How to Use Device Bid Adjustments in Google Ads: A Step-by-Step Guide

TL;DR: Device bid adjustments let you pay more or less for clicks depending on whether someone's on a desktop, mobile, or tablet. If you're running Google Ads without them, you're almost certainly overpaying on some devices and underbidding on others. This guide walks you through exactly how to set them up, read the data, and make smarter decisions—without the guesswork.

Here's the thing most PPC guides skip: device bid adjustments aren't just a setting you flip once and forget. They're an ongoing lever that can meaningfully shift your cost-per-conversion and ROAS once you understand how your audience actually behaves across devices.

Whether you're a freelancer managing a handful of accounts or an agency juggling dozens of clients, getting this right is one of the faster wins available to you in Google Ads. We'll cover what data to look at first, how to apply adjustments at the campaign and ad group level, what ranges actually make sense, and how to avoid the most common mistakes advertisers make when setting these up.

Step 1: Pull Your Device Performance Data Before Touching Anything

Before you change a single bid, you need to know what's actually happening across devices in your account. Sounds obvious, but in most accounts I audit, advertisers have either never looked at device-level performance or they're making adjustments based on gut feel rather than data.

Here's how to pull the right data. Navigate to Google Ads, open your Campaigns view, and use the Segment dropdown to break performance down by Device. You'll immediately see your metrics split across Computers, Mobile phones, and Tablets.

Now here's the critical part: don't just look at clicks or impressions. Those numbers are almost meaningless for bid adjustment decisions. The metrics that actually matter are:

Conversion Rate by Device: Which device is actually turning clicks into leads or sales? A device with high click volume but low conversion rate is eating budget without delivering results.

CPA by Device: What are you paying per conversion on each device? If mobile CPA is significantly higher than desktop, that's a direct signal to reduce mobile bids.

ROAS by Device: For e-commerce accounts, this tells you which device is generating the most revenue per dollar spent. A device with low ROAS is a candidate for a negative adjustment.

One thing I see constantly: people pull 7 or 14 days of data and immediately start making adjustments. That's a mistake. You need at least 30 days of data before drawing conclusions, and ideally 60 to 90 days for lower-volume campaigns. Small sample sizes lead to bad adjustments. If a device only drove 8 conversions in two weeks, that's not enough signal to confidently shift bids.

A common finding when you do this analysis: mobile often drives high click volume but lower conversion rates, especially for B2B, SaaS, or any purchase that involves a complex decision. People browse on mobile and convert on desktop. That pattern doesn't hold everywhere, but it's worth checking in your own data before assuming. Understanding device optimization in Google Ads gives you the foundation to interpret these patterns correctly.

Export the numbers or write them down. What you're looking for is a clear gap between devices. Which device has the highest CPA? Which has the best conversion rate? That gap is where your adjustment opportunity lives.

Step 2: Understand the Adjustment Range and What the Numbers Actually Mean

Device bid adjustments in Google Ads run from -100% to +900%. That's a wide range, and most advertisers should be working in a much narrower band. Let's break down what these numbers actually do.

A positive adjustment means you're willing to pay more per click on that device. A +20% adjustment on desktop means if your base max CPC is $2.00, your effective max CPC on desktop becomes $2.40. You're telling Google: "This device is more valuable to me, bid higher."

A negative adjustment works in reverse. A -50% adjustment on mobile means your $2.00 base bid becomes $1.00 on mobile. You're reducing how aggressively you compete for clicks on that device.

Setting a device to -100% removes your ads from that device entirely. This is a common choice for tablets in many campaigns, and we'll come back to that.

Adjustments stack on top of your base bid multiplicatively. So if your base CPC is $2.00 and you set +30% for mobile, your effective max CPC on mobile becomes $2.60. That math matters when you're also running location adjustments or audience bid adjustments, because these all stack together and can create unexpectedly high effective bids if you're not paying attention.

Now for the most important thing in this entire guide, and the point most articles completely miss: if you're running Smart Bidding, device bid adjustments are largely ignored.

Smart Bidding strategies like Target CPA, Target ROAS, Maximize Conversions, and Maximize Conversion Value already incorporate device signals automatically as part of auction-time bidding. Google's algorithm is already adjusting for device performance in the background. When you manually set a device adjustment on top of a Smart Bidding strategy, the algorithm mostly overrides it.

Device bid adjustments are most impactful when you're on Manual CPC or Enhanced CPC. If you're on Smart Bidding and you want more device-level control, the better move is to segment campaigns by device rather than layering adjustments on top of an algorithm that's already handling it.

Performance Max campaigns are a separate case entirely: PMax doesn't support manual device bid adjustments at all. Google controls device distribution automatically in those campaigns, and there's no lever to pull.

