Auto-Caption & Post Videos to Instagram & TikTok with Submagic, Postiz & OpenAI
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Automate With Marc
Description
🎥 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.
Upload to Postiz – Sends the file to Postiz for multi-platform posting.
Caption Agent (OpenAI) – Generates optimized Instagram/TikTok captions.
Post to Instagram/TikTok – Publishes the video with caption.
Update Log – Saves video details, captions, and status into Google Sheets.
Why You’ll Love It
⚡ Hands-off publishing — videos go from raw to posted automatically.
📝 AI captions + Submagic styling — engaging text and visual consistency.
📊 Content tracking — every post logged in Google Sheets.
🎯 Perfect for Reels & TikToks — optimized for fast workflows and social reach.
Requirements
Google Drive account
Submagic API key
Postiz account (for IG/TikTok posting)
OpenAI API key (for caption generation)
Google Sheets account