Google Ads device bid adjustments for B2B SaaS: why desktop wins

B2B software purchases are made at desks, on desktops, during evaluation sessions that involve multiple browser tabs, comparison spreadsheets, and often a second person in the room. They are not made on mobile phones. Google Ads default bids equally across desktop, tablet, and mobile. For B2B SaaS, this means paying the same for a mobile click from someone briefly checking something on their phone as for a desktop click from someone actively evaluating software for their company.

What does device performance actually look like in B2B SaaS?

In B2B software Google Ads accounts, desktop conversion rates are typically 2–4x higher than mobile. Mobile accounts for 30–50% of clicks in most campaigns — but generates 10–20% of conversions. The result: mobile cost-per-conversion is often 3–5x desktop cost-per-conversion. Without device bid adjustments, roughly half your budget is going to the device type that converts at a quarter of the rate. Check this in your own account: Reports → Predefined Reports → Other → Device. Add conversion rate and cost per conversion columns.

How do you set device bid adjustments?

In Google Ads, go to Campaigns → select your campaign → Settings → Devices. You'll see Desktop, Mobile, and Tablet with bid adjustment sliders. For B2B SaaS, start with: Mobile: -40% to -50% (reduces bids on mobile auctions by that percentage). Tablet: -20% to -30% (tablets convert better than mobile but worse than desktop). Desktop: 0% (neutral — this is your best-performing device). After 30 days, check if the adjustments improved your overall cost-per-conversion and adjust accordingly.

Should you ever completely exclude mobile?

Only if your conversion data shows near-zero mobile conversions over 60+ days with meaningful click volume. Complete mobile exclusion (-100% bid adjustment) means zero impressions on mobile — you'd miss the occasional mobile conversion and any mobile awareness contribution. Start with -50% rather than -100% — it reduces mobile spend significantly while maintaining some presence. Reserve full exclusion for products that have genuinely zero mobile conversion signal after several months of data.

Does this apply to Meta Ads too?

Yes, with the same logic. Meta Ads run across Facebook and Instagram on desktop and mobile. B2B software conversions happen at a much higher rate on desktop. In Meta's campaign settings, you can exclude mobile placements or apply separate budgets to desktop-only ad sets. For cold audience campaigns, test desktop-only vs all-devices versions with split budget — the desktop-only campaigns typically show meaningfully better CPA for B2B software.