Optimization Events

Link Clicks vs Purchase Optimization: When to Make the Switch

In short: Both can run in the same ad account, but they train Meta's delivery on completely different signals - one on taps, one on completed checkouts. Link Clicks needs no purchase history and will deliver to almost anyone; Purchase optimization needs a steady stream of purchase events to build a buyer model and won't stabilize without one. Link Clicks is a volume tool for early testing or non-ecommerce goals, while Purchase is the correct end-state for any store with real sales. Choose Purchase once your ad sets can sustain enough weekly purchases to leave learning; otherwise start with Link Clicks or a mid-funnel event and graduate up.

By the AdFlint research team · Fact-checked against current Google and Meta platform behavior · Last reviewed July 2026

Link Clicks Optimization

Tells Meta to spend your budget on people most likely to tap the link, regardless of whether the page ever loads.

Meta ranks users by predicted click probability and buys impressions accordingly. It fills learning fast because clicks are cheap and plentiful, so it suits new pages with no conversion history or pure traffic goals. The mistake is treating link clicks as demand: the system happily finds compulsive tappers who bounce before the page renders, inflating volume while sales stay flat.

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Purchase Optimization

Points Meta's delivery system at people predicted to complete a checkout, bidding for buyers rather than for clicks, sessions, or cart activity.

Meta needs a steady stream of purchase signals, from the pixel, the Conversions API, or both, to model who buys. It is the correct default for any store with real sales volume, since every shallower event is a proxy. The failure case is running it at a budget that cannot generate enough weekly purchases per ad set: delivery starves, the ad set never exits learning, and costs swing wildly.

Full definition

Side by side.

The differences that actually change what happens in your account.

	Link Clicks Optimization	Purchase Optimization
What the algorithm is trained on	Tap probability - nothing about the destination or what happens after.	Completed checkout probability, weighted by your pixel and/or CAPI purchase events.
Data prerequisite	None.	Enough weekly purchase events per ad set to leave the learning phase and stay stable.
Objective it sits under	Traffic.	Sales (conversion campaigns).
What a cheap result actually means	Low cost per click - tells you almost nothing about buyers.	Cost per purchase - tied directly to revenue, usually higher than a headline click cost.
Behavior at low budget	Still delivers fine, just produces low-value traffic.	Ad set starves or never exits learning if the budget can't generate enough weekly purchases.
Reporting depth	Click count and CTR only.	Purchase count, revenue, and ROAS, all tied to real pixel/CAPI conversion data.
Exposure to attribution loss	Essentially none - a click needs no cross-device matching.	Directly exposed to iOS tracking loss; relies on Conversions API to backfill what the pixel misses.

What actually separates them.

Link Clicks delivery decisions are made purely on click prediction, while Purchase delivery decisions come from a purchase-probability model built on pixel and CAPI events, so the two strategies can select entirely different audiences for the identical ad.

Purchase optimization needs a minimum flow of weekly purchase events per ad set to leave learning; Link Clicks has no equivalent threshold and can deliver stably from day one regardless of downstream sales.

Link Clicks lives under the Traffic objective while Purchase lives under Sales, so moving between them isn't a setting toggle - it typically means rebuilding the campaign under a different objective.

Because purchase events face iOS attribution loss, Purchase-optimized reporting can undercount real sales unless Conversions API is sending server-side purchase events to fill the gap; Link Clicks reporting has no equivalent gap since a click needs no cross-device matching.

An ad set can post an identical cost per click under both strategies while producing very different revenue, because Link Clicks has no mechanism to distinguish a buyer from a browser and Purchase optimization does.

Which one should you use?

Use Link Clicks Optimization when

You're running a non-ecommerce campaign - awareness, app-install groundwork, content promotion - where purchases were never the goal.
Your site is brand new with zero purchase history and you need traffic just to start generating pixel data.
Weekly purchase volume per ad set is too thin to feed Purchase optimization, and you haven't yet built up a mid-funnel event either.
You're sending traffic to a non-checkout destination - a blog, a lead magnet, an informational page.

Use Purchase Optimization when

You have consistent weekly purchase volume per ad set and a pixel or CAPI feed reliably reporting it.
You're past the testing phase and want Meta's algorithm finding actual buyers instead of clickers.
Revenue and ROAS, not click volume, are what you and stakeholders actually judge the campaign on.
You've already tried a mid-funnel proxy like Add to Cart and now have enough purchase data to move up a level.

Common questions.

Why did my cost per result explode when I switched from Link Clicks to Purchase?

You're comparing two different units - cost per click versus cost per purchase - so a jump is expected and not necessarily bad. Judge cost per purchase against your margin, not against your old cost per click, to see whether the campaign is actually working.

How many purchases do I need before Purchase optimization works well?

Meta doesn't publish a hard number, but the practical signal is whether your ad set consistently exits the learning phase instead of resetting or stalling. If weekly purchases per ad set are too sparse, consolidate ad sets or raise budget, or step down to a mid-funnel event like Add to Cart until volume builds.

Can Link Clicks traffic still convert into purchases later?

Yes, but the algorithm isn't selecting for people likely to buy, so purchase rates from Link Clicks traffic tend to be weaker and less predictable than from Purchase-optimized traffic. Treat any resulting sales as a bonus, not proof the strategy is efficient.

Is it ever fine to run Link Clicks permanently instead of graduating to Purchase?

Only if purchases genuinely aren't the campaign's job, such as a pure traffic or awareness play. If the site sells things and has real purchase volume, staying on Link Clicks indefinitely leaves revenue-relevant signal unused that Purchase optimization would put to work.

Or stop choosing between them.

AdFlint picks the setting, writes the ads, and keeps optimizing inside the Google and Meta accounts you already own.

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