The Google advertising ID is a device identifier which marketers can use to track the ad behavior of users anonymously on Android devices. Sometimes, this is referred to as the Android advertising ID, although the more frequently used term is Google advertising ID, short for GAID.
The GAID or Android advertising ID is similar to a third-party cookie on the internet.
Adverts have used third-party cookies that keep track of what the user of a specific web browser is doing concerning his/her adverts on several different websites. A similar functionality provided by Google is the Advertising ID, as this will alert an advertiser about how many times a particular ad was viewed or an app opened.
One of the most commonly recorded conversions in such a tool as the Google Advertising ID is app installations.
The GAID, or Google Advertising ID, has a long history.
Advertisers want to be able to link ad views to specific activities. Cookies provided that role in desktop web browsers before smartphones became the major mode of internet access.
Advertisers might place a cookie on a webpage or in an ad and then track the efficacy of the ad. On the other hand, cookies fail miserably in this mobile world; they work within web browsers and not within mobile applications, and we spend most of our time using a mobile phone within an app, not a web browser.
Additionally, cookies have a very short lifespan… anything between one to thirty days.
Therefore, the GAID, or Google advertising ID, replaced cookies in mobile advertising sent to Android smartphones, just like the IDFA did on iOS devices. Marketers use it to link anonymous app installations or purchases to specific users.
The benefit for advertisers with Google advertising IDs, unlike cookies, is that they are semi-permanent device identifiers that only change if the consumer makes a deliberate action in the settings of their Android device.
Because very few customers do so (less than 5% in the United States), Android advertising IDs can form a more robust foundation for a permanent and anonymised consumer profile at least partially based on ad interaction data.
GAID and Privacy (and IDFA)
Consumer privacy is becoming increasingly important. Misuse of advertising IDs and trackers has caused significant problems, and regulations such as GDPR and the CCPA-the California Consumer Privacy Act limited how marketers may collect and use data. The big platforms, especially Apple, have acted to limit the amount of data that can be collected digitally from users.
To many people’s surprise, the IDFA and Android advertisement ID were privacy-oriented identifiers. In the case of Android, Android ID or ANDI and the case of iOS, Unique Device Identifier or UDID, both served to replace permanent device ID.
Before Google invented the advertising ID, permanent and unchanged device ID allowed advertisers to follow activities on an Android phone. Because consumers could toggle off or vary the value of the Android advertising ID, this offered more choice and privacy on the part of the consumer over a permanent device ID.
This notwithstanding, the rise is becoming increasingly concerning because advertising identifiers such as GAID and IDFA have been seen to result in severe instances of privacy abuses.
Due to these concerns, Apple has made IDFA opt-in while making SKAdNetwork available as a privacy-safe alternative. Google hasn’t indicated what it plans to do about the Android advertising ID, but the Google Play Install Referrer is one of many potential successor technologies already in place.
Using the Google Advertising ID (GAID)
When consumers take actions in response to ads, such as clicking on a banner in an app, watching a video in an app, or installing an app, ad networks can report information to the Android advertising ID about consumer activity.
This is called attribution, and it assigns behaviors, such as conversions, to stimuli, such as ads.
Most media houses pass Android advertising IDs. Some media companies, including the most popular social media, do not pass device IDs to marketers but allow you to target specific IDs within their services.
Trackier helps marketers to determine the effectiveness of their marketing and come up with an effective customer profile in a bid to know the target customers.
Google advertising ID Explained (and What Replaces It in 2026)
For years, the Google Advertising ID (GAID) has been a core part of mobile attribution on Android.
It is a unique device identifier that helps marketers track installs, measure campaign performance, and attribute conversions across channels. Even today, GAID continues to support many attribution workflows across the Android ecosystem.
However, the system is not the same as it were a decade ago, and GAID alone is no longer enough.
Why GAID is losing relevance?
The shift toward privacy-first advertising has changed how tracking works.
- Users have more control over their data
- Platforms are limiting cross-app tracking
- Advertisers are facing increasing signal loss
To address this, Google introduced new privacy-first frameworks that reduce reliance on identifiers like GAID.
For example, privacy-preserving APIs such as the Attribution Reporting API are designed to measure conversions without exposing user-level data.
Similarly, approaches like the Topics API enable interest-based targeting without tracking users across apps.
From deterministic, user-level tracking → to aggregated, privacy-safe measurement
What replaces GAID?
There is no single replacement for a Google advertising ID.
Instead, the industry is moving toward a combination of approaches:
1. Privacy-first attribution
Attribution is becoming:
- Aggregated
- Delayed
- Modeled
Ensures performance measurement without exposing individual user journeys.
2. Cohort and contextual targeting
Instead of identifying users, systems now focus on:
- Content context
- Broad audience cohorts
Reduces dependency on device-level identifiers.
3. First-party and server-side data
Marketers are increasingly investing in:
- First-party data strategies
- Server-side tracking infrastructure
Creates more control and resilience in a privacy-first ecosystem.
4. Hybrid attribution models
Modern measurement combines:
- Deterministic signals (like GAID, where available)
- Probabilistic modeling
- Aggregated reporting
Relying on a single identifier is no longer sustainable.
Today, GAID is still here, but nothing’s the same.
Google Advertising ID is not fully deprecated.
It continues to exist and support attribution, but its role is gradually diminishing as privacy-first technologies take center stage.
- GAID-based tracking still operates
- Privacy-first frameworks are rapidly gaining adoption
What does this mean for YOU?
To stay ahead, marketers need to:
- Move beyond single-ID dependency
- Adopt multi-signal attribution
- Build privacy-compliant tracking frameworks
Stay at the top of your game with Apptrove, Trackier’s own MMP
In a post-GAID world, attribution is all about connecting multiple signals into one unified view.
Trackier enables this by offering:
- Hybrid attribution models
- Server-side tracking capabilities
- Privacy-compliant measurement frameworks
So whether GAID is available or limited, your attribution remains accurate and scalable.
Ready to move beyond GAID?
If you’re looking to future-proof your mobile attribution strategy, it’s time to adopt a privacy-first approach.
Explore how Apptrove by Trackier helps you track, measure, and scale, without relying on a single identifier.
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