Step 3: Apply Device Bid Adjustments at the Campaign Level

Once you have your data and you understand what the numbers mean, applying the adjustment itself is straightforward. Here's the exact path.

Go to Google Ads and select the campaign you want to adjust. In the left sidebar, look for the section labeled "Audiences, keywords, and content" and click on Devices. You'll see a table showing Computers, Mobile phones, and Tablets with their current adjustment status.

Click the pencil icon next to the device you want to adjust. A field will appear where you can enter your adjustment percentage. Enter a positive number to increase bids or a negative number to reduce them. Save the change and it takes effect immediately.

On the question of how aggressive to be: start conservatively. In most accounts, adjustments of plus or minus 20 to 30 percent are a reasonable starting point. Here's a practical example of how to think about it.

Let's say your data shows mobile CPA is 40% higher than desktop. You don't immediately set mobile to -40%. Instead, start with -25% to -30%, monitor for two to three weeks, and see how performance responds. Overcorrecting on the first adjustment is a common mistake, and it can tank reach on a device that might have been contributing assisted conversions you weren't accounting for. Learning how to choose the right bid strategy beforehand helps you avoid this kind of overcorrection.

One workflow habit that pays off over time: document every adjustment you make with the date and the reason. Something as simple as a note in a spreadsheet: "July 1 — mobile adjusted to -25% based on 60-day data showing mobile CPA 40% above desktop." When you come back to review performance in a month, you'll know exactly what changed and when. Without that documentation, you're guessing at causality.

Also worth noting: if you're managing multiple campaigns, each campaign gets its own device adjustment settings. A search campaign and a display campaign in the same account can have completely different device adjustment configurations, and they should if the data supports it.

Step 4: Apply Ad Group-Level Adjustments for Granular Control

Campaign-level adjustments apply broadly to everything in that campaign. But sometimes different ad groups within the same campaign have meaningfully different device performance patterns. That's where ad group-level adjustments come in.

To apply them, navigate to a specific ad group, then click Devices in the left sidebar. The interface is identical to the campaign-level view, but the adjustment you set here applies only to that ad group. Critically, ad group-level adjustments override campaign-level settings for that specific group.

Here's a scenario where this actually matters. Imagine a software company running a single search campaign with two ad groups: one targeting "request a demo" keywords and one targeting "pricing" keywords. The demo ad group might see poor mobile performance because people researching software demos are typically at their desk and ready to engage. But the pricing ad group might actually convert reasonably well on mobile because people quickly checking pricing on their phone are often further along in their decision process.

In that case, a blanket campaign-level mobile adjustment would be too blunt. You'd want a stronger negative adjustment on the demo ad group and a lighter or neutral adjustment on the pricing ad group. Ad group-level control lets you do exactly that.

That said, a word of caution: layering ad group-level adjustments across many ad groups gets complex fast. Every adjustment you add is another variable you need to track and review. Only go this granular when you have clear, data-backed reasons for the differentiation. If you're doing it because it feels more precise without the data to support it, you're just adding complexity without benefit.

For agencies managing multiple clients, the best practice is to maintain a bid adjustment log per account. Track which campaigns and ad groups have device adjustments, what the current values are, when they were last reviewed, and what the performance looked like at the time of the change. This becomes invaluable during account audits and client reporting.

Step 5: Set Up a Review Cadence and Adjust Based on Trends

Setting device bid adjustments is not a one-time task. Device performance shifts over time, and adjustments based on data from six months ago may no longer reflect reality.

A quarterly review is the minimum. Monthly is better, especially in accounts with meaningful conversion volume. Here's what to look for during each review.

First, check whether the gap between devices has narrowed or widened. If you made a -30% mobile adjustment three months ago and mobile CPA has since improved because you rebuilt your mobile landing page, that adjustment may now be too aggressive. You're potentially leaving volume on the table by suppressing a device that's now performing closer to desktop.

Second, look for devices where volume has become negligible. Tablets are a common example. In many accounts, tablet traffic is low volume and poor performing. If a device is generating very few impressions and near-zero conversions across multiple review periods, a -100% exclusion is often the cleaner choice rather than a partial reduction.

Use the Compare date range feature in Google Ads to see period-over-period changes by device. Set it to compare the last 30 days against the previous 30 days, segmented by device. This gives you a clear view of whether device performance is trending in the right direction after an adjustment.

The broader point here is that device bid adjustments should be part of your regular campaign audit schedule, not a separate task you remember to do occasionally. Every time you run a full account audit, device performance should be on the checklist. You can use Google Ads Experiments to test adjustment changes in a controlled way before rolling them out fully. Stale adjustments based on outdated data are almost as problematic as having no adjustments at all.

