Short answer: yes, it can be. Google Ads won’t stop you from adding hundreds of keywords to an ad group, but a long, unfocused list usually makes your ads less relevant, your budget thinner, and your account harder to manage. For most small and mid-sized accounts, a tight list of closely related keywords beats a huge one.
The real problem isn’t the number itself. It’s what a big list does to your account.
Why too many keywords hurts performance
1. Your ads stop matching what people search
A Google Ads ad group works best when every keyword in it shares one intent, so one set of ads can speak directly to it. When you mix “emergency plumber”, “plumbing course” and “buy pipes” in one group, no single ad can fit all three. Ad relevance and landing page experience drop, and both feed into your Quality Score. See our guide on how to improve Quality Score in Google Ads.
2. Your budget gets spread too thin
With a small daily budget, 200 keywords all compete for the same few dollars. Budget gets spent on low-intent clicks before your best keywords get their turn.
3. You can’t tell what’s working
When clicks are spread across hundreds of keywords, each one gets too little data to judge. You end up unable to tell which terms actually bring leads, so optimization becomes guesswork.
4. You pay for irrelevant searches
The more keywords you add, especially broad ones, the more search terms you match that you never intended to. Without regular cleanup with negative keywords, you pay for clicks that were never going to convert. Here’s how to add negative keywords in Google Ads step by step.
5. Your own keywords compete with each other
Near-duplicate keywords across ad groups can trigger the same searches, which muddies your data and makes your account messy to maintain.
How many keywords should you use?
There is no official ideal number, and Google doesn’t set a recommended count. As a practical starting point:
|
Account type |
Keywords per ad group |
|---|---|
|
Small local business, limited budget |
5 to 10 |
|
Typical lead-gen account |
10 to 20 |
|
Larger accounts with strong budgets and smart bidding |
Can go higher, if intent stays tightly grouped |
These are rules of thumb, not Google requirements. What matters is that every keyword in the group could be answered by the same ad and the same landing page. If it can’t, split the group.
When more keywords are actually fine
It isn’t always bad. A larger keyword list can work when:
- You have a big enough budget to give each keyword data
- Keywords are grouped tightly by theme or intent
- You maintain the account weekly, reviewing search terms and adding negatives
- You’re using broad match with good conversion tracking and smart bidding, where Google relies more on signals than exact keyword lists
The mistake is adding keywords because a tool suggested them, not because they match a real customer search.
Warning signs you have too many keywords
- Your campaigns hit their daily budget early in the day
- Many keywords show “low search volume” or have almost no impressions
- Your search terms report is full of irrelevant queries
- Quality Scores are low (4 or under) across many keywords
- Ad groups mix several different services or intents
- Cost per lead keeps rising and you can’t pinpoint why
If several of these sound familiar, an audit will usually find quick savings. Use our checklist for how to audit a Google Ads account.
How to clean up an over-stuffed account
- Pull a keyword report for the last 90 days. Sort by cost and conversions.
- Pause keywords with spend and zero conversions. Keep ones with a clear reason to stay, such as strong intent but low traffic.
- Remove or pause near-duplicates that overlap with a better performing keyword.
- Split mixed ad groups. Aim for one clear theme per group, with ads that mention that theme.
- Review the search terms report weekly. Add irrelevant queries as negative keywords.
- Check Quality Score on your top keywords and fix the lowest ones first, starting with ad relevance and landing page match.
- Rewrite your ads to match each tighter group.
- Recheck after 2 to 4 weeks. Look at cost per conversion, not just clicks.
A simple example
Imagine a dentist running one ad group with 60 keywords covering teeth whitening, braces, emergency dentist, and dental jobs. Ads can’t speak to all of them, so Quality Score is low and the cost per click is high.
After splitting into three groups of 8 to 12 keywords each (whitening, braces, emergency), adding negatives like “jobs” and “course”, and writing ads for each group, the ads match searches more closely. The usual result is better relevance, a lower cost per click, and clearer data on what brings in patients. Results vary by account, so treat this as an illustration, not a promise.
FAQ
Q. Is there a limit on keywords in Google Ads?
A: Yes, but the technical limits are very high, so you will rarely hit them. The practical limit is how many keywords you can manage well on your budget.
Q. Do more keywords get me more clicks?
A: Not necessarily. More keywords can mean more impressions, but if they’re loosely related they often bring low-quality clicks and waste budget.
Q. Does having too many keywords lower Quality Score?
A: Not directly. Quality Score is based on expected click-through rate, ad relevance, and landing page experience. But large mixed groups tend to make ads less relevant, which pulls that score down.
Q. Should I remove keywords with low search volume?
A: Not automatically. If a low-volume keyword is highly relevant and has strong intent, it can be worth keeping. Remove the ones that are both low volume and off-target.
Q. Are negative keywords the same as removing keywords?
A: No. Negative keywords block unwanted searches. Removing keywords stops you from bidding on terms you chose. You usually need both.