Google Ads Ad Strength: what it measures, pinning and when to ignore it

Google Ads Ad Strength is a rating from Incomplete to Excellent that tells you how well the headlines and descriptions in a responsive search ad (RSA) follow Google's best practices for relevance, quantity and variety. It is a diagnostic for the ad-building screen, not an auction input: Google's help documentation states that Ad Strength does not decide whether an ad is eligible to serve and is not used to calculate Ad Rank, Quality Score or auction wins.

That second sentence is often misunderstood. A "Poor" label does not switch your ad off, and an "Excellent" label does not buy you a cheaper click. What the rating does do is point at weaknesses that often do affect results, such as headlines that repeat each other or never mention the keywords you bid on. This guide explains what the google ads ad strength score measures, how pinning changes it, how to raise it without wrecking your message, and when the sensible choice is to leave it alone.

What Ad Strength measures

Responsive search ads work differently from the old fixed text ads. You supply a pool of assets, up to 15 headlines of up to 30 characters each and up to 4 descriptions of up to 90 characters each, and Google's system assembles combinations at auction time. A single impression can show up to three headlines and up to two descriptions. Because the system is mixing parts, it needs parts that make sense in many orders and that give it real choices.

Ad Strength scores how well your pool supports that mixing. According to Google's help page, it mainly looks at the relationship between your assets and the keywords in the ad group. The main factors are:

• Keyword relevance. Whether your headlines and descriptions include or closely relate to the keywords you target. Popular keywords from the ad group showing up in headlines is one of the most common suggestions in the action items.
• Quantity. How many headlines and descriptions you supply. Google recommends using as many as you reasonably can, because more assets create more possible combinations.
• Uniqueness. Whether the assets say different things. Ten headlines that reword the same offer count for less than ten that each carry a distinct idea: a product, a benefit, a price point, a proof point, a call to action.
• Pinning. How much you have restricted where assets can appear. Covered in its own section below.

Google's current help page also counts sitelinks toward the evaluation: having 6 or more sitelinks available at the account, campaign or ad group level improves the score.

The ratings and where to find them

There are five labels. The table below lists them with what each one is telling you in plain terms, based on how Google describes the tool.

You see the rating in two places. While you create or edit an RSA, an indicator in the ad editor updates as you type and lists action items, such as suggestions to add more headlines, include popular keywords in headlines or make headlines more unique. After the ad is saved, you can add the "Ad strength" column to the Ads table at campaign or ad group level and sort by it to spot the weakest ads in an account.

The action items are the useful part. The overall label is a summary; the items tell you which specific change would move it.

Does Ad Strength affect the auction or Quality Score?

No, not directly. Google's documentation is explicit that Ad Strength does not determine whether your ad is eligible to serve and is not used to calculate Ad Rank, Quality Score or auction wins. Quality Score is a separate diagnostic, reported at keyword level on a 1 to 10 scale and built from expected click-through rate, ad relevance and landing page experience. The two tools are often confused because both talk about "relevance", but they are calculated separately and used for different things.

There is an indirect link worth understanding. The things Ad Strength rewards, such as keyword-relevant headlines and a wider variety of assets, can also help the ad earn clicks and look more relevant to a search. Better click-through rate and ad relevance feed into Quality Score and into the live auction. So a weak Ad Strength rating can sit next to weak performance without being the cause of it. Treat the rating as a hint about the asset pool, then confirm with real metrics.

One more practical point: an ad that cannot serve has a different problem. Disapprovals, limited policy status, a missing keyword list or a paused ad group stop delivery. Ad Strength never does.

How pinning changes the score

Pinning lets you fix a headline or description to a specific position. Pin a headline to position 1 and that headline appears first in every impression. Pinning is useful when something must always show: a legal disclaimer, a regulated product name, a brand line required by a franchise agreement.

The cost is flexibility. If you pin one headline to position 1, the system has only one option for that slot instead of all of your headlines. Google's guidance is to avoid pinning unless necessary, because it limits the combinations the system can test, and Ad Strength usually drops when you pin heavily.

If you must pin, a common way to soften the effect is to pin two or three alternative headlines to the same position. The system then rotates among them for that slot instead of showing one fixed line. For example, if position 1 must mention the brand, write three different brand headlines and pin all three to position 1. Pinning several near-identical assets to the same position does not help much, because they give the system little real choice.

How to improve Google Ads Ad Strength step by step

The fastest improvements come from working through the action items in a set order. This sequence avoids rewriting the whole ad.

