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Is Adding Too Many Keywords Bad for Google Ads?
Short answer: Yes, and it costs you real money every single day. We’ll show you exactly why it happens, what it does to your campaigns, and how to fix it the right way.
- The Quick, Honest Answer
- What Actually Happens When You Add Too Many Keywords
- How It Hurts Your Quality Score (And Your Wallet)
- How Many Keywords Should You Actually Use?
- Understanding Keyword Match Types
- The Right Way to Build a Google Ads Keyword List
- Don’t Forget Negative Keywords
- FAQ — Quick Answers
When we audit new Google Ads accounts and we’ve audited a lot of them, one mistake shows up over and over: way too many keywords stuffed into a single ad group.
We get it. More keywords sounds like more chances to be found, right? More traffic, more clicks, more sales. The logic makes sense on the surface. But in practice, it works the opposite way. Adding too many keywords to your Google Ads campaigns is one of the fastest ways to burn your budget with very little to show for it.
In this guide, we’ll break it all down in plain English — no confusing jargon, no fluff. Just clear, practical guidance from our team that manages Google Ads campaigns for real businesses every day.
✅ The Quick, Honest Answer
Yes — adding too many keywords to your Google Ads is bad. Not just a little bad. It can quietly drain your whole ad budget without showing you any real results.
The core rule: Google Ads rewards relevance. When your keywords, your ads, and your landing page all match each other closely, Google gives you a higher Quality Score — which means lower costs and better ad positions. Too many unrelated keywords break this chain completely.
Think about it this way. Imagine you run a shoe store and your ad group has keywords like:
- “running shoes for men”
- “buy leather boots online”
- “kids school shoes”
- “waterproof hiking footwear”
- “cheap sandals free delivery”
These are all about shoes — but they’re for completely different types of people with completely different needs. One ad can’t speak to all of them at the same time. So Google’s system sees your ads as not very relevant, marks you down, and you end up paying more for worse results.
- Higher Quality Score
- Lower cost-per-click
- More relevant ad copy
- Better landing page match
- Higher click-through rate
- Less wasted budget
- Low Quality Score
- Higher cost-per-click
- Generic, weak ad copy
- Mismatched landing pages
- Low click-through rate
- Budget wasted on wrong clicks
💸 What Actually Happens When You Add Too Many Keywords
Let’s walk through the real-world effects step by step. This is what we actually see happening inside over-stuffed Google Ads accounts:
Your Ads Become Too Generic
When one ad group covers 50 different keywords, you can’t write ad copy that’s specific to all of them. You end up writing something vague like “Buy All Kinds of Shoes Online” — and vague ads don’t get clicks.
Google Shows Your Ads for Wrong Searches
Broad keywords in a cluttered ad group often trigger your ads for searches that have nothing to do with what you sell. You’re paying for clicks from people who were never going to buy from you.
Your Quality Score Drops
Google grades every keyword in your account on a 1–10 Quality Score. When your ad doesn’t match the keyword well, and the landing page doesn’t match either, your score falls — and your costs go up.
Your Budget Gets Eaten Up Fast
More keywords usually means more daily spend — but on the wrong searches. We’ve seen accounts spending $1,000/month where 70% of clicks had zero chance of converting because the keywords were too broad and too many.
Reporting Becomes a Mess
When one ad group has hundreds of keywords, it becomes very hard to tell which ones are actually working. You lose the ability to optimise properly — and bad performers hide inside the noise.
Real example from our audits: We reviewed an account that had over 400 keywords in a single ad group targeting a small local service area. The campaign had a Quality Score of 2/10, a click-through rate of 0.4%, and was spending $800/month with zero conversions. After restructuring into 6 tightly themed ad groups with 8–12 keywords each, conversions started within the first two weeks.
Is Your Google Ads Account Wasting Money on Bad Keywords?
We’ll audit your campaign for free and show you exactly where your budget is leaking. No obligation — just honest answers from our PPC team.
📊 How It Hurts Your Quality Score (And Your Wallet)
Quality Score is Google’s way of rating how good and relevant your ad experience is. It’s measured on a scale of 1 to 10. The higher your score, the less you pay per click — and the better your ad position.
Quality Score is made up of three things:
When you stuff too many keywords into one ad group, all three of these take a hit:
- Ad relevance falls — one ad can’t be highly relevant to 100 different keywords
- Landing page experience falls — one landing page can’t perfectly answer every keyword’s intent
- Expected CTR falls — a generic ad gets fewer clicks
Cost impact: A Quality Score of 10 can reduce your cost-per-click by up to 50% compared to a score of 5. A score of 1–3 can make you pay 2–4x more for the same position as a competitor with a better score. This means keyword quantity directly impacts how much you pay.
| Quality Score | Ad Position | Cost Per Click | Your Ad Spend Efficiency |
|---|---|---|---|
| 9–10 | Top positions | Very Low ↓ | Excellent |
| 7–8 | Top or near top | Low | Good |
| 5–6 | Mid positions | Average | Average |
| 3–4 | Lower positions | High ↑ | Poor |
| 1–2 | Rarely shown | Very High ↑↑ | Wasted spend |
🎯 How Many Keywords Should You Actually Use?
This is the question everyone wants answered, so let’s be direct about it.
The sweet spot: 5 to 20 keywords per ad group. This is what Google themselves recommend, and it’s what our team uses for every campaign we build. Each ad group should have one clear theme — and all keywords in it should match that theme tightly.
Here’s a simple way to think about it: if all the keywords in your ad group can be answered by the same ad and the same landing page, you’re on the right track. If you’d need to write different ads for different keyword groups, you need to split them up.
