and deliver personalized advertising, all while allowing users to maintain control over their privacy.

Before the introduction of GAID, developers relied on persistent, non-resettable hardware identifiers (like MAC addresses or Android IDs). GAID replaced these to create a more privacy-conscious ecosystem, acting as the Android equivalent to Apple’s Identifier for Advertisers (IDFA).

Why GAID matters

GAID enables advertisers and mobile measurement partners (MMPs) to:

• Track user activity across apps

• Attribute app installs accurately

• Deliver personalized ads based on user behavior

At the same time, GAID respects user privacy controls, allowing users to reset their ID or opt out of personalized advertising.

How GAID works

Each Android device is assigned a unique Google Advertising ID used for advertising and measurement. When a user views, clicks, or installs an app after interacting with an ad, the GAID is shared between apps, ad networks, and mobile measurement partners to link ad activity with installs and in app events.

GAID supports attribution by providing a consistent identifier across different apps and platforms. This allows advertisers to understand which campaigns and channels drive installs and user actions, while avoiding the use of personal data.

User privacy is built into the system. The advertising ID can be reset at any time, and users can opt out of ad personalization, ensuring tracking aligns with individual privacy preferences.

Why GAID is important

• Improve ad targeting and relevance

• Measure campaign performance effectively

• Build trust with users by respecting their privacy settings