Auto-caption your posts with n8n + Caption-Pack (5 minutes, free)

Description and use

Using an 8‑node n8n workflow and a free Caption‑Pack API, you can generate a multi‑platform content plan with captions and hashtags for X, LinkedIn, and Instagram in five minutes, saving time and cost.

Problem

Creating platform‑specific captions for a single piece of content is time‑consuming and requires manual copy‑pasting.

Outcome

Within five minutes, users can generate multi‑platform caption plans for free, saving time and avoiding LLM costs.

Workflow

• Get a free API key from https://caption-pack-api.onrender.com/v1/free-trial
• Import the caption‑pack‑n8n‑template.json workflow into n8n
• Create a Header Auth credential named Authorization with value "Bearer <key>"
• Assign the credential to the Call Caption‑Pack API and Check Balance nodes
• Run the workflow: fill the form with source content, audience, platforms, tone, and submit
• View the completion page showing per‑platform captions, hashtags, posting order, and remaining credits

Evidence

Last week I launched a small API that turns a topic, audience, and tone into ready‑to‑post social captions — no LLM in the loop, just a deterministic template‑and‑variant engine.

Source

Open this in your browser: https://caption-pack-api.onrender.com/v1/free-trial

Source

Grab the template JSON from the repo: https://github.com/jeshuadomingo-byte/caption-pack-n8n-template

Source

Click Test workflow, fill in the form ... and submit. Your multi‑platform content plan lands on the completion page

Source