10 Best AI Ad Copy Generators for Google Ads (RSA) [2026]

Short answer: SEO Runway is the best AI ad copy generator for Google Ads users who want RSA-ready copy (5 headlines and 3 descriptions per request) inside the same workspace where they manage campaigns. Google's automatically created assets are the free built-in option, and Optmyzr has the best RSA builder for PPC specialists. General writers such as Jasper and ChatGPT work if you check the character limits yourself.

Disclosure: SEO Runway is our product. We ranked it using the same criteria as every other tool, and noted where others do better.

Quick picks

• Best inside your Ads workspace: SEO Runway
• Free and built in: Google Ads automatically created assets
• Best for PPC specialists: Optmyzr RSA builder
• Best for brand voice: Jasper
• Best for predicting performance: Anyword

AI ad copy generators compared

*Approximate; verify.

How we chose these tools

We compared each tool's published features, plans and documentation on six criteria: respecting headline (30 characters) and description (90 characters) limits; variants per request; brand voice control; policy-safe output; pushing copy to Google Ads; and price.

1. SEO Runway: best AI ad copy inside your Ads workspace

Verdict: generates RSA copy (5 headlines and 3 descriptions per request) in the same place you manage campaigns, ad groups and keywords, alongside Gemini audits and search-term mining.

Pricing: Google Ads from $29/month; 14-day free trial. See plans.

Pros: RSA-ready lengths; in context with the account.

Cons: no image ad creative; no performance prediction scores.

2. Google Ads automatically created assets: free and built in

Verdict: Google writes headlines and descriptions from your site and ads.

Pros: free; native.

Cons: less control over wording and claims.

3. Optmyzr RSA builder: best for PPC specialists

Verdict: builds and tests RSAs using account data.

Pros: data-driven; pushes to Ads.

Cons: part of a premium suite.

4. Jasper: best for brand voice

Verdict: strong brand voice controls for marketing copy, ads included.

Pros: voice; templates.

Cons: no Ads integration.

5. Copy.ai: best free plan

Verdict: ad templates with a free tier.

Pros: free start.

Cons: manual limit checks.

6. Anyword: best for predicting performance

Verdict: scores copy variants by predicted performance.

Pros: scoring.

Cons: pricing.

7. Writesonic: best general AI writer for ads

Verdict: fast ad variants among many content types.

Pros: versatility.

Cons: not Ads-specific.

8. ChatGPT: most flexible

Verdict: great for brainstorming if you prompt it with the limits.

Pros: flexible; cheap.

Cons: often breaks character limits; no integration.

9. Semrush AI Ad Generator: best with competitor research

Verdict: ad copy informed by competitor ads.

Pros: research context.

Cons: a paid app add-on.

10. AdCreative.ai: best for text plus image creative

Verdict: generates ad images and text for many platforms.

Pros: visuals.

Cons: RSAs aren't its main focus.

What makes a strong RSA

• Up to 15 headlines that each make sense on their own, because Google mixes them.
• Variety: keyword headlines, benefit headlines, proof headlines and call-to-action headlines.
• Pin sparingly: pin only what must appear (for example a legal line).
• Specifics beat adjectives: "Same-Day Repairs in Leeds" beats "Great Repair Service".
• Four descriptions covering offer, proof, process and call to action.

20 headline formulas

1. [Service] in [City]
2. [Number]+ 5-Star Reviews
3. Same-Day [Service]
4. Free [Quote / Trial / Consultation]
5. From $[Price]
6. [Result] in [Timeframe]
7. Trusted Since [Year]
8. Book Online in 60 Seconds
9. No [Pain Point]
10. [Brand] Official Site
11. Compare [Category] Plans
12. [Audience]-Friendly [Product]
13. Open [Hours / Weekends]
14. [Guarantee] Guaranteed
15. Save [X]% Today
16. Award-Winning [Service]
17. Get [Benefit] Fast
18. Licensed & Insured [Trade]
19. Switch From [Competitor Type]
20. Call Now: [Benefit]

Check every claim (reviews, prices, guarantees) before using it. Google requires ad claims to be accurate.

Related guides

• Our full list of Google Ads management tools
• AI SEO writing tools
• AI social media post generators

Frequently asked questions

Can AI write Google Ads?

Yes. AI writes good first drafts of headlines and descriptions quickly. Review every line for accuracy, brand fit and Google's policies before publishing.

How many headlines should an RSA have?

Aim for 10–15 distinct headlines and 4 descriptions. More variety gives Google more combinations to test.

What are the RSA character limits?

Headlines can be up to 30 characters and descriptions up to 90 characters.

Does AI ad copy perform better?

Not automatically. It helps you produce more variants to test; performance comes from relevance, specific offers and testing.

The bottom line

• Google Ads users wanting copy in their Ads workspace: SEO Runway.
• Free: Google's automatically created assets.
• PPC specialists: Optmyzr.
• Brand-voice-heavy teams: Jasper.

Start a 14-day free trial of SEO Runway and generate your first RSA, or see the Google Ads workspace.