Google Ads Conversion Tag

## Why it matters

Without conversion tracking, you can't connect your ad spend to actual results. You might be getting clicks and traffic, but if you don't report which of those clicks turned into paying customers, you're flying blind on ROI. Google Ads needs to see the conversions so it can optimise your campaigns and bid toward actions that actually matter.

Every conversion tag you set up becomes a destination Google Ads can bid on. The more granular your tags (separate ones for free-trial sign-ups versus paid purchases), the smarter Google's automated bidding becomes.

## How it works

A conversion tag is a snippet of code that fires when someone completes a goal, such as finishing a purchase or submitting a contact form. The tag sends a request to googleadservices.com carrying the conversion ID (the AW-XXXXXXX number) and optionally a conversion label, value, and currency. Google Ads matches this request back to the original ad click to record the conversion in your account.

The conversion value is optional but powerful. A free-trial conversion might be worth 0 euros, while a paid purchase sends the actual revenue. Google Ads uses this value to calculate return on ad spend and to optimise bids.

Conversion tracking works via three main endpoints. Most sites use the global googleadservices.com/pagead/conversion endpoint. Some use Google's first-party endpoint at google.com/pagead/1p-conversion for enhanced privacy. Remarketing pixels on doubleclick.net also send conversion signals for view-through conversions.

## What does not matter

You don't need to fire the conversion tag on every page. It should fire only when the goal is completed. Firing it on your homepage or product page wastes conversion credits.

The conversion ID is not secret; it's often visible in your page source or network requests. What matters is the conversion label inside each tag, which ties a specific action to a specific campaign objective.

Conversion tracking works even if users have cookies disabled or are using a privacy browser; Google uses other signals to match conversions back to clicks. But you get better accuracy with cookies enabled.

## Code example

A conversion tag request to Google Ads looks like this:

GET /pagead/conversion/XXXXXXX/?cv=9&fuid=12345&value=99.99&currency_code=USD&label=purchase_7d8s HTTP/1.1
Host: googleadservices.com
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Breakdown: XXXXXXX is your conversion ID, cv=9 is the protocol version, value is the conversion value in your currency, and label ties this to a specific conversion goal in your Ads account. The fuid is Google's unique user ID.

Enhanced conversions pass first-party user data to Google:

POST /pagead/conversion/XXXXXXX HTTP/1.1
Host: googleadservices.com
Content-Type: application/x-www-form-urlencoded

conversion_id=XXXXXXX&conversion_label=purchase_7d8s&value=99.99&currency_code=USD&email=user@example.com
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## How Scalpel shows it

Scalpel Tags identifies any request to googleadservices.com/pagead/conversion or google.com/pagead/1p-conversion as a conversion tag and decodes the conversion ID and label. It groups the request with any other Google Ads activity on the page and flags it in the hit table so you can watch conversions fire in real time.