Ad Grants Getting Started: CTR Maintenance and Keyword Design Fundamentals

Google Ad Grants is a powerful program that provides nonprofits with $10,000 per month in free search advertising. However, to maintain this benefit, organizations must keep their account-wide CTR (Click-Through Rate) at 5% or higher every month. Two consecutive months below this threshold results in automatic account suspension.

A CTR of 5% exceeds the typical average CTR for Google Search ads (approximately 3-4%), and it cannot be achieved without a deliberate strategy. So what determines success or failure? The answer is keyword design.

Keyword design is the process of deciding which search terms will trigger your ads. Get this wrong, and irrelevant searches will accumulate impressions without clicks, causing CTR to plummet. Get it right, and maintaining 5% CTR becomes manageable. In ISVD's own operations, a keyword design overhaul improved CTR from 4.8% to 9.1%.

This article builds on the Ad Grants fundamentals covered in our B-2 article and provides practical keyword design techniques for CTR maintenance. It serves as a preventive companion to the common rejection patterns discussed in B-5.

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The Short Keyword Trap

The most common mistake in Ad Grants operations is bidding on 1-2 word broad keywords such as "nonprofit," "donate," or "volunteer." These keywords present several problems.

Single-word keywords are prohibited under Ad Grants policy, and overly generic terms like "donate" or "volunteer" are also restricted. Google implements this rule precisely because such keywords drive CTR below acceptable levels.

Why 3+ Word Keywords Work

Long-tail keywords are specific search phrases consisting of three or more words. The logic behind their effectiveness is straightforward:

Clear search intent -> High ad relevance -> More clicks -> Higher CTR

Here are concrete keyword design examples:

How to Find Keyword Candidates

Three tools are particularly useful for discovering effective long-tail keywords:

1. Google Ads Keyword Planner: Check monthly search volume and competition level. Keywords with "low" to "medium" competition are well-suited for Ad Grants
2. Google Search Console: Identify keywords already driving traffic to your site and reinforce them with ads
3. Search Terms Report (within Google Ads): Review actual user search queries and add high-CTR terms as new keywords

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Why Negative Keywords Matter

Negative keywords are settings that prevent your ads from showing for specific search terms. For CTR improvement, excluding bad keywords is equally or more important than adding good ones.

The mechanism is simple. If you bid on the keyword "child poverty support," your ad may also appear for "child poverty support essay writing." This search is from a student writing a report, not someone seeking nonprofit services. When impressions from non-target searches accumulate, CTR inevitably drops.

Categories of Keywords to Exclude

Negative keywords should be managed systematically across the following categories:

Setup Process and Operational Cycle

Follow these steps to implement negative keywords:

1. Create an initial list: Compile 30-50 negative keywords from the categories above that are relevant to your organization
2. Create an account-level exclusion list: Navigate to Google Ads "Shared Library" -> "Negative Keyword Lists" to create a shared list and apply it across all campaigns
3. Weekly search terms report review: Review the search terms report each week, adding low-CTR and irrelevant queries to the exclusion list

After 4-6 weeks of this operational cycle, unnecessary impressions will decrease significantly, and CTR will show visible improvement.

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The One-Theme-Per-Group Principle

Ad groups should be structured following the "one theme = one group" principle. Mixing different themes in a single ad group reduces the relevance between ad copy and keywords, leading to lower Quality Scores and declining CTR.

For example, an NPO focused on child poverty might structure groups as follows:

Keyword Count Guidelines

Each ad group should contain 15-20 keywords as an optimal target.

• 5 or fewer: Insufficient data for optimization
• 15-20: Balances adequate data volume with manageability
• 30 or more: Themes tend to scatter, reducing ad copy relevance

For match types, prioritize phrase match and exact match. Broad match tends to trigger ads for unintended searches and should be used cautiously in Ad Grants operations.

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How Responsive Search Ads Work

Responsive Search Ads (RSA) are an ad format where you provide up to 15 headlines and 4 descriptions, and Google's machine learning automatically selects the best combination for each search query. Ad Grants requires at least one RSA per ad group.

