Glossary

Google Advertising Identifier (GAID)

Google Advertising Identifier (GAID) is a unique, resettable ID assigned to Android devices that allows advertisers and app developers to measure campaign performance, attribute installs, and deliver personalized ads while giving users control over their privacy.

It functions as Google’s counterpart to Apple’s IDFA (Identifier for Advertisers), enabling advertisers to track engagement and conversions without directly collecting personally identifiable information.

What is Google Advertising Identifier (GAID)

GAID is a system-generated identifier linked to Android devices through Google Play Services. Each user device receives its own GAID, which helps marketers understand how users interact with ads and apps.

Through GAID, advertisers can:

  • Attribute conversions such as app installs or in-app purchases to specific campaigns.
  • Analyze which media channels perform best.
  • Create audience segments for retargeting or lookalike campaigns.

Unlike permanent device IDs, GAID can be reset or disabled by users at any time, which adds an important layer of transparency and privacy control.

For example, if you install a mobile game and later see an ad for in-app items related to that game, that targeting is often powered by GAID-based attribution.


How GAID works

Here’s how GAID functions within the mobile marketing ecosystem:

  • Assignment: When a user sets up an Android device, Google Play Services automatically assigns a GAID.
  • Ad interaction: When users engage with ads (view, click, install), GAID is logged to connect their behavior with the campaign source.
  • Attribution: Advertisers and mobile measurement partners use GAID to track which campaign led to specific actions such as app installs or purchases.
  • Optimization: This data helps marketers refine targeting, adjust budgets, and deliver more relevant ads.
  • User control: Users can reset their GAID or opt out of personalized advertising altogether. If they opt out, the GAID becomes a string of zeros, effectively disabling tracking.

Why GAID has been important

For nearly a decade, GAID has been central to mobile advertising on Android. Its role has included:

Measurement and attribution

GAID links marketing efforts to user actions, showing which campaigns drive conversions. This helps advertisers allocate budgets effectively and improve ROI.

Audience segmentation

GAID enables marketers to group users by behavior, such as app usage or purchase activity, allowing for more targeted and relevant advertising.

Personalization

By analyzing user behavior through GAID, marketers can deliver personalized ads that align with users’ interests and habits.

Privacy control

Unlike older device IDs, GAID was designed with privacy in mind, allowing users to reset or disable tracking.


How to find your GAID

Users can locate their GAID on most Android devices by following these steps:

  • Open the Settings app.
  • Select Google.
  • Tap Ads under Services.
  • The Google Advertising ID will be displayed at the bottom of the screen.

You can also reset it anytime by selecting Reset advertising ID for a new GAID number.


The future of GAID and the rise of Privacy Sandbox

The advertising landscape is shifting toward privacy-first solutions, and GAID is gradually being phased out as part of Google’s Privacy Sandbox for Android initiative.

Announced in 2022, the Privacy Sandbox aims to reduce cross-app tracking while maintaining effective advertising and attribution through aggregated data and privacy-preserving APIs.

Key components replacing GAID include:

  • Attribution Reporting API: Measures ad performance without exposing user-level data.
  • Topics API: Replaces interest-based targeting with broad, on-device topic categories.
  • FLEDGE: Enables retargeting and audience-based advertising without external data sharing.

This evolution mirrors Apple’s ATT framework, emphasizing consent, transparency, and aggregated insights rather than user-level tracking.


Impact on marketers and developers

The shift away from GAID will change how marketers measure performance and target audiences. While data granularity will decrease, new privacy-safe APIs will still allow for campaign optimization and measurement through aggregated, anonymous signals.

Mobile Measurement Partners (MMPs) will play a key role in helping advertisers transition to these new frameworks while maintaining visibility into user behavior.


FAQs

What does GAID stand for?

GAID stands for Google Advertising Identifier, a resettable ID assigned to Android devices to track ad performance and attribution.

Is GAID the same as IDFA?

No. GAID is for Android devices, while IDFA (Identifier for Advertisers) is Apple’s equivalent for iOS devices.

Can I disable my GAID?

Yes. Users can reset or opt out of personalized ads in their device’s Google settings. If opted out, the GAID becomes a string of zeros.

Why is GAID being deprecated?

GAID is being replaced by privacy-preserving technologies under Google’s Privacy Sandbox, which focuses on user anonymity and reduced data sharing.

Will advertisers still be able to measure performance after GAID is gone?

Yes, but using new APIs like Attribution Reporting and Topics, which offer aggregated data while protecting user privacy.


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