How to track webinar registration to attendance for Google Ads
Registrations are easy to buy and attendance rates vary enormously by channel, which makes registration a poor optimization target and attendance a genuinely useful one. The complication is timing: the webinar happens days after the click, on a platform you don't own, and the attendance record lives there rather than on your site. On Google Ads the specifics that matter are the click identifier (gclid, gbraid and wbraid), the import mechanism (Google's offline conversion import), and conversion actions deduplicate on their own counting setting rather than an event ID, so the setting matters more here than the payload. The chain only works end to end if the identifier is captured on landing and stored on the registrant record in your webinar platform and CRM — no cookie survives the gap between ad click and attendance sent back.
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Specific to Google Ads × Webinar registration → attendance
Google Ads webinars: import attendance as the primary action
On Google Ads, store the gclid, gbraid or wbraid on the registrant record through a hidden field, then import attendance as an offline conversion from your webinar platform's data, counted once per click. Keep registration as a secondary action. Enhanced Conversions for Leads can match on the registrant's hashed email when the click ID is lost.
Webinar funnels suit Google's import better than most because every registrant gives an email. That makes Enhanced Conversions for Leads a strong fallback: hash the registration email, send it with the registration, and Google can match the later attendance upload even when the click ID never made it onto the webinar platform. Check that your setup meets Google's customer data requirements before enabling it.
Most webinars run within a few weeks of the click, so attendance lands inside the 90-day window with plenty of room. The build choice is about volume. If a webinar series produces enough attendees each month, make the attendance action primary and let tCPA or Maximize conversions bid on it. If one webinar a quarter produces a few dozen attendees, bidding has too little to learn from, so keep registration primary with a low value and import attendance as secondary for reporting and audience building.
Set both actions to count one per click. Registrants who sign up for three sessions in a series, or register twice with the same email, otherwise inflate both numbers. If your platform reports watch time, import a separate 'watched most of the session' action with a higher value than plain attendance, which separates people who stayed from people who joined and left.
Google Ads · Webinar registration → attendance · what breaks
Where this funnel usually breaks — Google Ads · Webinar registration → attendance
- 01
The identifier doesn't reach the registration
Webinar platforms are usually a different domain. It has to be passed as a hidden field or link parameter.
- 02
Registration optimized as the conversion
Attendance rates differ by a wide margin between channels, and registration-optimized bidding finds the worst of them.
- 03
Attendance never sent back
The platform exposes the webhook and most setups never wire it, so the useful signal stays inside the webinar tool.
Google Ads · Webinar registration → attendance · the fix
What working looks like — Google Ads · Webinar registration → attendance
Attendance sent back attributed to the click
Weeks later if necessary, because the identifier lives on the registrant record in your webinar platform and CRM rather than in a cookie.
Google Ads bidding fed the real outcome
Via offline conversion import, so it optimizes toward people who attend rather than toward registrations.
A reconciliation that closes
Your webinar platform's attendance records matched per record against what Google Ads reports, over a fully closed window.
Google Ads · Webinar registration → attendance · architecture
The exact event sequence — Google Ads · Webinar registration → attendance
The gap between stages two and three is days, which is short enough to stay inside every import window and long enough to break cookie-based approaches.
- 1
Ad click
Identifier captured on landing and written into the registration.
- 2
Registered
The form event. Cheap, plentiful, and a weak predictor on its own.
- 3
Attended
Days later, from the platform's webhook. This is the event worth optimizing toward.
- 4
Watched past a threshold
Where the platform reports it — a much stronger signal than merely joining.
- 5
Attendance sent back
Uploaded against the original click, so bidding learns which channels produce people who show up.
Google Ads · Webinar registration → attendance · diagnose
What's specific to Google Ads
- 01
Click identifier: gclid, gbraid and wbraid
Three parameters, not one. gclid is the long-standing identifier; gbraid and wbraid arrive on iOS traffic where privacy constraints prevent the usual one. Capture code that names only gclid loses a growing share, silently, and the loss is invisible until you audit how many records carry an identifier.
- 02
Import mechanism: offline conversion import
Uploaded against the click identifier, either through the Google Ads API or as a file. The upload is the easy part; what limits it is how many of your records carry an identifier at all. Verify the current column format against Google's own template — it has changed before.
