How Quality Score actually works
Quality Score is a diagnostic Google reports at the keyword level, from 1 to 10, that summarises how well your ad and landing page match the intent behind a search. It is not itself the number used in the live auction; that is Ad Rank, which combines your bid with a real-time quality assessment. But the reported Quality Score is a faithful proxy for that assessment, which is why treating it as a health gauge works. A cluster of 3s and 4s is Google telling you the account structure is fighting the searcher's intent.
The three components that build it
Quality Score is assembled from three inputs, each rated below average, average, or above average. Expected click-through rate predicts how likely your ad is to be clicked when it shows. Ad relevance measures how closely your ad copy matches the keyword's intent. Landing page experience judges whether the page is relevant, fast, and easy to use. The first two are won in account structure and copy; the third is won on the site. All three have to be healthy, because one below-average component drags the whole score down.
Why a high Quality Score lowers your CPC
The auction rewards relevance with a discount. Because Ad Rank divides roughly by a quality factor, a well-scored keyword can hold the same position as a competitor while paying meaningfully less per click, or outrank them at the same bid. This is the mechanism that makes Quality Score a budget lever, not a vanity metric. iClick treats a low Quality Score as money left on the table: every point of improvement is a position you can hold more cheaply, which compounds across every click the keyword ever earns.
How to improve Quality Score
The durable fix is structural, not cosmetic. Tighten ad groups so a small set of closely related keywords shares ad copy written for exactly that intent, which lifts both expected CTR and ad relevance at once. Point each ad group at a landing page that continues the ad's promise and loads fast on mobile. Prune the broad or mismatched keywords pulling irrelevant impressions. iClick rebuilds sprawling ad groups into tight themes before ever raising a bid, because relevance is almost always cheaper than budget.
