How To Find the Best Keywords for AdWords Campaigns

Let's be honest. You can have the best ad copy in your industry, a landing page that converts like crazy, and a generous budget, but if you're bidding on the wrong keywords, none of that matters.

AdWords keyword research isn't just a box to check before you launch. It's the foundation everything else gets built on. Get it right, and your ads show up in front of people who actually want what you're selling. Get it wrong, and you're burning through budget on clicks that never convert.

In 2026, the competition for paid search real estate is tighter than ever. Smart advertisers aren't just picking keywords based on search volume anymore. They're looking at intent, competition levels, bid costs, and how each keyword fits into their overall funnel. That's what separates campaigns that scale from ones that quietly drain your budget every month.

The Cost of Getting It Wrong

Think about it: a single poorly chosen keyword can eat through your daily budget in under an hour. No clicks from the right audience. No conversions. Just wasted spend.

Here's a quick look at what happens when keyword research goes wrong:

• High click volume, low conversions (wrong intent)
• Ads showing for irrelevant searches (too broad)
• Missing out on buyers because you skipped long-tail terms
• Overpaying for keywords your Quality Score tanks
• Competitor terms eating your budget with no return

Real talk: most small business owners running their own AdWords campaigns overpay by 30-50% because they skip proper keyword research. That's not a small number when you're spending €1,000 a month on ads.

What Good Keywords Actually Look Like

Good keywords aren't just high-volume terms. They're the ones that match what your ideal customer is searching for at the exact moment they're ready to act.

Strong keywords for AdWords campaigns tend to share a few traits:

• Clear commercial or transactional intent
• Reasonable competition level relative to your budget
• High relevance to your landing page and offer
• Specific enough to attract the right audience
• Consistent with the language your customers actually use

That last one trips people up more than you'd expect. You might call your product something different from what your customers search for. AdWords keyword research bridges that gap.

If you're running paid search campaigns and still doing keyword research manually, you're leaving a lot of time and money on the table. Semly Pro changes that.

Semly Pro is built for PPC specialists, digital marketers, and small business owners who want data-driven keyword insights without spending hours in spreadsheets. It tracks up to 500 keywords on the Business Pro plan, gives you AI visibility scores, and helps you spot what your competitors are targeting before you even launch a campaign.

What Semly Pro Does for PPC Keyword Research

Here's what you get with Semly Pro that most tools don't offer out of the box:

• AI visibility score - see how your keywords perform across AI-powered search, not just traditional Google results
• Competitor keyword detection - find out which terms your competitors are winning on
• AI tracking prompts - Pro gives you 25/month, Business Pro gives you 50/month
• Keyword tracking - 100 keywords on Pro, 500 on Business Pro
• Content briefs done for you - on the Managed SEO plan, keyword research is handled by a dedicated strategist

Pricing is clear and upfront. The Pro plan starts at €139/month and covers solo marketers or small businesses. Business Pro is €229/month for agencies and growing teams, and if you want your entire keyword and content strategy managed end-to-end, the Managed SEO plan is €469/month.

There's also a 7-day free trial on Pro. No commitment required. That's a pretty low bar to see whether it works for your campaigns.

How Semly Pro Compares to Other Tools

More on the full comparison in the dedicated section below, but the short version is this: Semly Pro is the only tool on this list that combines AI search visibility tracking with PPC keyword research and content publishing in one place. You're not paying for three separate subscriptions to do what Semly Pro handles in one dashboard.

Ready to actually build your keyword list? Here's a process that works whether you're managing a €500/month campaign or a €50,000 one.

Step 1: Start With Your Core Topics

Before you open any tool, write down 5-10 topics that describe what your business does. These aren't keywords yet. They're buckets.

Quick example: if you run a plumbing business in Dublin, your core topics might be "emergency plumber," "drain cleaning," "boiler repair," "bathroom installation," and "pipe leak fix." That's your starting point.

From each topic, you'll build out dozens of actual keyword variations, but you need these anchors first. Skip this step and you'll end up with a scattered list that doesn't map to any real buying journey.

