Custom Conversions let an advertiser create a trackable conversion event based on rules applied to existing Pixel or CAPI data — most simply, a URL match like 'any page containing /thank-you/' — without needing to add new tracking code to the website. They're a fast way to start measuring a specific outcome when full custom-event implementation isn't yet available.
Because Custom Conversions are rule-based rather than fired directly by a coded event, they can be less reliable if the underlying URL rule is loosely defined; agencies favor migrating a validated Custom Conversion into a properly coded standard or custom event once a funnel is confirmed to be stable and worth investing engineering time into.
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