What Is a GCLID? Google Click ID Explained

What is a GCLID? It is the code Google adds to your ad's link so a later job can be tied to that click. Here is where it lives, what it unlocks and what breaks it.

What Is a GCLID? The Definition

GCLID stands for Google Click Identifier. When auto-tagging is on in Google Ads, every click on your ad gets a long code added to the link, like ?gclid=EXAMPLE123. That code names one click.

What It Makes Possible

If you save the code when the customer calls or books, you can report the job back to Google later, with the money it paid. Google then knows that this click became a paid job. That report is an offline conversion.

The Life of One Click ID

Someone clicks your ad. The link carries the code.
The code is saved when the customer calls from a tracked number or fills a form.
The call or form becomes a job. HeadHoncho ties the click to the job by phone number and time.
The job is booked, then paid. The code goes back to Google with the value.

Worked Example

Example. A homeowner clicks your ad on Monday and calls a tracked number. The call saves click code EXAMPLE123. Tuesday the ticket is opened for the same phone number. Friday the job is paid, $1,100 after the sub. Google receives: click EXAMPLE123, a paid job, $1,100.

What Breaks It

Auto-tagging is off. No code is added at all.
The page strips it. A redirect or a cached page can lose the code before your form sees it.
Blocked scripts. The tool that saves the code never runs.
The customer never touched the ad link. A number off the side of a van or a call from your Business Profile carries no code.
Time. Google no longer accepts a click more than 90 days old.
Retyping. One wrong character and the code matches nothing.

How It Is Usually Miscounted

People assume every call has a GCLID. It does not. Some calls can never be traced, and an honest report says how many. HeadHoncho prints that coverage on the screen.

Offline conversion, ROAS. Walk the whole chain in Tracking a Lead All the Way to the Job, or do the upload yourself in the offline conversion tutorial.