Step 2: Use Keyword Research Tools

Now open your tools. There's no shortage of options, but here's what to look for in each:

• Google Keyword Planner - free, gives you volume ranges and bid estimates directly from Google's data
• Semly Pro - tracks keyword performance, AI visibility, and competitor targeting across your full campaign
• Semrush or Ahrefs - strong for competitive analysis and finding keyword gaps
• Google Search Console - shows you what people are already clicking through on, useful for refining your list

Don't rely on just one tool. Each pulls data differently, and combining them gives you a clearer picture of actual opportunity vs. theoretical search volume.

Pro tip: start with Google Keyword Planner to get baseline volume and CPC data, then cross-reference with Semly Pro to check AI search visibility and competitor behavior.

Step 3: Analyze Search Intent

This is the step most people rush through. Don't.

Search intent tells you what a person actually wants when they type a query. There are four main types:

1. Informational - they want to learn ("how does a boiler work")
2. Navigational - they're looking for a specific brand or site ("Semly Pro login")
3. Commercial - they're comparing options ("best plumber in Dublin")
4. Transactional - they're ready to buy or book ("emergency plumber Dublin call now")

For AdWords, you want transactional and commercial intent keywords in your primary ad groups. Informational terms are better suited to content marketing. Bidding on informational queries wastes budget because those users aren't ready to buy yet.

Sound familiar? This is one of the most common reasons AdWords campaigns underperform. Lots of clicks, very few conversions, confused business owner wondering why ads "don't work."

Step 4: Check Competition and Bid Estimates

High search volume doesn't mean high value. You need to look at what it'll actually cost to win clicks on a keyword, and whether that cost makes financial sense for your business.

Here's what to check for each keyword:

• Estimated CPC (cost per click)
• Competition level (low, medium, high in Keyword Planner)
• Top of page bid range (low and high)
• Your expected conversion rate for that term
• Your target cost per acquisition

The math is simple. If a keyword costs €5 per click and you convert 5% of clicks, that's €100 per customer. Is that customer worth €100 to you? If yes, bid. If not, skip it or find a cheaper variation.

Step 5: Build Your Keyword Groups

Grouping keywords properly is what separates organized campaigns from messy ones. Each ad group should contain keywords that are tightly related to each other and to a single landing page.

Tight keyword groups mean your ads are more relevant. More relevant ads get better Quality Scores. Better Quality Scores mean lower CPCs and better ad placement. It's a chain reaction that starts with good structure.

Aim for 5-20 keywords per ad group. Anything more than that and you're probably mixing intent types or being too broad.

Not all keywords work the same way in AdWords. You need a mix of types to cover different stages of the buying journey and control where your budget goes.

Broad Match vs Phrase Match vs Exact Match

Google's match types determine which searches can trigger your ads. Here's a quick breakdown:

In 2026, most PPC specialists recommend starting with phrase match and exact match for new campaigns. You get control without being too restrictive. Broad match can work, but only with strong negative keyword lists in place.

Short-Tail vs Long-Tail Keywords

Short-tail keywords are broad, high-volume terms. "Plumber" is a short-tail keyword. Millions of searches per month, very competitive, very expensive, and very hard to convert because the intent is vague.

Long-tail keywords are specific, lower-volume phrases. "Emergency plumber north Dublin available now" is long-tail. Fewer searches, lower CPCs, and much higher conversion rates because the searcher knows exactly what they want.

Here's the truth about the best keywords for AdWords campaigns: long-tail terms drive the highest ROI for most businesses. They're less glamorous than big-volume terms, but they convert better and cost less.

A good keyword list for most campaigns looks something like this:

• 20-30% short/mid-tail terms for brand awareness and volume
• 60-70% long-tail terms for conversions and efficiency
• 10% branded terms to protect your own name

Negative Keywords

Negative keywords are the ones you tell Google NOT to show your ads for. They're just as important as your positive keyword list, maybe more so.

Without negatives, broad and phrase match keywords can trigger your ads for completely irrelevant searches. That burns budget fast.

