What is a good CTR for search ads?

It varies by industry and channel, but in general, around 3–7% for Naver search ads (Korea's largest search engine) and 2–5% for Google search ads is about average. Brand keywords can reach 10% or more, while highly competitive generic keywords are sometimes only 1–2%. What matters more than the absolute number is continuously monitoring and improving your own campaigns' trends.

How often should I update my keywords?

It's best to check your search terms report and tidy up your keywords at least once a month. Add new search terms that generated conversions as keywords, and register irrelevant search terms as negative keywords. If your industry is highly seasonal, preparing keyword sets ahead of time for before and after the season is also effective.

How do I optimize when my budget is small?

The more limited your budget, the more important it is to choose and focus. First, concentrate your budget on core keywords with proven conversion performance, and prioritize keywords with low CPC and high conversion rates, such as brand keywords. Limiting ad delivery to the hours with the most conversions, or narrowing your location targeting, are also ways to improve efficiency.

Should I invest in Google Ads or Naver search ads first?

It depends on how your target customers search. In the Korean market, Naver has overwhelmingly more search volume for general consumer goods and services, so starting with Naver is efficient. On the other hand, Google may have a higher share for B2B, IT, and overseas audiences. If possible, the most accurate approach is to test both channels on a small scale and then decide your budget split based on conversion data.

Search Ad Optimization: A Practical Process and Checklist

What Does "Optimization" Mean?

By the dictionary definition, optimization is "planning and designing in the way best suited to a given purpose."

Search ad optimization means building and managing a campaign plan to achieve the goals you want to reach through search ads.

Every campaign has a different KPI (key performance indicator), and budgets are always limited, so a performance marketer's job is to produce the best possible results within the given conditions.

The Search Ad Optimization Process

Search ad optimization isn't a one-and-done task; it's a process of gradual improvement through a repeating cycle. The process I use in practice breaks down into four main steps.

Step 1: Diagnose the problem

Look at your current campaign data and pinpoint where performance is dropping off.

Check the numbers at each stage of the impression → click → landing → conversion funnel
Check week-over-week and month-over-month changes
Compare against industry averages to see if any metric is significantly lower

For example, if impressions are sufficient but CTR is below the industry average (around 2–5%), the ad copy is likely the problem, and if CTR is fine but the conversion rate is low, you can suspect the landing page.

Step 2: Form a hypothesis

Based on the diagnosis, form a specific hypothesis.

"Adding pricing information to the ad copy for our main keywords will increase CTR"
"Splitting brand keywords and generic keywords into separate groups will lower CPC"
"Moving the CTA button on the landing page to the top will improve the conversion rate"

It's important to frame your hypothesis in a measurable form. Instead of "it will get better," you need a concrete numeric goal like "CTR will improve by at least 0.5 percentage points" so you can verify it later.

Step 3: Run the test

Design and run an A/B test to validate the hypothesis.

Change only one variable at a time (if you changed the ad copy, keep the keywords the same)
Keep it running for at least 1–2 weeks until enough data builds up
Record external variables (seasonality, promotions, etc.) during the test period

Step 4: Validate and apply

Analyze the test results, and if a meaningful improvement is confirmed, apply it across the whole campaign.

Check whether the difference is statistically significant
Roll the improved settings out to other groups as well
Record the results and use them in the next optimization cycle

If you repeat this cycle every 2 weeks to 1 month, campaign performance gradually improves.

The Components of Keyword Search Ads

Keyword search ads are made up of keywords, ad copy, and landing pages, and you can drive performance improvements by adjusting these three elements.

