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

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Important notice

This workflow is provided as-is. Please review and test before using in production.

1. Workflow Overview

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 en...

Best for

Multimodal AI automation workflows
advanced n8n builders looking for reusable templates

Tools used

n8n-nodes-base.googledrivetrigger, n8n-nodes-base.httprequest, n8n-nodes-base.googlesheets, @n8n/n8n-nodes-langchain.lmchatopenai, @n8n/n8n-nodes-langchain.agent, n8n-nodes-base.code, n8n-nodes-base.if, n8n-nodes-base.wait

Source and attribution

This workflow is cataloged by N8N Workflows and links back to its original n8n.io source page by Automate With Marc.

Original n8n.io source

1.1 Workflow description

Title: Auto-caption & post videos to Instagram & TikTok with Submagic, Postiz & OpenAI
Workflow name: 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.

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

1.2 Logical Blocks

This catalog entry is organized from the workflow JSON. The node-level section below shows the executable blocks available for review before importing the template.

2. Block-by-Block Analysis

Block 1 - Google Drive Trigger

Type / Role: n8n-nodes-base.googleDriveTrigger - googleDriveTrigger
Config choices: Version 1

Block 2 - Post to Submagic

Type / Role: n8n-nodes-base.httpRequest - httpRequest
Config choices: Version 4.2

Block 3 - Get Captioned Video from Submagic

Type / Role: n8n-nodes-base.httpRequest - httpRequest
Config choices: Version 4.2

Block 4 - Download Captioned Video

Type / Role: n8n-nodes-base.httpRequest - httpRequest
Config choices: Version 4.2

Block 5 - Upload to Postiz

Type / Role: n8n-nodes-base.httpRequest - httpRequest
Config choices: Version 4.2

Block 6 - Post to Instagram

Type / Role: n8n-nodes-base.httpRequest - httpRequest
Config choices: Version 4.2

Block 7 - Update Log

Type / Role: n8n-nodes-base.googleSheets - googleSheets
Config choices: Version 4.7

Block 8 - OpenAI Chat Model

Type / Role: @n8n/n8n-nodes-langchain.lmChatOpenAi - lmChatOpenAi
Config choices: Version 1.2

Block 9 - Caption Agent

Type / Role: @n8n/n8n-nodes-langchain.agent - agent
Config choices: Version 2.2

Block 10 - Code

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 11 - Get row(s) in sheet

Type / Role: n8n-nodes-base.googleSheets - googleSheets
Config choices: Version 4.7

Block 12 - If

Type / Role: n8n-nodes-base.if - if
Config choices: Version 2.2

Block 13 - Wait 15 Secs

Type / Role: n8n-nodes-base.wait - wait
Config choices: Version 1.1

Block 14 - Wait 15 Secs1

Type / Role: n8n-nodes-base.wait - wait
Config choices: Version 1.1

Block 15 - Sticky Note

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 16 - Sticky Note1

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 17 - Sticky Note2

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 18 - Sticky Note3

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 19 - Sticky Note4

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 20 - Sticky Note5

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 21 - Sticky Note6

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

3. Summary Table

Workflow	Auto-caption & post videos to Instagram & TikTok with Submagic, Postiz & OpenAI
Complexity	advanced
Nodes	21
Categories	Multimodal AI
Author	Automate With Marc
Published	28 Aug 2025

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/7992/7992.json as the source template for this automation.
2. Import the template into n8n

Open n8n, import the downloaded JSON, and review each node before activating the workflow.
3. Configure credentials and variables

Replace placeholder credentials, API keys, webhook URLs, account IDs, and environment-specific values with your own settings.
4. Test with sample data

Run the workflow manually or in a staging workspace, inspect node output, and confirm downstream systems receive the expected data.
5. Activate and monitor

Enable the workflow only after testing, then monitor executions, errors, and rate limits during the first production runs.

5. General Notes & Resources

Review imported nodes carefully before activation. This catalog entry is intended to help you inspect the workflow structure, understand required services, and find related templates faster.

Node names, credentials, schedules, webhook paths, and external service limits may need adjustment for your workspace.

Download workflow JSON Original n8n.io source Multimodal AI workflows

Frequently asked questions

What does Auto-caption & post videos to Instagram & TikTok with Submagic, Postiz & OpenAI do?

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 en...

What do I need before importing this workflow?

Review the workflow JSON, configure any required credentials in n8n, and test the automation in a safe workspace before using it in production.

Can I customize this workflow?

Yes. Use the block-by-block analysis and the downloadable JSON to inspect each node, then adjust credentials, prompts, schedules, filters, or destinations for your Multimodal AI use case.

Automate With Marc

50 workflows

Nodes

n8n-nodes-base.googledrivetrigger n8n-nodes-base.httprequest n8n-nodes-base.googlesheets @n8n/n8n-nodes-langchain.lmchatopenai @n8n/n8n-nodes-langchain.agent n8n-nodes-base.code n8n-nodes-base.if n8n-nodes-base.wait

Complexity

advanced

Published 28 Aug 2025

Likes 0

View on n8n.io Download Workflow

Install path: /data/workflows/7992/7992.json

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

Workflow preview

Important notice

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

🎥 Auto-Caption & Autopost Videos to Instagram & TikTok

Description

How It Works

Why You’ll Love It

Requirements

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - Google Drive Trigger

Block 2 - Post to Submagic

Block 3 - Get Captioned Video from Submagic

Block 4 - Download Captioned Video

Block 5 - Upload to Postiz

Block 6 - Post to Instagram

Block 7 - Update Log

Block 8 - OpenAI Chat Model

Block 9 - Caption Agent

Block 10 - Code

Block 11 - Get row(s) in sheet

Block 12 - If

Block 13 - Wait 15 Secs

Block 14 - Wait 15 Secs1

Block 15 - Sticky Note

Block 16 - Sticky Note1

Block 17 - Sticky Note2

Block 18 - Sticky Note3

Block 19 - Sticky Note4

Block 20 - Sticky Note5

Block 21 - Sticky Note6

3. Summary Table

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

2. Import the template into n8n

3. Configure credentials and variables

4. Test with sample data

5. Activate and monitor

5. General Notes & Resources

Frequently asked questions