Google Ads Ad Copy: Complete Guide for 2026

Writing effective Google Ads copy has never been just about creativity. In 2026, it also requires understanding how Responsive Search Ads (RSAs) work, what the algorithm does with your headlines, how AI Max Text Guidelines let you control what AI can write for you, and why the retirement of ETAs in 2022 changed the way you run A/B tests.

This guide updates the fundamentals with what really matters in 2026.

1. Understanding your audience
2. The RSA ad structure in 2026
3. Writing headlines that convert
4. Writing effective descriptions
5. AI and automatic copy: how to stay in control
6. Keyword optimisation
7. Assets: expand your ad’s footprint
8. A/B testing in 2026: without ETAs but with per-asset data
9. Common ad copy mistakes

Understanding your audience

The starting point for any effective ad copy is knowing who it’s aimed at.

1. Define your target audience: demographics (age, location, job title in B2B), but above all their search intent. What problem are they trying to solve when they search the term that triggers your ad?
2. Identify pain points and motivations: what’s stopping them? Price, mistrust, urgency? Mentioning the most common objection directly in the ad copy can significantly increase click-through rates.
3. Speak their language: avoid your industry’s technical jargon if your customers don’t use it. A good exercise: copy phrases verbatim from customer reviews and use them as headlines.
4. Filter out the wrong traffic: the ad isn’t just for attracting clicks — it’s also for repelling clicks that won’t convert. Include explicit qualifiers (“Businesses only”, “From £200/month”) to reduce the cost of unqualified clicks.

The RSA ad structure in 2026

Since the retirement of Expanded Text Ads (ETAs) in June 2022, the standard Search format is the Responsive Search Ad (RSA). Google automatically combines your headlines and descriptions to show the most relevant variation to each search.

Limits and capabilities

• Headlines: up to 15, maximum 30 characters each
• Descriptions: up to 4, maximum 90 characters each
• Google selects and combines up to 3 headlines and 2 descriptions per impression

How many assets to provide

The practical minimum to reach a “Good” or “Excellent” Ad Strength rating:

• At least 10 headlines (better to use all 15)
• 4 descriptions (the maximum available)

Ad Strength is not a performance indicator — it’s a checklist of Google’s preferences. An ad rated “Poor” can outperform one rated “Excellent” in conversions. Use it as a setup tool, not an optimisation KPI.

Asset diversity

Google won’t combine headlines that are too similar to each other. To make the most of automatic rotation, ensure your 15 headlines cover distinct angles:

• With keywords (at least 3 headlines): include the primary search term
• Benefits or USPs: speed, guarantee, price, concrete result
• Brand or differentiator: company name, certification, years of experience
• Active CTAs: “Get your quote”, “Speak to an expert today”, “Free trial”
• Emotional angle or urgency: “Solve [problem] today”, “No commitment required”

Pinning headlines

Pinning a headline to a specific position tells Google it must always appear there. Google discourages this because it reduces testable combinations and lowers Ad Strength.

When pinning makes sense:

• Legal or regulatory notices that must always appear
• Regulated sectors (healthcare, finance) where you can’t let AI choose the message
• Brands with very strict style constraints

If you pin, add 2–3 variants in the same position so Google can rotate within the pin without losing all flexibility.

Writing headlines that convert

The headline is what the user reads first. You have 30 characters to differentiate yourself from every other advertiser.

Principles that work in 2026:

• Be relevant to the intent: if someone searches “emergency plumber London”, your headline should say exactly that. Relevance beats creativity.
• Be specific: “Up to 40% cheaper than your current provider” converts better than “Competitive prices”.
• Create real urgency: “Limited availability”, “Response within 2 hours” — but only if it’s true. False promises generate clicks that don’t convert.
• Ask a question: “Paying too much for your business insurance?” triggers curiosity and the click.

Examples by sector:

• eCommerce: “Next-day delivery · No minimum order”, “Free returns for 30 days”
• Local services: “Emergency Plumber London · Free call-out”, “Certified electrician within 2h”
• B2B / SaaS: “Cut your CPA by 30% · No commitment”, “HR software for teams of 50+”
• Healthcare: “Free first consultation · No waiting lists”, “Certified online therapist”

Writing effective descriptions

Descriptions (90 characters) are where you develop the argument that started in the headline. Use all 4 available and make them completely distinct from each other.

What each description should do:

• Description 1: main value proposition and key differentiator
• Description 2: overcome the main objection (price, trust, delivery time)
• Description 3: social proof or guarantee (“500+ clients across the UK”, “30-day money-back guarantee”)
• Description 4: strong CTA with an urgency or exclusivity element

Common mistakes:

• Repeating information from the headline
• Using the whole description on a single generic argument (“We’re the best company in the sector”)
• Not including a CTA in any description

AI and automatic copy: how to stay in control

Google generates copy automatically in two main contexts:

1. AI Max for Search: generates headlines and descriptions in real time, tailored to each specific search, based on your landing page content and existing assets.
2. Performance Max: creates complete ad variations across all Google channels.

The risk of automatic generation

Without restrictions, Google may write headlines that don’t fit your brand tone, make promises you can’t keep, or confusingly mix different services.

