Google AI Max for Search Campaigns: Text Guidelines, Brand Controls & What Changes for Advertisers in 2026

What Is AI Max for Search Campaigns?

AI Max for Search campaigns is Google's most significant upgrade to Search advertising since the introduction of Responsive Search Ads. Launched in open beta in May 2025 and expanded with text guidelines for all advertisers in February 2026, AI Max brings a suite of AI-powered features directly into your existing Search campaigns.

Unlike Performance Max — which runs across all Google channels with limited transparency — AI Max enhances your Search campaigns while preserving keyword-level control and reporting. It is designed to help advertisers find more relevant queries, generate better ad copy, and optimize landing page selection, all powered by Google's AI models.

"AI Max is not a new campaign type. It is a feature layer you activate on top of your existing Search campaigns. Your keywords, ad groups, and bidding strategies stay intact."

The core promise: more conversions at a similar CPA/ROAS, without rebuilding your campaign structure. But there are compliance implications that every advertiser — especially those in regulated industries — needs to understand before flipping the switch.

How AI Max Works: The Three Core Features

AI Max bundles three distinct AI capabilities into a single toggle. Understanding each one is critical for managing both performance and compliance risk.

1. Search Term Matching (Keyword Expansion)

AI Max uses broad match and keywordless technology to expand beyond your existing keywords. Google's AI analyzes your current keywords, ad copy, and landing pages to identify semantically related queries you are not currently bidding on.

This is the highest-impact feature — and the highest-risk from a compliance perspective. AI Max can match your ads to queries you never explicitly targeted. For healthcare advertisers, this means your ad could appear for symptom-related searches. For finance brands, it could match to queries implying guaranteed returns.

2. Text Customization (AI-Generated Ad Copy)

AI Max generates ad headline and description variations dynamically, tailored to each user's search query. It pulls signals from your existing assets, keywords, and landing page content to create copy that matches search intent more precisely.

The AI does not simply shuffle your existing headlines. It writes new copy based on what it learns from your campaign. This is where text guidelines become essential — without them, the AI operates with minimal constraints on what it can write.

3. Final URL Expansion

When enabled, AI Max can redirect users to different landing pages on your domain — ones it determines are more relevant to the search query. If someone searches for a specific product and your ad normally sends them to a category page, AI Max may send them directly to the product page instead.

This improves conversion rates but creates a compliance risk: the AI may select landing pages that do not have the required disclaimers, disclosures, or regulatory content that your primary landing page includes.

Text Guidelines: Controlling AI-Generated Ad Copy

As of February 26, 2026, text guidelines are available to all advertisers globally, across both AI Max for Search and Performance Max campaigns, with full language and vertical support.

Text guidelines are a governance layer on top of text customization. While text customization generates the copy, text guidelines define what the AI is and is not allowed to write.

How Text Guidelines Work

You write natural language instructions that constrain the AI's creative output. These are not keyword lists — they are human-readable rules that Google's AI interprets and follows when generating ad copy.

Example Instructions:

Text Guidelines vs Term Exclusions

Google also provides term exclusions — a list of up to 25 specific words or phrases per campaign that the AI must never use in generated copy. While text guidelines are flexible natural language rules, term exclusions are hard blockers.

Best practice: Use term exclusions for absolute no-go words (competitor names, regulated terms) and text guidelines for tone, style, and broader compliance rules.

Brand Controls: Inclusions, Exclusions & Safeguards

Beyond text guidelines, AI Max provides several brand safety controls that advertisers should configure before enabling the feature.

Brand Inclusions & Exclusions

Brand inclusions restrict AI Max's search term matching to only show your ads when searches include your specified brand terms. Brand exclusions prevent your ads from appearing on searches that include competitor or unrelated brand names.

