Marketing

How to Write Ad Copy with AI

Generate high-converting ad copy for Google, Facebook, LinkedIn, and other platforms with headlines, body, and CTAs.

Ad copy lives or dies on its ability to stop a scroll, convey a benefit, and drive a click — all in under 3 seconds. AI can generate multiple variants across platforms, incorporate proven copywriting frameworks, and tailor message to specific audience segments and funnel stages.

Platform character limits and why they matter

Ad copy is constrained by platform limits that determine structure. Google Search ads: headlines up to 30 characters (3 headlines shown in rotation), descriptions up to 90 characters (2 shown), display URL paths up to 15 characters each. Facebook/Instagram feed: primary text 125 characters shown before 'See more' (the critical visible portion), headline 40 characters, link description 30 characters. LinkedIn Sponsored Content: introductory text 150 characters shown before truncation, headline 70 characters. These limits are non-negotiable — exceeding them causes automatic truncation that breaks the message. Always specify the platform and its current limits in your prompt; AI that knows the constraints writes to the constraint rather than producing copy that needs to be cut.

Copywriting frameworks AI applies to ad copy

AI performs better with ad copy when you specify a copywriting framework. The most reliable frameworks for paid ads: AIDA (Attention/Interest/Desire/Action) — works for cold audience awareness campaigns where you need to build desire before the CTA; PAS (Problem/Agitate/Solution) — highly effective for pain-point-led direct response; Before/After — shows the transformation, works well for service and educational products; Social Proof Led — opens with a customer result or statistic, then explains what made it possible. Specifying the framework prevents AI from defaulting to generic benefit-listing copy that doesn't have a persuasive arc. Each framework works best for a different funnel stage and audience temperature — matching the framework to the objective improves performance significantly.

Generating variants for A/B testing

The most valuable thing AI does for ad copy is generating multiple variants quickly. Rather than writing one ad and hoping it works, AI can generate five headline variants and three body copy variants in seconds — giving you a test matrix that would take a human copywriter an hour. The key is to vary the angle systematically rather than randomly: one variant leads with a benefit, one with a problem, one with social proof, one with urgency, one with a direct call-out to the target audience ('Attention remote teams...'). Testing these variants tells you which angle your specific audience responds to, which is information worth more than any single high-performing ad.

Step-by-step guide

Define audience and offer

Specify the target segment, the offer, and what makes it uniquely compelling for this audience.

Choose the platform

State the ad platform and format — Google search, Facebook feed, LinkedIn sponsored content — for correct character counts.

Apply a copywriting framework

Request copy using AIDA, PAS, or a before-and-after framework to ensure persuasive structure.

Generate multiple variants

Ask for 5 headline variants and 3 body copy variants to enable proper A/B testing.

Ready-to-use prompts

Google Search ad variants

Write Google responsive search ad assets for the following campaign. Product/service: [DESCRIPTION]. Target keyword: [KEYWORD]. Audience: [SPECIFIC AUDIENCE DESCRIPTION]. Unique selling proposition: [PRIMARY USP]. Goal: [CONVERSIONS/TRAFFIC/BRAND].

Generate:
- 5 headlines (max 30 characters each) covering angles: benefit, social proof, urgency, direct call-out to audience, and keyword inclusion
- 3 descriptions (max 90 characters each) covering: feature benefit, proof point, and CTA-led
- 2 display URL path options (max 15 chars each, no spaces)

For each asset, note the angle it represents. After the assets, flag any character count that exceeds the limit.

Why it works

Providing five distinct angle types for headlines gives Google's RSA algorithm meaningful variation to optimize. Flagging character violations prevents the common issue of copy that looks right in a doc but gets truncated in the actual ad.

Facebook ad — PAS framework

Write a Facebook ad for [PRODUCT/SERVICE] targeting [AUDIENCE SEGMENT] at the [COLD/WARM/HOT] audience temperature. Use the PAS (Problem/Agitate/Solution) framework. Output three complete ad variants with different emotional angles: [ANGLE 1, e.g., time scarcity], [ANGLE 2, e.g., social comparison], [ANGLE 3, e.g., financial cost of inaction]. For each variant: primary text (first 125 characters are critical — they must stop the scroll; total under 200 words), headline (under 40 characters), CTA button label from: [Learn More / Shop Now / Sign Up / Get Quote / Book Now]. Also provide: 3 hook image description ideas for each variant (what visual would work with this copy).

Why it works

Providing three emotional angles forces genuine variation rather than superficial word changes. The image description request connects copy to creative direction — ads perform better when copy and visual reinforce the same message.

Practical tips

✦Always specify the platform and its character limits in your prompt — AI calibrates copy length differently for Google, Facebook, and LinkedIn without reminding.
✦Name the copywriting framework you want used (PAS, AIDA, social proof-led) — it forces a persuasive arc rather than generic benefit-listing.
✦Generate at least 5 headline variants with distinct angles (benefit / problem / social proof / urgency / direct call-out) — the winning angle for your audience isn't predictable without testing.
✦Ask AI to write the hook sentence for each ad as a standalone exercise first — the opening line determines whether the rest gets read, and it deserves focused iteration.
✦For Facebook ads, ask for image description ideas alongside the copy — ads where copy and visual reinforce the same message consistently outperform mismatched combinations.