Headline and Description Design Principles

Follow these principles to maximize RSA effectiveness:

Headlines (maximum 15, up to 3 displayed at a time):

Descriptions (maximum 4, up to 2 displayed at a time):

• Write all 4 from different angles (activities, track record, target audience, action prompt)
• Include a CTA in each description ("Contact us today," "Start with a free consultation," etc.)
• Use at least one description's full 90-character limit to convey the organization's mission concisely

Achieving "Good" or Higher Ad Strength

Google Ads displays RSA "ad strength" on a five-level scale: "Incomplete," "Poor," "Average," "Good," and "Excellent." Aiming for "Good" or higher is recommended.

Key points for improving ad strength:

• Maximize the number of headlines and descriptions (as close to 15 and 4 as possible)
• Make each headline unique (avoid repeating similar expressions)
• Naturally incorporate primary keywords into headlines

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Pre-Improvement Situation (CTR 4.8%)

When ISVD first launched its Ad Grants operations, CTR hovered at 4.8%, dangerously close to falling below the 5% maintenance requirement. Analysis identified three root causes:

1. Overuse of broad keywords: Two-word-or-fewer keywords accounted for 40% of the total
2. No negative keywords set: The exclusion list was empty, causing impressions for irrelevant searches like "social issues essay" and "NPO employment"
3. Insufficient ad group granularity: Over 50 keywords were crammed into just 3 ad groups, reducing ad copy relevance

Improvement Actions (3 Phases)

The improvement was executed in three phases:

Phase 1: Keyword Audit (Week 1)

• Listed all keywords with their CTR and Quality Score
• Paused keywords with CTR below 3% and Quality Score of 3 or lower (35% of total keywords paused)
• Paused all broad keywords of 1-2 words

Phase 2: Long-Tail Keyword Migration (Weeks 2-3)

• Extracted 120 long-tail keywords from Google Search Console and Keyword Planner
• Created 8 new theme-based ad groups with 15-18 keywords each
• Built theme-specific RSAs for each group (10+ headlines, 4 descriptions)

Phase 3: Negative Keywords and Ongoing Optimization (Week 4 onward)

• Created a shared negative keyword list with an initial 60 terms
• Reviewed the search terms report weekly, adding 5-10 new terms each week
• Conducted monthly RSA performance reviews, replacing low-click-rate assets

Results (CTR 9.1%)

After implementing all three phases, CTR reached 9.1% within six weeks of starting the improvement process.

When decomposing the CTR improvement by factor, negative keyword implementation (eliminating unnecessary impressions) had the largest impact, followed by long-tail keyword migration (improving search intent alignment), and RSA optimization (improving ad copy relevance).

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Maintaining Ad Grants CTR above 5% is 80% determined by keyword design quality. Below is a checklist summarizing the techniques covered in this article.

Keyword Design Checklist:

• Have all 1-2 word broad keywords been paused?
• Are long-tail keywords (3+ words) placed in each ad group at 15-20 per group?
• Has a shared negative keyword list been created with an initial 30-50 terms?
• Have ad groups been restructured following the "one theme = one group" principle?
• Does each ad group have an RSA with 8+ headlines and 3+ descriptions?
• Has a weekly search terms report review been incorporated into the operational cycle?
• Is RSA ad strength rated "Good" or higher?

Keyword design is not a one-time task. It requires continuous adjustment as search queries evolve and Google's algorithms update. We recommend establishing a habit of weekly search terms reviews and monthly keyword structure reassessments at minimum.

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Related Articles

• How Ad Grants' $10,000 Monthly Ad Budget Works (B-2)
• Common Patterns in Ad Grants Rejections — The Structure of Application Failures (B-5)

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References

Ad Grants Policy Compliance Guide — Google LLC (2025). Google for Nonprofits Help

Account management policy — Google for Nonprofits Help — Google LLC (2025). Google for Nonprofits Help

Tips for success with Google Ad Grants — Google LLC (2025). Google for Nonprofits Help

About responsive search ads — Google LLC (2025). Google Ads Help

About negative keywords — Google LLC (2025). Google Ads Help