Hey! It’s Théo today. We’ll speak about the topic of tracking parameters in Google Ads, especially the ones that confuse even advanced marketers: GCLID, GBRAID, and WBRAID.

Since the rollout of Apple’s App Tracking Transparency (ATT), traditional tracking methods have lost their precision. But Google didn’t give up. They adapted. And if you’re running Paid Ads, understanding the difference between these three parameters can help you better attribute conversions, even in a privacy-first world.

Let’s dive into the logic behind these identifiers, how they work, and what they mean for your campaignsas Google Ads expert.

What Is GCLID in Google Ads?

GCLID stands for Google Click Identifier. It’s the original tracking parameter that Google uses to connect a specific ad click to a conversion.

Every time someone clicks on a Google ad, this unique ID is appended to the URL. It allows Google Ads and Google Analytics to tie the click to a keyword, audience, or campaign that drove it. This is the foundation of conversion attribution in the pre-iOS 14 era.

You’ll typically see GCLID in:

Desktop traffic

Android users

iOS users who opt in to tracking (rare)

But here’s the issue: GCLID relies on user-level data, which Apple’s iOS privacy framework now restricts. So on iOS devices, GCLID often gets stripped or blocked.

Why Did Google Introduce GBRAID and WBRAID?

To stay compliant with Apple’s privacy rules, Google introduced two new identifiers: GBRAID and WBRAID. Unlike GCLID, they don’t rely on user-level identifiers. Instead, they use aggregated data that respects user privacy.

This change allows Google to keep measuring performance and optimizing your campaigns even when personal identifiers can’t be used.

So if your traffic comes from iOS, you’re no longer tracking with GCLID but with one of these two new options depending on the journey.

What’s the Difference Between GBRAID and WBRAID?

Understanding the difference comes down to where the click starts and ends in the user journey.

GBRAID

Used for: Web-to-app tracking

Example: A user clicks a Google ad inside an iOS app, they visit your website, they convert.

In this case, GBRAID enables attribution from the app click to the web conversion, even without tracking individuals.

WBRAID

Used for: App-to-web tracking

Example: A user clicks a Google ad in Safari (web), they are redirected to download your app, they convert in-app.

Here, WBRAID allows for attribution from web click to in-app behavior while remaining ATT compliant.

These identifiers work without personal data, which makes them acceptable under Apple’s privacy framework. They rely on aggregated event measurement rather than deterministic matching.

How Are GBRAID and WBRAID Privacy Compliant?

Apple’s ATT framework forces advertisers to stop tracking individuals across apps and websites. Google’s solution respects this by avoiding any individual identifiers.

Here’s how:

No personal user IDs are tracked

Conversion attribution is based on aggregated data

The signals are designed to optimize at the group level, not the user level

This makes both GBRAID and WBRAID compatible with Apple’s guidelines while still delivering campaign insights and optimization signals.

Why This Matters for Paid Search and Performance Campaigns

If you’re running Paid Advertising, especially across multiple devices or iOS users, here’s why understanding these parameters is key:

Without proper attribution, you undercount conversions

Underreporting leads to under-optimization

Campaigns can appear less profitable than they really are

Knowing whether your campaigns are using GCLID, GBRAID, or WBRAID helps you analyze performance more accurately and adjust your bidding strategy accordingly.

For example:

Use GBRAID to attribute iOS in-app traffic going to a website

Use WBRAID to measure web clicks that end in iOS app installs

Use GCLID for everything else: Android, desktop, and opted-in iOS users

Key Takeaways

GCLID is the classic tracking ID used by Google Ads to follow clicks and measure conversions

Apple’s privacy rules forced Google to innovate. GBRAID and WBRAID were created in response

GBRAID = app to web (click inside an app, conversion on web)

WBRAID = web to app (click on web, conversion in app)

Both are aggregated, privacy compliant, and allow for campaign-level optimization even without user-level tracking