URL Exclusions

If you enable final URL expansion, you can exclude specific URLs or URL patterns from AI Max's landing page selection. This is critical for:

• Pages without required legal disclaimers
• Internal pages not intended for ad traffic
• Pages with outdated pricing or promotions
• Thank-you or confirmation pages

Search Themes

AI Max allows you to provide search themes — descriptive phrases that guide the AI toward relevant search queries. Think of these as directional signals rather than keywords. For example, "enterprise cybersecurity solutions" tells AI Max to focus on B2B security queries rather than consumer antivirus searches.

AI Max vs Performance Max: Key Differences

This is the most common question advertisers ask. Here is the definitive comparison:

"AI Max gives you the automation benefits of Performance Max but within the Search channel only — with the keyword visibility and control that Search advertisers have always relied on."

Performance Data: What the Numbers Say

Google's official benchmarks and early adopter data paint a clear picture:

• 14% more conversions (or conversion value) at a similar CPA/ROAS — Google's headline stat across all AI Max advertisers
• 27% uplift for campaigns still primarily using exact and phrase match keywords — AI Max's broad match expansion has the largest impact here
• BYD (electric vehicles): 24% increase in leads, 26% decrease in cost per lead — one of Google's flagship case studies

However, these numbers come with caveats. Performance uplift is measured against campaigns without AI Max, not against well-optimized broad match campaigns. Advertisers already running aggressive broad match strategies may see smaller gains.

What Independent Tests Show

Independent testing from agencies and advertisers reveals more nuanced results:

• Campaigns with tight, well-researched keyword sets see the largest gains from search term matching
• Text customization improves CTR but may reduce conversion quality if not constrained by text guidelines
• Final URL expansion works best for e-commerce with deep product catalogs but can hurt lead-gen campaigns with single-offer landing pages

Compliance Risks: What Can Go Wrong

AI Max introduces a fundamentally new compliance challenge: your ads may say things you never wrote or approved. For advertisers in regulated industries, this is a critical risk that must be managed proactively.

Risk 1: AI-Generated Medical or Financial Claims

If your landing page mentions clinical results, the AI may incorporate those claims into ad copy — even if the ad copy would violate platform policy or regulatory requirements. Without text guidelines, there is no barrier preventing the AI from writing "Clinically proven to reduce symptoms by 40%."

Risk 2: Irrelevant Search Term Matching

AI Max's broad match expansion can match your ads to queries that are contextually related but compliance-problematic. A supplement brand targeting "energy support" could be matched to "stimulant alternatives" or "ADHD focus supplements."

Risk 3: Unapproved Landing Pages

Final URL expansion may send users to pages that lack required disclaimers, privacy notices, or regulatory disclosures. If your compliance team approved specific landing pages for specific claims, AI Max's URL expansion can silently bypass that approval.

Risk 4: Brand Voice Inconsistency

AI-generated copy may not match your brand's tone, terminology, or positioning. For regulated brands where specific language has been legally reviewed, this creates both brand and legal risk.

Mitigation Framework

How to Set Up AI Max (Step-by-Step)

Enabling AI Max is straightforward, but configuring it properly for compliance requires a deliberate approach.

Step 1: Enable AI Max on Your Search Campaign

Navigate to your Search campaign settings. Look for the "AI Max" section (currently in beta). Toggle it on. This activates all three features: search term matching, text customization, and final URL expansion.

Step 2: Configure Text Guidelines

Before AI Max generates any copy, add your text guidelines. Go to the campaign's asset section and find "Text guidelines." Write clear, specific instructions:

• State what the AI must always include (brand name, value proposition)
• State what the AI must never say (medical claims, price guarantees, competitor names)
• Define the tone and style (professional, casual, technical)

Step 3: Set Term Exclusions

Add up to 25 words or phrases per campaign that the AI must never use. Focus on:

• Regulated terms in your industry
• Competitor brand names
• Superlative claims ("best," "cheapest," "#1")

Step 4: Configure Brand Controls

Set brand inclusions and exclusions under your campaign settings. If you only want to appear on branded searches, use brand inclusions. To prevent appearing alongside competitor brands, use brand exclusions.