Step 6: Avoid the Most Common Device Bid Adjustment Mistakes

After auditing a lot of Google Ads accounts, the same mistakes show up repeatedly. Here's the list, with enough context to actually avoid them.

Mistake 1: Acting on insufficient data. Making adjustments based on two weeks of data or a handful of conversions is optimizing noise. Wait for statistical significance. If a device has fewer than 30 conversions in your data window, treat any conclusions as directional at best.

Mistake 2: Using device adjustments with Smart Bidding. As covered in Step 2, Smart Bidding already handles device signals. Layering manual device adjustments on top of Target CPA or Target ROAS campaigns is largely ineffective and creates a false sense of control. Check your bidding strategy before spending time on device adjustments. If you're unsure whether to switch strategies, understanding how automated bidding optimizes campaigns will help you make that call confidently.

Mistake 3: Setting extreme adjustments without monitoring. A -80% mobile adjustment might feel justified if mobile performance looks terrible. But if mobile was driving assisted conversions that eventually converted on desktop, you've just cut off part of your funnel. Start conservative, monitor, then iterate.

Mistake 4: Ignoring adjustment stacking. Device adjustments interact with audience bid adjustments, location adjustments, and ad scheduling adjustments. These stack multiplicatively. If you have a +30% adjustment for a remarketing audience and a +25% adjustment for mobile, a mobile user in that remarketing list gets a much higher effective bid than you might expect. Review your full adjustment stack periodically.

Mistake 5: Treating all campaigns the same. An e-commerce campaign and a B2B lead gen campaign often have opposite device performance patterns. What works for one won't work for the other. Analyze each campaign's device data independently.

Mistake 6: Setting it and forgetting it. Adjustments based on data from a year ago can actively hurt performance if device behavior has shifted. Build device reviews into your regular audit cadence and treat stale adjustments as a risk, not a neutral state.

Frequently Asked Questions About Device Bid Adjustments

Do device bid adjustments work with Smart Bidding? Largely no. Smart Bidding strategies like Target CPA, Target ROAS, and Maximize Conversions incorporate device signals automatically as part of auction-time bidding. Manual device adjustments are mostly ignored when Smart Bidding is active. Device adjustments remain meaningful primarily for Manual CPC and Enhanced CPC campaigns.

Can I exclude tablets completely? Yes. Set tablets to -100% to prevent your ads from showing on tablets entirely. This is a common choice for campaigns where tablet data shows low volume and near-zero conversions. Verify with your own data first, but tablet exclusion is a reasonable default for many B2B and SaaS campaigns.

What's a good starting adjustment for mobile? There's no universal answer. It depends entirely on your data. If mobile CPA is significantly higher than desktop, starting with -20% to -30% is a reasonable first move. If mobile is performing comparably or better, a neutral or positive adjustment makes more sense. Let the data drive the decision.

Do device adjustments apply to Performance Max campaigns? No. PMax campaigns don't support manual device bid adjustments. Google controls device distribution automatically in Performance Max, and advertisers have no direct lever for device-level bidding in those campaigns.

How do I know if my device adjustment is working? Segment your performance report by device and compare the period before the adjustment to the period after. Look for CPA or ROAS changes on the adjusted device. Use the Compare date range feature in Google Ads to make this easier. Keep in mind that other variables may have changed during the same period, so interpret results with appropriate caution.

Can I set different adjustments for different ad groups in the same campaign? Yes. Ad group-level adjustments override campaign-level ones for that specific group. This gives you granular control when different ad groups have meaningfully different device performance patterns. Use this selectively and only when you have clear data to support the differentiation.

Putting It All Together

Device bid adjustments are one of those Google Ads levers that looks simple on the surface but rewards advertisers who actually dig into the data. The process is straightforward: pull your device performance data, understand what the numbers mean for your specific campaign type, apply adjustments conservatively, and revisit them regularly.

Before you start, run through this quick checklist:

At least 30 to 60 days of conversion data segmented by device. Don't act on less.

Confirmed you're on Manual CPC or Enhanced CPC. If you're on Smart Bidding, device adjustments won't have the impact you expect.

Identified which device has the highest and lowest CPA or ROAS. That gap is your starting point.

Documented your baseline metrics before making changes. You need a before state to measure against.

Set a calendar reminder to review in three to four weeks. Don't let adjustments go stale.

If you're managing multiple campaigns or client accounts, the time it takes to audit and adjust device bids manually adds up fast. Start your free 7-day trial of Keywordme and see how much faster you can move through these optimization tasks right inside Google Ads, without jumping between spreadsheets or dashboards. At $12 per month after the trial, it's one of the more straightforward ways to tighten up your workflow and spend less time on the repetitive parts of PPC management.