A Simple Example — The Right Way to Organise
Same intent → same ad → same landing page ✓
Different intents → one generic ad → wrong landing page ✗
What About Too Few Keywords?
Going too small (1–2 keywords per ad group, sometimes called SKAGs) was popular a few years ago but is now considered outdated. With Google’s Smart Bidding and modern match type behaviour, 5–15 well-chosen keywords per ad group gives you the best balance of control and performance.
🔑 Understanding Keyword Match Types
Keyword count isn’t the only thing that matters — how you set up each keyword matters just as much. Google Ads has three keyword match types, and using the wrong one can cause all the same problems as having too many keywords.
Widest Reach
Your ad can show for any search Google thinks is related. Powerful but risky without negative keywords. Uses Smart Bidding to find the right moments.
running shoesBalanced
Your ad shows for searches that include the meaning of your keyword. Good middle ground between reach and control.
“running shoes for men”Tightest Control
Your ad only shows for searches that match your keyword very closely. Low volume, high relevance, best conversion rates.
[men’s running shoes]The most common mistake we see: Adding 100+ broad match keywords with no negative keywords. This is the absolute worst combination. Broad match on its own already expands your reach dramatically — stacking 100 of them means your ads can show for almost anything. Your budget disappears fast.
Our Google Ads team typically starts most campaigns with a mix of phrase match and exact match keywords, then adds broad match selectively once we have good conversion data to guide Smart Bidding.
Let Us Build a Google Ads Campaign That Actually Converts
We set up tightly structured campaigns with the right keywords, right match types, and right bidding strategy — so your budget works harder from day one.
🛠️ The Right Way to Build a Google Ads Keyword List
So if stuffing keywords is wrong, what does the right approach look like? Here’s the process we follow for every campaign we build at Shark Labs:
Start With Your Core Offer
Write down exactly what you sell and who you sell it to. Be specific. “Shoes” is not specific. “Men’s trail running shoes” is specific. Your keywords should describe your exact offer.
Group Keywords by Theme (SKAG-light approach)
Put keywords that share the same intent and audience into the same ad group. Each group gets its own ad copy and landing page. If a keyword doesn’t fit the group’s theme, it goes in a new group — or gets cut.
Use Google Keyword Planner
Use the free Keyword Planner tool inside Google Ads to find search volume, competition levels, and keyword ideas. Focus on keywords that match what someone types when they’re ready to buy — called “commercial intent” or “transactional intent” keywords.
Keep Each Ad Group to 5–15 Keywords
This is your golden rule. If your list grows beyond 15–20 keywords in one group, ask yourself: can I split this into two more focused groups? Most of the time, the answer is yes.
Write Ad Copy That Reflects the Keywords
Once your keyword groups are clean, writing great ad copy becomes easy — because you know exactly who you’re talking to and what they’re searching for. Include the main keyword in your headline.
Review and Prune Every Month
Check your Search Terms report monthly. Any keyword that’s been getting clicks but zero conversions for a reasonable time should either be paused or added as a negative keyword. This keeps your account clean and efficient.
“A clean campaign with 40 focused keywords will almost always outperform a bloated one with 400 random ones. Simplicity wins in Google Ads.”
— Shark Labs Global, Google Ads Team🚫 Don’t Forget Negative Keywords
Here’s the piece that most beginners completely ignore — and it’s just as important as the keywords you add: negative keywords are the words and phrases you tell Google not to show your ads for.
For example, if you sell premium running shoes, you probably don’t want your ads showing when someone searches “free running shoes” or “how to repair running shoes” — those people aren’t going to buy from you. Adding “free” and “repair” as negative keywords stops your budget going to those useless clicks.
Negative Keywords Every Google Ads Account Should Have
- free — People looking for free things are not looking to buy
- DIY / how to — Informational searches, not buying intent
- jobs / careers / salary — They want to work in your industry, not buy from you
- Your competitors’ brand names — Unless you’re running a competitor campaign intentionally
- Irrelevant product categories — If you sell shoes, add “clothing”, “bags” etc. as negatives
- Informational words — “what is”, “definition of”, “history of”
Pro tip: Check your Search Terms report every week when a campaign is new. This shows you the exact searches that triggered your ads. Every irrelevant search you spot is a negative keyword you should add right away. Over time, this list becomes one of your most valuable campaign assets.
Our Google Ads management service includes weekly Search Terms analysis and negative keyword management as standard — it’s one of the highest-impact optimisations we do for clients every single week.
Explore Our Related Services
Running Google Ads well connects to your whole digital marketing strategy. Here’s how our services work together:
❓ FAQ — Quick Answers
Here are the most common questions we get about Google Ads keywords — answered plainly:
Stop Wasting Budget on the Wrong Keywords
Our Google Ads team will rebuild your campaigns the right way — focused keyword groups, tight ad copy, proper negatives, and monthly optimisation. Let’s talk.
Wrapping It Up
The idea that more keywords equals more traffic equals more sales is one of the biggest myths in Google Ads. In reality, keyword quantity without relevance is just noise — expensive noise.
The accounts that perform best are almost always the simplest ones: clear themes, 5–15 focused keywords per group, strong ad copy that matches those keywords, and landing pages that deliver exactly what was promised in the ad.
If you’re not sure whether your current Google Ads setup is working the way it should, our Google Ads management team offers free audits. We’ll tell you honestly what we find — and what we’d do to fix it. You can also explore our full digital marketing services if you want a more complete picture of your online growth strategy.