Common negative keyword categories to add from day one:

• Informational queries ("how to," "DIY," "free," "what is")
• Job-seeking terms ("jobs," "careers," "salary," "hiring")
• Unrelated product categories (if you sell premium items, add "cheap" and "free")
• Competitor brand names (unless you're running a competitor campaign deliberately)

Review your search terms report every week, especially for the first month. You'll find queries triggering your ads that you never intended, and adding them as negatives will immediately improve your campaign efficiency.

Budget constraints are real. Most small business owners and even some agencies are working with a fixed monthly spend, which means every keyword choice carries weight.

Balancing Volume and Cost-Per-Click

Here's a framework that helps: rank your keyword candidates by a simple efficiency score.

1. Take the estimated monthly search volume
2. Multiply by your expected click-through rate (usually 3-10% for top-of-page ads)
3. Multiply by your expected conversion rate (varies by industry, but 2-5% is a common starting point)
4. Divide by the estimated CPC

The keywords with the highest score are your best bets. They'll give you the most conversions per euro spent.

This isn't a perfect science. Conversion rates vary, but it's a much better way to prioritize than just chasing volume.

Quality Score and Keyword Relevance

Quality Score is Google's rating of how relevant your keyword is to your ad and landing page. It's scored from 1-10. A higher Quality Score means you pay less per click and get better ad positions.

Improving your Quality Score is one of the best ways to stretch your AdWords budget further without spending more. Here's how keyword research connects to it:

• Choose keywords that closely match the language on your landing page
• Group similar keywords together so you can write highly relevant ad copy for each group
• Avoid adding keywords that don't have a dedicated landing page to match
• Regularly remove low-Quality-Score keywords that are dragging down your campaign

A Quality Score of 7 or above on your core keywords is a good target. Below 5 and you're paying a premium for poor placements.

Even experienced marketers make these. Here are the ones worth calling out specifically.

Mistake 1: Only targeting high-volume terms. Big volume numbers are tempting, but if those terms are too broad or too expensive for your budget, you'll burn through spend without results. Mix in long-tail keywords and watch your cost-per-acquisition drop.

Mistake 2: Ignoring negative keywords. Setting up a campaign without a negative keyword list is like leaving the tap running. You'll pay for clicks that were never going to convert. Build your negative list before you go live.

Mistake 3: Setting it and forgetting it. Keyword research isn't a one-time task. Search behavior shifts. New competitors enter the auction. CPCs change. You need to revisit your keyword list at least once a month in 2026 to keep your campaigns efficient.

Mistake 4: Skipping competitor analysis. Your competitors' keywords tell you a lot about what's working in your market. Tools like Semly Pro flag what your competitors are targeting so you can identify gaps or decide where to compete directly.

Mistake 5: Using only one match type. Relying entirely on exact match limits your reach. Relying entirely on broad match destroys your budget. Use a mix, and use negative keywords to keep broad and phrase match campaigns under control.

Mistake 6: Not aligning keywords with landing pages. This one kills Quality Scores. If someone clicks on an ad for "emergency boiler repair Dublin" and lands on your generic homepage, Google notices the disconnect. So does the user. Match every keyword group to a relevant landing page.

Mistake 7: Ignoring seasonal trends. Search volume for many keywords shifts dramatically by season, month, or even day of week. Plan your AdWords keyword research around these patterns, not just annual averages.

There's no shortage of tools claiming to make AdWords keyword research easier. Here's an honest look at how the main players stack up. Semly Pro is listed first because it's the tool we recommend for the most complete workflow, especially if you need keyword tracking, AI visibility, and content publishing in one place.

A few things worth noting about this comparison:

• Semrush and Ahrefs are strong for traditional keyword research but don't cover AI search visibility, which matters more in 2026 than it did even two years ago
• Content-focused tools like Jasper, Frase, and Writesonic are great writers but they don't do keyword tracking or competitor analysis
• Semly Pro is the only option here that covers keyword tracking, AI visibility, competitor detection, and content publishing under one subscription
• If you're on the Managed SEO plan at €469/month, keyword research and content briefs are handled by a dedicated strategist. You don't even have to do this part yourself

Bottom line: if you're running AdWords campaigns alongside an SEO or content strategy, Semly Pro is worth starting with. The 7-day free trial means you can see the data before you commit.

