Postiz self-hosted: Social media scheduling with AI

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What this article covers

• What Postiz is: Open-source social media manager (Buffer/Hootsuite alternative).
• Docker setup and channel integration.
• Scheduling posts, managing channels, analytics.
• AI content generation with Ollama: draft posts automatically.
• Automation workflows with n8n.

Introduction

Postiz is the most modern open-source alternative to Buffer and Hootsuite: a social media scheduler that plans and publishes posts to X, LinkedIn, Instagram, Facebook, TikTok, YouTube, Mastodon, Reddit, Discord, Slack, Telegram, and more from a single interface.

For AI self-hosters, Postiz offers an API and webhook support. Combining it with Ollama creates a workflow that automatically transforms content ideas into finished posts for all your channels.

Common use cases

• Multi-channel posting: One post sent automatically across all channels (X, LinkedIn, Mastodon, Discord).
• AI content pipeline: Ollama generates posts from blog articles, then Postiz schedules them.
• Team workflows: Manage drafts, approvals, and scheduled posts across your team.
• Evergreen recycling: Automatically reschedule old posts.
• Blog to social: New article triggers n8n, which posts teasers to all channels via Postiz.

Installation: Docker

services:
  postiz:
    image: ghcr.io/gitroomhq/postiz-app:latest
    ports: ["127.0.0.1:4200:5000"]
    environment:
      - DATABASE_URL=postgresql://postiz:geheim@db:5432/postiz
      - REDIS_URL=redis://redis:6379
      - JWT_SECRET=langer-zufaelliger-key
      - MAIN_URL=https://social.deine-domain.de
      - FRONTEND_URL=https://social.deine-domain.de
      - NEXT_PUBLIC_BACKEND_URL=https://social.deine-domain.de/api
      - OPENAI_API_KEY=ollama            # Trick: Ollama ist API-kompatibel
      - OPENAI_BASE_URL=http://ollama:11434/v1
      - BACKEND_INTERNAL_URL=http://postiz:5000
    volumes: [postiz_data:/app/uploads]
    depends_on: [db, redis]
    restart: always

  db:
    image: postgres:16
    environment:
      POSTGRES_USER: postiz
      POSTGRES_PASSWORD: geheim
      POSTGRES_DB: postiz
    volumes: [pg_data:/var/lib/postgresql/data]
    restart: always

  redis:
    image: redis:7
    volumes: [redis_data:/data]
    restart: always

volumes:
  postiz_data:
  pg_data:
  redis_data:

Here’s the trick: Postiz has built-in OpenAI integration for AI posts. By pointing OPENAI_BASE_URL at Ollama, your AI runs entirely locally.

Linking channels

In the UI, go to Channels → Add Channel and enter OAuth tokens or app credentials for each platform. A few notes:

• X/Twitter: Requires a developer account and app keys. Free API tier is sufficient for posting.
• LinkedIn: Create a LinkedIn app and generate OAuth tokens.
• Mastodon: The easiest integration. Just provide the instance URL and access token.
• Discord/Telegram: Use bot tokens. Postiz posts as a bot to your servers and channels.
• Instagram/TikTok: Require business accounts and app review. More involved setup.

AI content generation

Postiz includes AI features built-in (when OPENAI_BASE_URL points to Ollama):

• Post generator: Enter a topic and the AI suggests post variations.
• Enhancement: Refine raw text with AI polish.
• Hashtags: AI recommends relevant tags.
• Channel adaptation: One post adapted by AI for each channel’s tone (formal for LinkedIn, punchy for X).

n8n workflow: Blog to social

RSS trigger: new blog article
    │
    ▼
Ollama: generate summary + 3 post variations
    │
    ▼
Postiz API: create posts for X, LinkedIn, Mastodon, Discord
    │
    ▼
Scheduled: Postiz publishes at optimal time

import requests

POSTIZ = "https://social.deine-domain.de"
HEADERS = {"Authorization": "Bearer DEIN_API_KEY"}

# Create and schedule post
requests.post(f"{POSTIZ}/api/posts", headers=HEADERS, json={
    "type": "schedule",
    "date": "2026-09-25T10:00:00Z",
    "posts": [{
        "integration": {"id": "X_CHANNEL_ID"},
        "value": [{"content": "New article: Local AI bots for Telegram...",
                   "image": []}]
    }]
})

Security

• API keys: Social media credentials stored in Postiz are sensitive. Use HTTPS and restrict access.
• OAuth tokens: Stored in the Postiz database. Back up your database and protect access.
• Not public: Your Postiz instance should be private for you and your team, not open for public registration.

Postiz vs. alternatives

Further reading

• IRC-Coding.de: Programming tutorials covering APIs and content pipelines.
• n8n: Automation for content workflows.
• Telegram bots: Telegram channels.
• Discord integration: Discord as a channel.
• Docker: Deployment.

Key takeaways:

• Postiz is open-source Buffer: one post goes to all channels, scheduled and automated.
• Built-in AI features work with Ollama (OpenAI-compatible API).
• API plus webhooks enable content pipelines: blog to AI-generated post to auto-scheduling.
• Meta channels (Instagram/Facebook) require business accounts and app review.
• The self-hosted social media solution for content creators and small teams.

FAQ

Sources and further reading

• Postiz: GitHub.
• Postiz Docs: Documentation.
• IRC-Coding.de: Programming tutorials.

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