What is keyword bidding?
Keyword bidding is the process of setting the maximum amount you are willing to pay each time a user searches for a keyword that triggers your ad. Your bid, combined with your Quality Score and the bids of competitors, determines whether your ad shows and in what position.
Effective keyword bidding is the difference between a profitable PPC campaign and one that burns budget without return. The goal is not to bid the most — it is to bid the right amount on the right keywords at the right time.
Common keyword bidding issues
1. Overbidding and underbidding
Overbidding inflates your cost per acquisition and wastes budget. Underbidding means your ads rarely show, starving your funnel of traffic. The challenge is finding the bid that maximises profitable conversions without overspending.
2. Ad position fluctuations
Ad position depends on bid, Quality Score, and competitor activity. Sudden drops in position can indicate increased competition, a drop in Quality Score, or budget pacing issues. Inconsistent positioning hurts CTR and makes performance hard to predict.
3. Keyword competition
High-value commercial keywords are contested. Bidding on the same terms as well-funded competitors can be expensive and unsustainable. The alternative is to target long-tail and question-based keywords where competition is lower and intent is specific.
4. Low Quality Score
Google assigns a Quality Score (1 to 10) based on expected CTR, ad relevance, and landing page experience. A low score means you pay more for the same position. Improving Quality Score is often the fastest way to reduce costs without cutting visibility. You should check how many of your pages Google has indexed to ensure your technical SEO is not impacting your Quality Score.
Google's own guidance is useful here: its negative-keyword documentation explains that exclusions are designed to remove irrelevant searches, while the search terms report shows the actual queries that triggered ads. That is why optimisation should be based on observed intent and conversion quality, not simply cheaper clicks or a larger keyword list.
How to solve keyword bidding issues
Strategy 1: Conduct deep keyword research
Go beyond surface-level keyword tools. Use your search terms report to find the actual queries triggering your ads, and identify:
- High-converting keywords to bid more aggressively on
- Irrelevant queries to add as negative keywords
- Long-tail variations with lower competition and clearer intent
Strategy 2: Use negative keywords aggressively
Negative keywords prevent your ads from showing on irrelevant searches. This is one of the highest-impact, lowest-effort optimisations in PPC. For agencies managing multiple client accounts, understanding the topical authority content strategy can help inform which terms are worth bidding on vs. organic acquisition.
Strategy 3: Implement bid adjustments
Google Ads allows bid adjustments based on device, location, time of day, and audience. Use performance data to increase or decrease bids:
- Device: If mobile users convert at a higher rate, increase mobile bids by 10 to 20 percent
- Location: Increase bids in regions with high conversion rates; decrease in underperforming areas
- Time of day: Schedule bid increases during your peak conversion hours
- Audience: Layer remarketing audiences and increase bids for users who have previously visited your site
Strategy 4: Improve Quality Score
To raise your Quality Score:
- Improve ad relevance: Ensure ad copy includes the keyword and matches search intent
- Improve landing page experience: Make pages fast, relevant, and mobile-friendly
- Improve expected CTR: Write compelling ad copy and use ad extensions
A one-point increase in Quality Score can reduce CPC by 10 to 20 percent.
Strategy 5: Use automated bidding strategically
Google offers automated bidding strategies — Target CPA, Target ROAS, Maximise Conversions — that use machine learning to adjust bids in real time. These can be effective when:
- You have sufficient conversion data (at least 30 conversions per month per campaign)
- Your conversion tracking is accurate and complete
- You have clear target CPA or ROAS goals
Avoid automated bidding when data is sparse or conversion tracking is unreliable — the algorithms need data to learn from.
Strategy 6: A/B test ad copy and landing pages
Bidding strategy is only as effective as the ads and pages it sends traffic to. Test:
- Different headline angles (benefit vs feature vs question)
- Different CTAs ("Start trial" vs "Book demo" vs "See pricing")
- Different landing page layouts and form lengths
Use the results to focus bids on the combinations that convert best.
Strategy 7: Monitor and adjust regularly
PPC is not set-and-forget. Review performance weekly:
- Which keywords are driving conversions at a profitable CPA?
- Which keywords are spending without converting?
- Are there new search terms worth adding as keywords?
- Has competitor activity changed your impression share?
Act on the data — pause underperformers, increase bids on winners, and refine negative keyword lists continuously. If you are struggling with ROI, you should score your site's search visibility to determine your true revenue potential.
When to seek expert help
If your campaigns are spending budget without delivering profitable conversions, or if you lack the time to manage bids actively, a specialist can diagnose the issues and build a bidding strategy aligned to your revenue targets. For comprehensive support, consider our Google Ads Management services.
Need help solving keyword bidding issues? Book a free session with a 27-year search specialist.