- 03
Deduplication
There's no shared event ID mechanism like Meta's. What matters instead is the counting setting on each conversion action — 'one' for lead-type conversions so a repeat submitter doesn't count three times, 'every' for ecommerce where a second purchase is a second sale. This is the single most common misconfiguration we find in Google Ads accounts.
- 04
Window and timing
Google's offline import window is 90 days from the click. Anything older can't be matched, and rows outside it fail as unmatched without much explanation. Measure your median click-to-outcome time against that before designing anything.
- 05
The Google Ads gotcha
A conversion action that stops receiving hits is flagged as inactive 30 days later — by which point a month of budget has already run against a missing signal. Check the last-received date on every action monthly; it takes two minutes and it's the cheapest monitoring available.
Google Ads · Webinar registration → attendance · prove
How to prove the chain works — Google Ads · Webinar registration → attendance
Source of truth
your webinar platform's attendance records
- The same identifier confirmed on the registrant record in your webinar platform and CRM after a full real journey through every step.
- Attendance sent back confirmed arriving at Google Ads, verified by the match rate on the upload, not the success message.
- Your webinar platform's attendance records reconciled against Google Ads per record over a fully closed window.
Google Ads · Webinar registration → attendance · free audit
What we check in the free audit
- Click identifier: gclid, gbraid and wbraid
- Import mechanism: offline conversion import
- Deduplication
- Window and timing
- The Google Ads gotcha
Checked against
your webinar platform's attendance records
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Google Ads · Webinar registration → attendance · when not to buy
When this doesn't apply to you — Google Ads · Webinar registration → attendance
- If your webinars are evergreen and on-demand, there's no scheduled attendance event to send. That's closer to a content-consumption funnel and wants a different treatment.
- If you're running Performance Max exclusively and haven't separated your conversion actions, the import will work and the reporting won't tell you much. Worth sorting the account structure first.
- If your cycle from click to attendance sent back regularly exceeds the import window, the final event can't drive bidding whatever you build. Optimize toward registration with a qualification flag instead and use the later data for budget decisions rather than for bidding.
- If almost none of your registrant records carry a click identifier today, that's the whole project.
Google Ads · Webinar registration → attendance · what we deliver
The implementation, on Google Ads
Capture gclid, gbraid and wbraid on landing
Auto-tagging appends the identifier. Confirm it's enabled in every account — it gets switched off for cleaner analytics URLs more often than you'd expect, and that single setting removes conversion attribution, Enhanced Conversions and offline import in one go.
Persist it to the registrant record in your webinar platform and CRM
Write it into the registration form as a hidden field, so it's on the registrant record before the webinar happens.
Send attendance sent back from the record
The webinar platform's attendance webhook fires after the session, carrying the registrant reference. Dispatched to Google Ads through Google's offline conversion import.
Deduplicate and reverse
Conversion actions deduplicate on their own counting setting rather than an event id, so the setting matters more here than the payload. Not usually applicable — attendance either happened or it didn't. Duplicate registrations should be deduplicated on the registrant record.
FAQ
Google Ads · Webinar registration → attendance questions, answered
Only until attendance volume is high enough to bid on. Once it is, make attendance primary and demote registration to secondary.
Often yes, through Enhanced Conversions for Leads using the hashed registration email. Without it, a lost click ID means the attendance can't be matched.
Because attendance rates differ by an order of magnitude between channels. A channel producing cheap registrations that nobody attends looks like the best performer you have.
It doesn't, as a cookie — the gap is too long. It has to be written onto the registrant record in your webinar platform and CRM at the point of ad click, where it lives as a field rather than as browser storage.
A click identifier inside the 90-day window, a conversion action name that matches one configured in the account, a conversion timestamp for when the outcome happened, and a value. Read the match rate after uploading — a file can upload perfectly and match nothing.
Two to four days for the implementation, plus a closed reconciliation window before we'd call it verified. Capture and persistence are the fiddly parts; the import itself is usually an afternoon.
Yes, and the reference pages on this site cover the mechanics. The part that's genuinely tedious rather than clever is keeping gclid, gbraid and wbraid alive through multi-step forms and a registration form hosted on the webinar platform's own domain, which fails silently at every stage.
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