Convert Reddit threads into short vertical videos with AI

Who is this for?

This workflow is ideal for:

• Content creators and video editors automating short-form content production
• Reddit storytellers converting text posts into engaging TikTok, YouTube Shorts, or Reels
• Social media managers repurposing community discussions into visual narratives

What problem is this solving?

Manually converting Reddit posts into vertical video content is time-consuming:

• You have to read, summarize, write a script
• Generate TTS
• Find stock footage
• Edit everything in a timeline

This workflow automates the full pipeline. It converts any Reddit thread into a polished video with:

• TTS narration
• Subtitle overlays
• B-roll from Pexels
• Automatic rendering via Shotstack

What this workflow does

This workflow:

1. Extracts Reddit post and comments via Reddit API
2. Summarizes the thread into structured clips using OpenAI
3. Generates search queries for each clip for stock footage
4. Queries Pexels API for relevant vertical videos
5. Generates TTS audio for each clip using OpenAI Whisper
6. Creates subtitles matching the audio
7. Uploads footage/audio to Shotstack
8. Renders a full vertical video (720x1280) with synced TTS, subtitles, and b-roll
9. Returns a final video URL

Setup

• Create accounts and API keys for:
  • Reddit Developer App
  • OpenAI
  • Pexels
  • Shotstack
• Add credentials in n8n:
  • Reddit (HTTP Basic Auth)
  • OpenAI (API Key)
  • Shotstack (HTTP Header Auth)
  • Pexels (HTTP Header Auth)
• Trigger via webhook or manual node. The input must include:

  {
    "voice": "nova",
    "ttsSpeed": 1,
    "videoLength": 60,
    "redditLink": "https://www.reddit.com/r/example/comments/example_id/example_title"
  }
  

How to customize this workflow

• Tweak OpenAI prompts to change tone or clip granularity
• Change stock source by swapping Pexels for another API
• Adjust TTS voices or languages by modifying the voice field
• Modify video styling (fonts, colors, fit modes) in the timeline construction code node
• Control duration by editing the character length formula in the Limit comments length node

Additional Notes

• All stock videos are selected to match clip themes using generalized keywords to avoid API misses
• Includes wait nodes to ensure Shotstack's async upload/render processes complete before proceeding
• Annotated with sticky notes explaining major sections like TTS, Reddit input, and media timeline
• Avoids community nodes to ensure cloud compatibility

Template Category

AI, Marketing, Building Blocks, Other (Content Creation)