A Performance Max campaign is a goal-based Google Ads campaign type that serves ads on Search, Shopping, YouTube, Display, Discover, Gmail and Maps from one campaign and one budget. You set the conversion goals, budget and creative, and Google's AI decides the bid, the channel and the ad combination for every auction.
This guide is part of the Google Ads hub. It covers how the campaign type works, what it automates and how it overlaps with Search and brand campaigns. The short recommendation: keep brand terms and must-win queries in exact match Search, and add Performance Max only when conversion goals are reliable, conversion volume is steady and real creative or a clean product feed is ready. For the wider set of automated features, see Google Ads AI.
How does a Performance Max campaign work?
A Performance Max campaign works by pairing your conversion goals with Smart Bidding and letting Google's AI choose the channel, the audience and the asset combination for each auction. You supply the inputs: goals and their values, a budget, an optional CPA or ROAS target, asset groups, a product feed if you sell products, and audience signals.
Smart Bidding is Google's set of automated bid strategies that set a bid per auction from the predicted chance or value of a conversion. In the bidding step of campaign setup, you choose between Conversions and Conversion value, with an optional target CPA or target ROAS. The optional "Bid for new customers only" setting needs an audience segment with at least 1,000 active members.
An audience signal is a hint, such as a customer list or past site visitors, that tells the campaign where to start looking. It is not targeting: Google states that "Performance Max campaigns don't limit your ads to a selected set of audiences."
Billing follows each placement: per Google's page on Performance Max costs, YouTube instream ads are billed per thousand impressions and Display ads on clicks. Google reports 27% more conversions or value at a similar CPA or ROAS for advertisers who adopt it (Google data, October to November 2023).
What goes into an asset group, and what are the Performance Max specs?
An asset group is a set of headlines, descriptions, images, logos and videos built around one theme or audience, which Google combines into ads for every channel. As of October 2026, Google's specs require at least 3 headlines, 1 long headline, 2 descriptions, a business name, a square logo and both square and horizontal images in each asset group.
The limits below come from Google's Performance Max specs and format requirements:
| Asset | Limit | Minimum to maximum | Required |
|---|---|---|---|
| Headlines | 30 characters, one of 15 or fewer | 3 to 15 (11 or more recommended) | Yes |
| Long headlines | 90 characters | 1 to 5 | Yes |
| Descriptions | 90 characters | 2 to 5 | Yes |
| Business name | 25 characters | 1 | Yes |
| Horizontal image (1.91:1) | 1200 x 628 recommended, 5 MB | up to 20 | Yes |
| Square image (1:1) | 1200 x 1200 recommended, 5 MB | up to 20 | Yes |
| Vertical image (4:5) | 960 x 1200 recommended | up to 20 | No |
| Square logo (1:1) | 1200 x 1200 recommended | 1 to 5 | Yes |
| Videos (16:9, 1:1, 9:16) | 10 seconds or longer | up to 15 | No |
If you upload no video, Google may generate videos from your other assets; the spec page says your own videos in all three orientations are needed for "Excellent" Ad Strength. Retail campaigns add a Merchant Center feed, and the linked Merchant Center account cannot be changed after the campaign is created.
Search themes are short phrases that tell an asset group which searches matter; Google raised the cap from 25 to 50 per asset group in its August 2025 update. To compare two sets of creative inside one asset group, use Performance Max asset testing.
What is automatically optimized in a Performance Max campaign, and what can you control?
A Performance Max campaign automatically optimizes the bid, the channel, the placement, the audience and the asset combination for each impression. You still control the goals and their values, the budget and target, locations and languages, the assets and feed, negative keywords, brand exclusions and three creative automation settings that you can switch off.
The three creative automation settings sit at campaign level, per the Performance Max overview:
- Text customization writes extra headlines and descriptions from your landing page, domain and existing ads.
- Final URL expansion sends traffic to a page on your site that Google finds more relevant than the final URL you set.
- Auto-generated videos create video ads from your images and text when you upload none.
Negative keywords in Performance Max can be added per campaign or through a shared list, and they apply to Search and Shopping inventory only. Google's August 2025 update added campaign-level negative keyword lists, search terms reporting for all campaigns and device targeting. The cap on negative keywords is not on a Google help page: PPC Land reported in March 2025 that Ginny Marvin, Google's Ads Product Liaison, announced a rise from 100 to 10,000. Before adding negatives, an impact preview estimates the conversions you would lose, for up to 10 keywords at a time.
Does a Performance Max campaign take traffic from your Search and brand campaigns?
A Performance Max campaign can take traffic from Search, except on exact matches. When a query is identical to an exact match keyword in a Search campaign, Google prefers the Search campaign. In every other overlap, including phrase and broad match keywords, Standard Shopping and Demand Gen, the campaign with the higher Ad Rank serves the ad.
Google sets out these rules in how Performance Max interacts with other campaigns, and the Performance Max overview adds that search themes have the same priority as phrase and broad match keywords.
Brand searches are the most common overlap. Brand conversions are cheap and many would happen without an ad, so they make Performance Max look better than the new business it adds. Brand exclusions stop Performance Max from serving on chosen brand queries, but only on Search, Shopping and YouTube search inventory. A checkbox, "Allow Shopping ads on searches that mention excluded brands," lets product ads keep showing on those searches.
