In lead gen, the conversion Google sees, the form fill, is the start of the journey, not the end. The deal is won weeks later in your CRM, somewhere Google cannot see. So Smart Bidding optimizes for the only outcome it knows, and you get more leads that never close.
How it closes the loop
When someone clicks an ad, Google stores a click id (GCLID). Capture that id with the lead, and when the opportunity progresses or closes in your CRM, upload the outcome back against it with offline conversion import. Now Google knows which clicks became customers, not just which became contacts.
What changes
Feed bidding raw leads and it finds more lead-fillers; feed it qualified opportunities and it finds more buyers. This is the mechanism behind optimizing to a down-funnel conversion action, and it is how you stop a campaign from scaling cheap, junk volume.
What it takes
You need a click ID or the lead's email captured with every lead, an outcome stored in the CRM, and a way to upload it, manually on a schedule or through an integration. Google now recommends enhanced conversions for leads, an upgraded version of offline conversion import: capture the hashed email with the lead, and the GCLID wherever you have it, then upload through Data Manager or a CRM integration. It matches more leads than GCLID alone, including traffic where the click ID was lost. Pair it with Customer Match to also exclude the leads you have already disqualified.
Common questions
What is offline conversion import?
It uploads conversions that happen after the click, such as a qualified lead or closed deal, back into Google Ads, matched on the click ID (GCLID) or, with enhanced conversions for leads, on the lead's hashed email, so bidding can optimize toward real outcomes instead of form fills.
What do you need to set it up?
Capture the GCLID and the lead's email with each lead, store the outcome in a CRM, and upload conversions back against them, manually on a schedule or via an integration.