YouTube Thumbnail Generator with OpenAI & Apify

Description

This n8n workflow automatically generates a custom YouTube thumbnail using OpenAI’s DALL·E based on a YouTube video’s transcript and title. It uses Apify actors to extract video metadata and transcript, then processes the data into a prompt for DALL·E and creates a high-resolution image for use as a thumbnail.

✅ Key Features

📥 Form Trigger**: Accepts a YouTube URL from the user.
🧠 GPT-4o Prompt Creation**: Summarizes transcript and title into a descriptive DALL·E prompt.
🎨 DALL·E Image Generation**: Produces a clean, minimalist YouTube thumbnail with OpenAI’s image model.
🪄 Automatic Image Resizing**: Resizes final image to YouTube specs (1280x720).
🔍 Apify Integration**: Uses two Apify actors:
Youtube-Transcript-Scraper to extract transcript
youtube-scraper to get video metadata like title, channel, etc.

🧰 What You'll Need

OpenAI API Key**
Apify Account & API Token**
YouTube video URL**
n8n instance (cloud or self-hosted)**

🔧 Step-by-Step Setup

1️⃣ Form & Parameter Assignment
Node**: Form Trigger
How it works**: Collects the YouTube URL via a form embedded in your n8n instance.
API Required**: None
Additional Node**: Set
Converts the single input URL into the format Apify expects: an array of { url } objects.

2️⃣ Apify Actors for Data Extraction
Node**: HTTP Request (Query Metadata)
URL: https://api.apify.com/v2/acts/streamers~youtube-scraper/run-sync-get-dataset-items
Payload: JSON with startUrls array and filtering options like maxResults, isHD, etc.
Node**: HTTP Request (Query Transcript)
URL: https://api.apify.com/v2/acts/topaz_sharingan~Youtube-Transcript-Scraper/run-sync-get-dataset-items
Payload: startUrls array
API Required**: Apify API Token (via HTTP Query Auth)
Notes**: You must have an Apify account and actor credits to use these actors.

3️⃣ OpenAI GPT-4o & DALL·E Generation
Node**: OpenAI (Prompt Creator)
Uses the transcript and title to generate a DALL·E-compatible visual prompt.
Node**: OpenAI (Image Generator)
Resource: image
Model: DALL·E (default with GPT-4o key)
API Required**: OpenAI API Key
Prompt Strategy**:
Create a minimalist YouTube thumbnail in an illustration style. The background should be a very simple, uncluttered setting with soft, ambient lighting that subtly reflects the essence of the transcript. The overall mood should be professional and non-cluttered, ensuring that the text overlay stands out without distraction. Do not include any text.

4️⃣ Resize for YouTube Format
Node**: Edit Image
Purpose**: Resize final image to 1280x720 with ignoreAspectRatio set to true.
No API required** — this runs entirely in n8n.

👤 Created By
Robert Breen
Automation Consultant | AI Workflow Designer | n8n Expert
📧 [email protected]
🌐 ynteractive.com
🔗 LinkedIn

🏷️ Tags
openai dalle youtube thumbnail generator apify ai automation image generation illustration prompt engineering gpt-4o