AI Max Text Guidelines (globally available since February 2026)

Text Guidelines are the control mechanism for AI Max. You have two tools:

A. Term Exclusions (up to 25 per campaign)

• Words or phrases that must never appear in automatically generated copy
• Example: “free” (if you have no free offer), “urgent” (if your response time is standard)
• Apply by exact match: “low cost” does not block “lowest cost”
• Language-specific: enter them in the campaign’s language

B. Messaging Restrictions (up to 40 per campaign)

• Natural language instructions about tone and content
• Example: “Never mention specific prices”, “Always use formal tone”, “Do not compare with competitors”
• Apply across all ad languages even if written in English

Setup path: Campaign settings → AI Max → Asset optimisation → Text customisation → Add Text Guidelines

If you have AI Max active, configuring Text Guidelines is not optional. The difference is between an AI that reinforces your brand and one that writes whatever it likes.

Keyword optimisation

Include your primary keyword in at least 3 of your 15 headlines. Google bolds terms that match the user’s search, increasing visual relevance and click-through rate.

Use Google Ads match types to control when your ads show:

• Exact match: maximum control, minimum volume; for very specific audiences
• Phrase match: balance between control and volume
• Broad match: maximum reach; use only with well-configured negative keywords and active Smart Bidding

Keywords on the landing page: the destination page your ad points to must include the same keywords. This improves Quality Score and can reduce CPC.

Negative keyword list from day one: systematically block:

• Free, tutorial, how to, DIY, what is, average price, wikipedia
• Competitor brand names (if you don’t want to appear on brand searches)
• Location modifiers outside your coverage area

Review the Search Terms Report weekly to expand your negative list. It’s the best source of information about what people actually search before seeing your ads.

Assets: expand your ad’s footprint

Assets (formerly called extensions) are free and only serve when Google predicts they’ll improve performance. More asset types = larger visual footprint on the SERP.

Priority assets:

• Sitelinks (4–10): links to key pages (contact, star product, pricing, testimonials). Add 2 description lines to each sitelink to maximise space.
• Callouts (4–10): USPs in 25 characters. “Free shipping”, “No contract”, “2-year guarantee”
• Structured snippets: list of services, products, or brands. Minimum 3 values.

High-impact assets in 2026:

• Images: shown alongside ads in mobile searches. Add 3–5 high-quality images.
• Lead form assets: capture leads directly from the SERP without the user visiting your site — very effective on mobile for service businesses.
• Prices: show prices by product or service; pre-filters unqualified clicks before they reach your landing.
• Promotions: for time-limited offers — deadline urgency improves CTR.

Set up assets at account level first for maximum coverage. Override at campaign or ad group level for specificity.

A/B testing in 2026: without ETAs but with per-asset data

With ETAs retired in 2022, classic A/B tests (ad A vs ad B identical except for one element) are no longer straightforward. But there are equivalent methods.

Method 1: Google Ads Experiments (native A/B test)

Go to the Experiments tab → Create an experiment from an existing campaign → 50/50 traffic split → Change only the RSA copy (keep keywords, bids, and audiences identical).

Google notifies you when results reach statistical significance. Recommended minimum for reliable results: 10,000 impressions/month.

Method 2: Partially pinned RSA (pseudo-ETA)

Create two RSAs in the same ad group:

• RSA A: pin Headline 1 (brand/constant) and Headline 3 (CTA); vary only Headline 2 with angle A
• RSA B: same anchors; vary Headline 2 with angle B

Google rotates between both and you get comparative data on the variable element. If you pin to a position, add at least 2–3 variants per position to maintain some flexibility.

Method 3: Per-asset individual data (available since June 2025)

Since June 2025, Google provides click and conversion data per individual headline and description within an RSA. You no longer need to infer which asset is working; you can see it directly.

Review this data monthly:

• Assets labelled “Best”: maintain and expand that message angle
• Assets labelled “Low”: replace with new variants

The metrics that matter are conversion rate and cost/conversion per asset, not CTR in isolation.

Common ad copy mistakes

Generic headline that doesn’t differentiate. “Industry-leading company” doesn’t tell the user why they should click on you specifically. Be specific: what result, in what timeframe, for whom.

All headlines say the same thing. If your 15 headlines are variations of the same argument (price), Google can’t combine complementary headlines and your RSA loses potential. Cover at least 4–5 distinct angles.

No negative keywords. Without negatives, you pay for clicks from people searching for something different from what you offer. It’s the most obvious waste in new or poorly managed accounts.

Mismatch between ad and landing page. If the headline promises “Response within 2 hours” but the landing page doesn’t mention it, the user bounces. The ad copy and landing page copy must be consistent on the main message.

Running AI Max without Text Guidelines. If you have AI Max active without restrictions, the AI can generate copy variants outside your control. Always configure your term exclusions and messaging restrictions before activating it.

Not reviewing the asset report. Per-asset individual data (available since June 2025) is the most valuable copy optimisation tool available today. Reviewing it monthly and replacing “Low”-labelled assets is the highest-ROI time investment in RSA management.

If you’d like to review the copy structure and assets in your Google Ads account, or start from scratch with a well-defined setup, I work as a freelance Google Ads consultant specialising in local businesses, hospitality, and B2B. Book a free audit.

Sources

1. Responsive Search Ads Best Practices 2026 — Search South
2. Google AI Max Text Guidelines — Search Engine Land
3. Google Ads RSA Headline Performance Data — Search Engine Land
4. About Ad Strength for Responsive Search Ads — Google Ads Help
5. AI-Generated vs Human-Written RSA Performance — Groas.ai
6. Google Ads Character Limits Guide — Fraud Blocker
7. A/B Testing in Google Ads: Full 2026 Guide — Young Urban Project