n8n Workflow: Native Social Video Posts with PostWire

Native social video posting made easy with PostWire in n8n

This n8n workflow takes one public MP4 video URL and a post idea, generates platform-native captions with PostWire, and then publishes the video to your connected TikTok, Instagram, and YouTube accounts—using per-platform caption drafts and a default TikTok privacy of SELF_ONLY.

What this workflow does

Designed for repeatable social publishing, the workflow follows these steps:

• Runs when you manually click “Test workflow” in n8n.
• Sets inputs such as post idea, video_url (must be publicly reachable MP4), platforms (TikTok/Instagram/YouTube), and brand voice.
• Calls the PostWire API /api/generate to create a native caption draft for each selected platform.
• Calls the PostWire API /api/post to publish the video and the corresponding per-platform captions to every connected account.
• Applies TikTok privacy as SELF_ONLY by default.

Use cases

• Repurpose a single product or creator video across TikTok, Instagram, and YouTube with native caption wording for each platform.
• Automate consistent brand messaging by updating the idea and brand voice in the workflow before publishing.
• Turn manual “post this video” steps into a repeatable n8n automation for SaaS and marketing teams.

Technical details

• Triggers/Nodes: Manual Trigger, Set, Sticky Note, HTTP Request.
• Integrations: PostWire API via HTTP Request using an HTTP Header Auth credential.
• Authentication: `Authorization: Bearer <your_postwire_key>` (set on both HTTP Request steps).
• Endpoints used: /api/generate (caption drafts) and /api/post (publishing).

Requirements: A PostWire account with your TikTok/Instagram/YouTube connected via OAuth. The free tier (1 brand, 30 posts/month, no card) is sufficient to run this workflow.

Customization tip: Replace the manual trigger with a Schedule, RSS, or Google Sheets trigger for unattended publishing, and adjust the platforms array to target the networks you want.