To see the overlap, open the search terms report for Performance Max, which holds data from March 2023. How much credit those brand conversions get depends on your attribution model, and a Google Ads Conversion Lift study tells you whether the conversions are truly incremental.
Why does Performance Max spend so much on Display and YouTube?
Performance Max spends on Display and YouTube when its model predicts the best return there for the goals you set, because Google evaluates the campaign as a whole rather than channel by channel. Google's cost page confirms that budget follows predicted return across channels.
Practitioners on r/PPC and r/GoogleAdsDiscussion raise this often; the usual cause is the goal, not the channel: if page views or unqualified form fills count as primary conversions, cheap Display and YouTube traffic supplies them and the bidder follows.
The channel performance report shows spend and results per channel, Search partners included, for dates after June 6, 2025.
Three levers move spend: keep only revenue or qualified lead actions as primary goals, block unwanted Display and Video topics with excluded content keywords, and use the priority tiers and optional budget allocations for Search partners and the Display Network listed in the Performance Max overview as of October 2026.
Performance Max vs Search vs Standard Shopping: which should you use?
Use Search for the high-intent queries you must see and control, Standard Shopping when you need product-level control over a feed, and a Performance Max campaign for extra conversions beyond both. Performance Max fits only when conversion data, creative and brand protection are in place, so treat it as an addition you test, not a default.
A Search campaign is a Google Ads campaign that shows text ads on Google search results for the keywords you choose. Standard Shopping is a Google Ads campaign type that shows product ads from a Merchant Center feed, with bids set per product group.
| Criterion | Performance Max | Search | Standard Shopping |
|---|---|---|---|
| Inventory | All Google Ads channels from one campaign | Search results (and optional Search partners) | Shopping inventory from a Merchant Center feed |
| Query control | Search themes, negatives, brand exclusions | Keywords by match type, negatives | Product groups, negatives |
| Priority on exact queries | Loses to an exact match Search keyword | Exact match wins over Performance Max | Higher Ad Rank serves |
| Channel visibility | Channel performance report | Full, one channel | Full, one channel |
| Creative needed | Text, images, logos, ideally video, or a feed | Text ads | Product feed |
| Fits when | Goals are reliable and you want reach beyond Search | Intent and query control matter most | You need tight control per product |
The PMax Fit Test is a four-gate decision rule: a Performance Max campaign fits an account only when all four gates pass.
- Measurement. Primary conversion goals are revenue or qualified leads, with values that reflect what each conversion is worth.
- Signal volume. The account already converts steadily on Smart Bidding. Google publishes no minimum for Performance Max.
- Creative or feed. You can fill an asset group with real images and video, or you sell from a clean Merchant Center feed.
- Protected money queries. Brand terms and your best converting queries sit in exact match Search, and a brand exclusion list is ready.
When one gate fails, fix it in Search or Standard Shopping first. When all four pass, test Performance Max in an experiment. For retailers, Google offers a one-click experiment from a Standard Shopping campaign and reports that advertisers who switched saw 25% more conversion value at a similar ROAS on average, based on Google data from October 2022 to March 2023.
How do you set up a Performance Max campaign step by step?
Setting up a Performance Max campaign follows Google's six steps: choose a goal, set bidding, set campaign settings, build an asset group, set the budget, then review and publish. The work that decides results happens before step one, in the conversion goals and brand controls that the campaign will optimize toward.
- Clean up conversion goals first. Mark only revenue or qualified lead actions as primary and check that values are correct.
- Choose the goal and campaign type. Pick a goal such as Sales or Leads, then Performance Max, and link Merchant Center for products.
- Set bidding. Choose Conversion value when you track values, otherwise Conversions, and add a target only if history supports it.
- Set campaign settings. Choose locations and languages, attach a brand exclusion list and decide on the creative automation settings.
- Build one asset group per theme. Meet the specs, add audience signals and search themes, and use product filters for a feed.
- Set the budget. The review page shows up to three daily budgets, Low, Medium and High, and Google calls Low the minimum it recommends.
- Publish and wait. Leave targets, budget and assets alone for at least one to two conversion cycles before you judge results.
For bulk edits, Google Ads Editor is faster than the web interface.
Common mistakes with a Performance Max campaign
The most common Performance Max mistakes come from the inputs, not from the campaign type: goals that reward cheap actions, brand traffic that inflates results, and judgment based on the wrong comparison. Each one makes the campaign look better or worse than the business result it actually delivers.
- Counting micro conversions as primary goals. Page views and add to carts teach the bidder to buy cheap Display and YouTube traffic. Keep them as secondary goals.
- Leaving brand searches open. Brand conversions make ROAS look strong without adding new business. Add brand exclusions and keep brand in exact match Search.
- Expecting broad match Search to be protected. Only exact match keywords take priority. Move must-win queries to exact match.
- Skipping the PMax Fit Test. Launching on thin conversion data or without real creative gives the system little to work with. Fix the failing gate in Search or Shopping first.
- Judging with a before and after comparison. Seasonality and brand demand distort that view. Use an experiment or a lift study, and check costs in the guide to Google Ads cost.
- Changing settings every few days. Each change adds noise. Batch changes and review them in a regular Google Ads audit.