What are the best keywords for AdWords campaigns in 2026?

The best keywords for AdWords campaigns in 2026 are ones that match transactional or commercial search intent, have manageable CPCs relative to your budget, and closely align with what your landing page offers. Long-tail keywords typically deliver the best return on ad spend for most businesses because they're more specific and attract buyers who are further along in their decision process.

How do I do AdWords keyword research for free?

Google Keyword Planner is free and gives you search volume ranges and CPC estimates straight from Google's data. Google Search Console is also free and shows you what queries people are already using to find your site. These two tools together give you a solid starting point for AdWords keyword research without spending anything.

How many keywords should I have in an AdWords campaign?

There's no universal number, but a well-structured campaign typically has 5-20 keywords per ad group and anywhere from 20-100 keywords across the full campaign. Quality matters more than quantity. A tight list of highly relevant keywords almost always outperforms a bloated list of loosely related terms.

What's the difference between broad match and exact match in AdWords?

Broad match shows your ads for searches related to your keyword, including synonyms and variations Google thinks are relevant. Exact match only shows your ads for that specific query or very close variants. Broad match gives you more reach but less control. Exact match gives you precision but limits volume. Most campaigns benefit from using both, with strong negative keyword lists to keep broad match efficient.

Should I bid on competitor keywords in AdWords?

You can, and many advertisers do. Bidding on a competitor's brand name can put your ad in front of people who are actively researching alternatives, but it's usually expensive because the competitor's own Quality Score for their brand terms is much higher than yours. It can work if your offer is clearly differentiated. Test it with a separate campaign and a tight budget before scaling it.

What is a good Quality Score in Google Ads?

Google rates Quality Score from 1 to 10. A score of 7 or above on your core keywords is considered good. Scores of 8-10 give you a discount on CPCs and better ad positions. Scores below 5 mean you're paying a premium. Improving Quality Score comes down to writing more relevant ads, matching keywords tightly to landing pages, and improving your expected click-through rate.

How often should I review my keyword list?

At minimum, once a month. For active campaigns, once a week for the first 30-60 days. The search terms report in Google Ads will show you what queries actually triggered your ads, and you'll almost always find terms you want to add as negatives or new long-tail ideas worth targeting. Keyword research isn't a one-time task. It's an ongoing part of managing a healthy campaign.

Can Semly Pro help with AdWords keyword research?

Yes. Semly Pro tracks keywords, monitors competitor targeting, and gives you AI visibility scores that show how your terms perform across both traditional and AI-powered search. The Pro plan at €139/month tracks up to 100 keywords and includes 25 AI tracking prompts per month. Business Pro at €229/month scales that to 500 keywords and 50 prompts. On the Managed SEO plan at €469/month, a dedicated strategist handles keyword research and content briefs for you entirely.

What are negative keywords and why do they matter?

Negative keywords tell Google which searches should NOT trigger your ads. They're one of the most powerful budget-saving tools available to AdWords advertisers. Without them, broad and phrase match keywords can trigger your ads for searches that have nothing to do with your offer. A plumber who doesn't add "DIY" and "how to" as negatives will pay for clicks from people trying to fix their own pipes rather than hire someone. Review your search terms report regularly to keep your negative list current.

What's the fastest way to get started with AdWords keyword research?

Start with your 5-10 core business topics. Then open Google Keyword Planner and enter each one to generate related keyword ideas with volume and CPC estimates. Filter for keywords with transactional or commercial intent. Add them to a spreadsheet grouped by theme. Then layer in a tool like Semly Pro to check competitor activity and AI search visibility for your top candidates. You can have a solid working keyword list in a few hours if you follow this process. The 7-day free trial on Semly Pro's Pro plan is a good way to start without committing budget upfront.