B2B Google Ads Audit: Desktop vs Mobile — Stop Overpaying for Mobile Leads
Watch the full video: B2B Google Ads Audit: Desktop vs Mobile
A common question I get from B2B advertisers is: “David, if we can make one tweak to our Google Ads campaigns to have the biggest impact, what would that be?” It’s a complicated question, but my answer often surprises people. It’s not ad copy. It’s not keywords. It’s not even landing pages.
It’s your device strategy.
The hard truth is that Google typically puts most of your impressions on mobile devices. There are simply more mobile impressions available, so that’s where the volume goes — even on B2B campaigns. What we typically do is go in, run a deep audit of where the splits are, and figure out what makes the most sense for that specific business.
The Metrics That Mislead You
Let me walk through a real example. We had a client in the warehousing and office space industry — they offer combined warehouse and office space to smaller entrepreneurs who need a place to ship product from.
When we first looked at their account, the surface-level metrics told a familiar story:
- More clicks on mobile devices
- More conversions on mobile
- Significantly lower CPCs on mobile
- Lower cost per conversion on mobile
At first glance, you’d think mobile is crushing it. The client was happy and wanted to keep pushing more budget into mobile.
But we dug further.
Where the Real Story Hides
Conversion Rate by Device
When we pulled conversion rate by device, computers converted at almost a 50% higher rate than mobile devices. So while the cost per lead looked cheaper on mobile, desktop users were demonstrating significantly higher intent.
Lead Quality Through the Funnel
This is where it gets really important. We asked the client to pull all of their leads for a full quarter and break them out by the device they originated from. Then we looked at how those leads moved through the funnel — from MQL to SQL, to opportunity, to proposal, to close.
Desktop leads had 5x better ratios through the lead funnel compared to mobile leads.
That’s not a marginal difference. That’s a fundamental insight that changes how you should allocate your budget.
How to Implement Device Strategy Changes
Depending on your bid strategy, there are a few ways to act on this:
If You’re Using Manual Bidding
Use bid adjustments. Drop your bids on mobile, consider putting a -100% adjustment on tablets, and bump up your computer device bids.
If You’re Using Smart Bidding
Use value rules — that’s the best approach we’ve found for smart bidding campaigns. Value rules let you signal to the algorithm that conversions from desktop are worth more.
Campaign Segmentation
In some cases, splitting out a desktop-only campaign vs. a mobile campaign can be effective. It’s not our preferred approach for a variety of reasons, but it is a valid option depending on the situation.
Key Takeaways
- Don’t trust surface-level metrics — lower CPCs and CPAs on mobile don’t mean better ROI
- Check conversion rates by device — higher intent users often skew toward desktop in B2B
- Audit lead quality through the full funnel — break out MQL-to-close ratios by device to see the real picture
- Push Google to favor desktop — whether through bid adjustments, value rules, or campaign segmentation, make sure your budget flows where the quality is
For B2B advertisers, the device split is one of the most underrated levers in your account. A quick audit could reveal that you’ve been overpaying for lower-quality mobile leads while underinvesting in the desktop traffic that actually closes.