Facebook Ad Copy Generator
Model:
Write Facebook (and Instagram) ad copy that respects platform character caps: Primary text 125 chars (mobile cutoff), Headline 40 chars, Description 30 chars (placement-dependent). 6 objectives (awareness / traffic / leads / conversions / engagement / app installs). Live cap meter colors red when you bust it. Outputs the full Meta Ads Manager set: primary + headline + description + CTA button.
Your Facebook ad
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Write Facebook ad copy with character-cap enforcement (Headline 40, Primary 125, Description 30). Free AI, no signup.
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Use this tool via API
Automate this tool from your own code. OpenAI-compatible REST endpoint, Bearer-token auth, no extra SDK required. Token costs match the web interface.
curl -X POST https://api.free.ai/v1/chat/ \
-H "Authorization: Bearer sk-free-..." \
-H "Content-Type: application/json" \
-d '{"model": "qwen7b", "messages": [{"role": "user", "content": "Write an Instagram caption for a product launch."}]}'Facebook Ad Copy Generator — FAQ
Writes Facebook (and Instagram) ad copy that respects Meta's character caps: Primary text 125 chars (mobile cutoff truncates beyond), Headline 40 chars, Description 30 chars. Pick a campaign objective (conversions / leads / traffic / awareness / engagement / app installs), CTA button (Shop Now / Learn More / Sign Up / etc.), tone, and target audience. Live preview shows how the ad renders in feed; cap meter colors red when you bust it. Optional 3-variant A/B/C output.
Facebook truncates Primary text past 125 chars on mobile with '...See more'. Anything past that is invisible to most viewers. Headline past 40 wraps awkwardly. Description past 30 truncates. Most ChatGPT-generated 'Facebook ads' run 200+ chars in primary and look broken on mobile, where 90%+ of FB traffic happens.
AdCreative.ai ($29-149/month), Anyword ($49-249/month), Pencil ($25-149/month) are full creative platforms with image generation + ad management. Copy.ai ($49/month) and Jasper ($49-125/user/month) are general writing tools. Free.ai is purpose-built for FB ad copy with hard cap enforcement, free. Pair with /design/ for the image creative.
Yes — Qwen 2.5 7B on our GPUs, ~250 tokens for a single ad (more for 3 variants). Free signup gets 10,000 tokens. Premium models produce sharper hooks at higher cost.
Ten standard Facebook CTAs: Shop Now, Learn More, Sign Up, Get Quote, Download, Book Now, Subscribe, Contact Us, Get Offer, Apply Now. The selected CTA shows in the preview and informs the body copy direction.
The system prompt avoids words/phrases Meta's policy review flags: implications about personal attributes ('you have diabetes'), 'guaranteed' results, before/after for weight-loss/health, clickbait sensational language. Always run final copy through Meta's policy preview before launching.
Toggle '3 variants' to get A/B/C ads with three distinct angles: one benefit-led, one social-proof / urgency, one question-led. Drop all 3 into Meta Ads Manager as separate ads in the same ad set — Meta auto-allocates budget to the winner. Standard A/B testing protocol.
No — first ad free. Sign up for 10K tokens.
Yes — IG ads use the same Meta Ad Manager and the same character caps. The preview pane shows Facebook framing; the underlying copy is identical for IG. For IG-only Reels ads, primary text does not display — only the image/video + CTA matters.
Yes — char caps apply per Unicode codepoint, which works in every language. Spanish, Portuguese, Hindi, Arabic, Japanese ad copy all respect the 125/40/30 caps.
No — and we will not try to. Our system prompt biases AWAY from policy-violating language (no claims about personal attributes, no medical-condition implications, no clickbait, no 'guaranteed' outcomes). If your ad gets rejected, the rejection reason from Meta tells you what to revise.
Yes — POST to /v1/chat/ with the FB-ad system prompt (inspect template source for exact prompt). Useful for media-buying agencies generating ad slates for clients. Bearer auth, monthly limits. Docs at /api/.
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