1. Check the keyword list first. Ad Strength judges relevance against the ad group's keywords. If the ad group mixes unrelated themes, no set of headlines can fit all of them. Split the group before editing copy.
2. Fill the headline slots. Aim for 10 to 15 headlines. If you have only five, the action items will almost always ask for more.
3. Put the main keywords into several headlines. Use the exact service or product terms people search for, written naturally. Two or three headlines that carry the core keyword are usually enough; the rest can carry other angles.
4. Give each headline a separate job. One states the offer, one a benefit, one a price or promotion, one a proof point such as years in business, one a location, one a call to action. Avoid headlines that differ by a single word.
5. Vary length. Mix short headlines with ones close to 30 characters so the system has options for different layouts.
6. Write all four descriptions. Each up to 90 characters, each able to stand alone, because any description can appear with any headline.
7. Review pins. Remove pins that are not legally or contractually required. Where a pin is required, add alternatives to the same position.
8. Read the combinations. Use the ad preview to see how assets read together. A headline that only makes sense after another headline is a problem, because order is not guaranteed.

A short illustrative example: an ad group for "teeth whitening Bangkok" has six headlines, all variations of "Professional Teeth Whitening". The action items flag the low count and repetition. Rewriting to twelve headlines, with the keyword in three of them and the others covering appointment booking, treatment time, aftercare and a call to action, typically lifts the rating because the pool now has relevance and variety. The numbers here are an example of the process, not a benchmark.

When to ignore Ad Strength

Ad Strength is a best-practice checklist, and best practice is not the same as best result. There are clear cases where accepting a lower rating is the right call.

• Regulated industries. Finance, healthcare and legal advertisers often need fixed wording or disclaimers in a set position. Pinning those lines lowers the score but keeps the ad compliant. Compliance wins.
• Brand campaigns. A brand search ad may only need to confirm who you are and where to click. Fifteen varied headlines add little when the searcher already typed your name.
• Proven ads with strong results. If an "Average" ad converts well at an acceptable cost, rewriting it to chase "Excellent" risks the results you already have. Test a new version alongside it instead of replacing it.
• Keyword stuffing. Forcing the same keyword into every headline can raise the rating while making the ad read badly. Searchers click on clear, useful copy, not on keyword density.

The sound approach is to use Ad Strength while building, then judge the ad by conversions, cost per conversion, click-through rate and conversion rate once it has run. If a "Good" ad beats an "Excellent" one on those numbers, keep the "Good" ad.

How to test changes properly

Because the rating is not a performance metric, the only way to know whether an edit helped is to measure it. Editing an existing ad's text generally creates a new ad with fresh statistics, so many advertisers prefer to add a second RSA to the ad group with the revised assets and let both run. Google recommends having at least two RSAs rated Good or Excellent in each ad group, and you can run more than one RSA per ad group.

Give the test enough time and data before deciding. With low-volume ad groups, a few weeks of data is often too little to tell the difference. Compare conversions and cost per conversion as well as click-through rate, since a catchier ad can draw more clicks from the wrong people. The asset report, which shows how often each headline and description served, also helps: assets that rarely serve are candidates to replace.

What this means for Thai marketers

Thai-language RSAs bring a few extra considerations. Thai is written without spaces between words, and the 30-character headline limit is counted in characters, so a Thai headline can carry a different amount of meaning than an English one of the same length. Preview every Thai headline before saving to check it fits and reads naturally.

Many Thai searchers type a mix of Thai and English, for example a brand or product name in English with a Thai service word. If your ad group keywords include both forms, write headlines in both, so the relevance check and the searcher both see a match. Keep separate ad groups for Thai and English keywords where the language of the query is clear, so each ad's assets match its own keyword list. Read your previews in mobile format too, where fewer headlines may show.

FAQ

Does a Poor Ad Strength rating stop my ad from showing?

No, a Poor rating does not stop an ad from serving. Google states that Ad Strength does not determine serving eligibility; delivery is limited by policy status, bids, budgets, targeting and the auction itself.

Is Ad Strength the same as Quality Score?

No, they are separate diagnostics. Quality Score is a keyword-level 1 to 10 estimate based on expected click-through rate, ad relevance and landing page experience, while Ad Strength rates the asset pool of a responsive search ad and is not used in Quality Score.

How many headlines do I need for Excellent?

There is no fixed count that guarantees Excellent, but Google recommends supplying as many unique headlines as you can, up to 15, along with up to 4 descriptions. Relevance to your keywords and variety between assets matter as much as the number.

Should I remove all pins to raise Ad Strength?

Only remove pins that are not required. If a disclaimer or fixed brand line must appear in a set position, keep the pin and add alternative assets pinned to the same slot so the system still has options.

Can an Average ad outperform an Excellent one?

Yes, an Average ad can deliver better results. Ad Strength measures adherence to best practices, not actual conversions, so always compare ads on conversions and cost per conversion before deciding which to keep.

Getting responsive search ads right

Ad Strength is a useful prompt while you build an ad and a poor reason to rewrite one that already works. Use it to catch thin, repetitive or off-keyword asset pools, then let real performance data decide. If you want a team to audit your responsive search ads, ad group structure and conversion tracking together, Relevant Audience's Google Ads management service covers that work, and the Relevant Search programme for Google Ads focuses on search campaigns specifically. Strong ads also need pages that match them, which is where landing page design comes in, and reliable measurement through a proper GA4 setup makes every ad test easier to read.