Step 5: Manage Final URL Expansion

Decide whether to enable final URL expansion. If you do, add URL exclusion rules for any pages that are not compliance-approved. If your compliance team has approved only specific landing pages, consider disabling this feature entirely.

Step 6: Monitor the Search Terms Report

For the first 2-4 weeks after enabling AI Max, review the search terms report daily. Look for:

• Queries outside your intended targeting scope
• Queries that imply claims you cannot substantiate
• Competitor brand terms appearing in your matched queries

Add negative keywords aggressively during this initial learning period.

Industry-Specific Impact: Healthcare, Finance & iGaming

Healthcare & Supplements

AI Max poses the highest compliance risk for healthcare advertisers. Google already requires LegitScript certification for certain healthcare ads, and AI-generated copy could easily cross the line into unapproved medical claims. Required actions:

• Add text guidelines blocking all medical claim language (cure, treat, diagnose, prevent)
• Exclude terms: specific drug names, symptom descriptions, dosage information
• Disable final URL expansion unless all landing pages are compliance-reviewed
• Review search terms report for symptom-matching queries weekly

Finance & Crypto

Financial services advertisers face regulatory requirements from FCA, SEC, FINRA, and local regulators. AI-generated ad copy implying guaranteed returns, risk-free investments, or specific performance numbers is a direct regulatory violation. Required actions:

• Text guideline: "Never imply guaranteed returns, specific percentage gains, or risk-free outcomes. Always include that investments carry risk."
• Exclude terms: guaranteed, risk-free, no-loss, specific percentages
• Ensure all landing pages include required risk disclaimers before enabling URL expansion

iGaming & Gambling

Gambling advertisers operate under the strictest geo-specific regulations. AI Max's search term matching could inadvertently serve ads in restricted jurisdictions or to underage audiences. Required actions:

• Maintain strict geo-targeting alongside AI Max
• Text guideline: "Always include responsible gambling messaging. Never target minors or imply guaranteed winnings."
• Exclude terms: sure bet, guaranteed win, no-risk betting
• Monitor for cross-jurisdictional query matching

E-commerce & DTC

E-commerce brands benefit the most from AI Max with the lowest compliance risk. Final URL expansion can significantly improve conversion rates by matching users to relevant product pages. Recommended approach:

• Enable all three AI Max features
• Use text guidelines for brand voice consistency
• Exclude out-of-stock or seasonal product pages from URL expansion
• Monitor for FTC compliance if making any performance or comparison claims

Action Checklist for Compliance Teams

Before enabling AI Max for Search campaigns, walk through this checklist:

1. Audit your existing ad copy — identify all claims, terms, and language that are legally reviewed and approved. These become your text guidelines baseline.
2. Write text guidelines — translate your compliance rules into natural language instructions that Google's AI can follow.
3. Set term exclusions — compile a list of the 25 most critical terms that must never appear in AI-generated copy.
4. Configure brand controls — set inclusions and exclusions to prevent unwanted brand associations.
5. Decide on final URL expansion — if only specific pages are compliance-approved, either disable URL expansion or set URL exclusion rules.
6. Establish monitoring cadence — review search terms and ad copy variations weekly for the first month, then bi-weekly.
7. Document your AI Max governance — record what guidelines, exclusions, and controls are in place, and who is responsible for monitoring.
8. Test incrementally — enable AI Max on one campaign first, monitor for 2-4 weeks, then expand to additional campaigns.

AI Max for Search campaigns is a powerful tool that can drive significant performance gains. But for compliance-conscious advertisers, the default settings are not enough. The combination of text guidelines, term exclusions, brand controls, and active monitoring is what turns AI Max from a compliance risk into a competitive advantage.

Track Google Ads policy changes that affect AI Max and other campaign types with the AuditSocials Policy Tracker. Use our Google Ads Compliance Rules to audit your campaigns before enabling AI automation features.