Quality Score is a diagnostic metric used in Google Ads search campaigns to help understand how well a keyword aligns with the ad, landing page and user search intent. It is shown on a scale from 1 to 10 and is evaluated at the keyword level. A higher Quality Score indicates that your ad and landing page may be more relevant and useful to users searching for that keyword compared with other advertisers.
Quality Score should not be treated as a direct performance metric or as a value used directly in the ad auction. In Google Ads auctions, ad ranking is determined by many factors, including bid, ad quality, auction-time signals, ad assets and competitive conditions. Quality Score is mainly used to understand which areas of your ads, keywords and landing pages may need improvement. Therefore, it is not a success metric on its own, but a diagnostic tool that guides optimisation.
Quality Score is based on three main components: expected click-through rate, ad relevance and landing page experience. Expected click-through rate estimates how likely users are to click your ad when it is shown. Ad relevance shows how closely your ad text matches the intent behind the user’s search. Landing page experience evaluates how relevant, useful, transparent and usable the page is after the user clicks the ad.
To improve expected click-through rate, ad copy should be clear, strong and aligned with user intent. There should be a natural connection between the keyword and the ad headline, and the solution the user is looking for should be clearly communicated in the ad text. For example, if a brand selling mother and baby products wants to appear for the search “organic baby romper”, the ad text should clearly mention that product group. However, simply adding high-volume keywords to ads is not enough; the keyword, ad and landing page should all serve the same intent.
To improve ad relevance, the campaign and ad group structure should be built properly. Grouping keywords with very different intents under the same ad group can make it difficult for ad copy to appear sufficiently relevant. Instead, keywords with similar search intent should be grouped together, and more targeted ad copy should be created for each group. This helps create a stronger connection between the user’s search query and the ad message.
Landing page experience is also critical for Quality Score. When users click on an ad, they should be able to quickly and easily reach the product, service or information promised in the ad. The landing page should match the ad message, work well on mobile, load quickly, build trust and help the user complete the expected action easily. Long forms, slow loading speed, irrelevant content or unclear information about pricing and delivery can weaken the landing page experience.
Negative keywords are also important optimisation tools that support ad quality. Preventing ads from showing for irrelevant queries helps use budget more efficiently and match ads with more relevant users. For example, a brand that only sells new products may add terms such as “second-hand”, “free” or “repair” as negative keywords. This structure can improve click quality and reduce traffic with low conversion potential.
If Quality Score is low, all three components should be reviewed together rather than focusing on only one area. If expected click-through rate is low, ad copy, offer strength and ad assets can be reviewed. If ad relevance is low, keyword grouping and ad messaging can be restructured. If landing page experience is low, page speed, content relevance, mobile usability, trust signals and conversion flow can be improved.
In summary, Quality Score is an important diagnostic indicator that helps evaluate ad quality in Google Ads search campaigns. When interpreted correctly, it shows which keywords, ad texts or landing pages may need improvement. However, Quality Score alone does not determine campaign success; it should be evaluated together with business outcomes such as conversion rate, CPA, ROAS, lead quality, revenue and profitability.
