Auto-caption & post videos to Instagram & TikTok with Submagic, Postiz & OpenAI

🎥 Auto-Caption & Autopost Videos to Instagram & TikTok

Description Automate your short-form content pipeline! This workflow takes any video uploaded to a specific Google Drive folder, generates engaging captions with Submagic, and then auto-posts the finished video (with AI-generated captions) directly to Instagram or TikTok via Postiz. Captions are further refined with OpenAI for brand-ready social text. Finally, each published video is logged into a Google Sheet for tracking.

👉 Watch step-by-step build of this workflow on: www.youtube.com/@automatewithmarc

How It Works

Google Drive Trigger – Detects new video uploads.

Submagic API – Adds styled captions automatically.

Wait + Poll – Monitors job status until the captioned video is ready.

Download Video – Retrieves the finished captioned video.