1. If keyword impressions are low → Expand keywords / adjust bids

When the number of people seeing your ads is low to begin with:

Expand with a keyword planner or keyword combination tool
Add organic search keywords from your analytics
Use expanded keywords to find valuable keywords you hadn't discovered
If your budget is spending slowly, check your ad rank and readjust bids

2. If CTR is too low → Update your ad copy

Ad copy needs continuous updating:

Using the same ad copy for a long time increases ad fatigue
User responses change with timing and trends
Use A/B tests to understand how people respond to each piece of copy
Use ad extensions (images, sitelinks, etc.) to draw more attention

3. If the bounce rate is high → Review landing pages by group or keyword

When the bounce rate is high:

Check how well the message in the ad copy matches the landing page
Review whether the steps to take action on the landing page are too complicated
Link each keyword to a highly relevant product detail page or category page
Work with the relevant teams if page load time or UI/UX needs improvement

4. If certain keyword types perform unusually poorly (or well) → Separate keywords by performance and adjust budgets

When performance varies widely across keywords:

Reclassify keywords by efficiency
Manage low-efficiency keywords with low bids and low budgets
Put the savings toward high-efficiency keyword groups
Regularly reorganize groupings to use your budget efficiently based on performance

A Practical Search Ad Optimization Checklist

Here are the items that are easy to miss when optimizing search ads in practice. Checking them regularly helps you catch performance drops early.

Weekly checklist:

Check changes in ad rank for key keywords
Check ad groups where CTR has dropped sharply
Check how fast your daily budget is spending (if it runs out too quickly, there are inefficient keywords)
Review new entries in the search terms report and add negative keywords

Monthly checklist:

Analyze conversion performance by keyword and regroup
Check ad copy A/B test results and add new copy
Monitor competitors' ad copy
Analyze CPC trends and adjust your bidding strategy
Check landing page bounce rate and time on page

Common Mistakes in Search Ad Optimization

Here are the mistakes I've often seen over years of running search ads.

Registering too many keywords and leaving them unattended

If you register hundreds or thousands of keywords and don't manage their performance, you'll just waste budget. Keywords that get clicks but no conversions eat into your budget, while the keywords that actually perform well end up short on budget.

The "it worked at first, so let's leave it as is" approach is risky. If you keep the same ad copy for three months or more, ad fatigue builds up and CTR gradually declines. It's best to review your ad copy at least once a month and test new copy at least once a quarter.

Sending every keyword to the same landing page

Someone who searched for "dress" and someone who searched for "summer linen dress" have different intentions. The first may be just browsing, while the second has a more specific intent to buy. Conversion rates go up when you link each keyword to a landing page that matches its search intent.

Raising bids without analyzing competitors

If you raise bids blindly just because CPC went up, your ROAS will deteriorate quickly. Before raising bids, check the competitive landscape and analyze conversion rate by ad rank to first figure out your appropriate bid range. Showing in the top spot doesn't necessarily mean the best efficiency.

FAQ

What is a good CTR for search ads?: It varies by industry and channel, but in general, around 3–7% for Naver search ads (Korea's largest search engine) and 2–5% for Google search ads is about average. Brand keywords can reach 10% or more, while highly competitive generic keywords are sometimes only 1–2%. What matters more than the absolute number is continuously monitoring and improving your own campaigns' trends.
How often should I update my keywords?: It's best to check your search terms report and tidy up your keywords at least once a month. Add new search terms that generated conversions as keywords, and register irrelevant search terms as negative keywords. If your industry is highly seasonal, preparing keyword sets ahead of time for before and after the season is also effective.
How do I optimize when my budget is small?: The more limited your budget, the more important it is to choose and focus. First, concentrate your budget on core keywords with proven conversion performance, and prioritize keywords with low CPC and high conversion rates, such as brand keywords. Limiting ad delivery to the hours with the most conversions, or narrowing your location targeting, are also ways to improve efficiency.
Should I invest in Google Ads or Naver search ads first?: It depends on how your target customers search. In the Korean market, Naver has overwhelmingly more search volume for general consumer goods and services, so starting with Naver is efficient. On the other hand, Google may have a higher share for B2B, IT, and overseas audiences. If possible, the most accurate approach is to test both channels on a small scale and then decide your budget split based on conversion data.

I've also written about other ad types and performance analysis beyond search ads.

Understanding display ads - The basics of display advertising, which works well alongside search ads
Getting shopping search ads to show for the keywords you want - Practical ways to get shopping search ads shown for target keywords
Understanding attribution models - Understanding attribution models to measure search ad conversions accurately