Veo 3 ad script builder (GPT-4 + Google Docs integration)

🚀 Overview

This n8n automation workflow streamlines the creation of professional video ad scripts tailored for Veo 3 by turning basic user inputs into cinematic, consistent, and highly structured prompts.

Whether you're a marketing agency, content creator, or small business, this workflow ensures high-quality AI video generation at scale—without needing a professional copywriter or creative director.

🛠️ How It Works

1. 📝 Form Trigger Captures initial inputs via a web form:

Ad Category: Dropdown (Before & After, Brand Awareness, UGC Style, Educational) Environment: Text (short description of setting/location) Script: Raw ad copy Spokesperson: Basic character idea (e.g., “young woman, confident, skincare expert”) 2. 🧠 Build Persona Node Uses GPT-4o-Mini to expand spokesperson input into a full character description. Output includes: Age Race Clothing Hairstyle Tone/Demeanor Ensures visual consistency in AI-generated video scenes. 3. 🌆 Build Environment Node Transforms environment text into a detailed, cinematic setting. Adds descriptive elements like: Lighting style Architecture or background Atmosphere (e.g., soft morning glow, modern interiors) 4. ✂️ Generate Copy Node Breaks the full script into 10-second readable segments for smooth pacing. Helps tools like Veo 3 maintain flow, coherence, and readability. Outputs concise, camera-ready lines for each section. 5. 📄 Google Docs Integration Auto-updates a ready-to-use script template in Google Docs. Replaces placeholders with content from the 3 AI nodes: Cinematic shot: (Build Persona) in (Build Environment). They confidently address the camera: (Generate Copy). Professional lighting emphasizes credibility throughout. Final result: a polished video ad prompt, ready for Veo 3 or any AI video tool. 💸 Cost Efficiency Advantage

Using the Veo 3 API directly costs $0.50 per second — meaning a simple 5-second video costs $3.75, and a 6-clip project could run up to $24.

However, this workflow is optimized for Veo 3's Fast on Flow mode, which costs just $0.20 per clip.