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Promote YouTube videos on Reddit with AI-generated comments and email digest

Ari NakosAri Nakos
538 views
2/3/2026
n8n
Official Page

Motivation

Are you a small YT channel looking to grow to 1000 subs ? This workflow has helped me grow to 80 subs via Reddit Marketing. Check out the YT Tutorial.

What it is

This n8n workflow automates the process of promoting your YouTube videos on Reddit. It identifies relevant Reddit posts, generates humanized comments tailored to your video content, and delivers a weekly digest of opportunities directly to your inbox.

How It Works

A user submits their YouTube video URL and email through a form.

The workflow analyzes the YouTube video's title, description, and tags to extract relevant keywords and create a custom AI classification prompt.

It searches Reddit for posts containing those keywords and filters them based on engagement metrics

  1. upvotes > 15
  2. non-empty text content
  3. posted within the last 14 days
  4. upvote ratio > 0.95

An AI agent (using OpenRouter's GPT-4.1-mini) classifies each filtered Reddit post to determine its relevance to your YouTube video.

For relevant posts, another AI agent (using OpenRouter's Gemini-2.0-flash-lite-001) generates a humanized, authentic comment designed to subtly reference your video and add value to the Reddit discussion.

Relevant posts and their proposed comments are stored in Google Sheets.

A professional HTML email digest is generated, summarizing the marketing opportunities.

The email is sent to the user's provided email address.

Setup

To run this workflow, you need to set up credentials in n8n for:

  • YouTube: Uses OAuth 2.0. Connect by authenticating your YouTube account.
  • Reddit: Uses OAuth 2.0. Requires creating an app on Reddit to get a Client ID & Secret. (YT Tutorial)
  • OpenRouter: Generate API key from your OpenRouter account. (YT Tutorial)
  • Google Sheets: Recommend OAuth2 - just connect by authenticating.
  • Gmail: Recommend OAuth 2.0. like Google Sheets

n8n account setup

If you do not have a n8n account, follow the YT Tutorial to get started.

Promote YouTube Videos on Reddit with AI-Generated Comments and Email Digest

This n8n workflow automates the process of promoting new YouTube videos on Reddit, generating engaging comments using AI, and sending a daily email digest of the posted content.

What it does

  1. Triggers on Form Submission: The workflow starts when a new YouTube video URL is submitted via an n8n form.
  2. Fetches YouTube Video Details: It retrieves the title and description of the submitted YouTube video.
  3. Generates Reddit Post and Comments with AI:
    • An AI agent (powered by OpenRouter) is used to generate a suitable Reddit post title and body for the YouTube video.
    • It also generates a set of engaging comments for the Reddit post, ensuring variety and relevance.
    • A structured output parser is used to ensure the AI output is in a usable JSON format.
  4. Posts to Reddit: The generated Reddit post and comments are published to a specified subreddit.
  5. Logs to Google Sheets: Details of each successful Reddit post (YouTube URL, Reddit URL, generated title, description, and comments) are logged into a Google Sheet.
  6. Daily Email Digest:
    • All entries from the Google Sheet for the current day are retrieved.
    • Duplicate entries are removed to ensure a clean digest.
    • An email is composed summarizing the day's Reddit posts, including links to the YouTube videos and Reddit posts.
    • This digest is sent to a predefined email address.
  7. Waits for Next Run: A Wait node is included, likely to control the frequency of the daily digest or to prevent rate limiting.

Prerequisites/Requirements

  • n8n Instance: A running n8n instance.
  • Google Account:
    • Google Sheets Credential: For logging video promotions.
    • Gmail Credential: For sending daily email digests.
  • YouTube API Key: For fetching video details.
  • Reddit Account:
    • Reddit Credential: For posting to subreddits.
  • OpenRouter API Key: For the AI agent to generate post content and comments.

Setup/Usage

  1. Import the Workflow: Import the provided JSON into your n8n instance.
  2. Configure Credentials:
    • Set up your Google Sheets credential.
    • Set up your Gmail credential.
    • Set up your YouTube credential.
    • Set up your Reddit credential.
    • Set up your OpenRouter credential.
  3. Configure Nodes:
    • On form submission (Form Trigger): Customize the form fields if needed.
    • YouTube: Ensure it's configured to fetch details for the submitted video URL.
    • AI Agent: Configure the prompt to guide the AI in generating appropriate Reddit posts and comments. Specify the OpenRouter model to use.
    • Structured Output Parser: Ensure it correctly parses the AI agent's output into the expected JSON structure.
    • Reddit: Specify the target subreddit(s) and ensure the post and comment fields map correctly to the AI-generated content.
    • Google Sheets: Specify the Spreadsheet ID and Sheet Name for logging.
    • Gmail: Configure the recipient email address for the daily digest.
  4. Activate the Workflow: Once configured, activate the workflow.
  5. Submit YouTube Video URLs: Use the n8n form trigger URL to submit new YouTube video links and initiate the promotion process.

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