Postiz Social Media Scheduler

---

name: postiz

description: |

Schedule and manage social media posts via Postiz API (self-hosted or cloud).

Direct API integration — no n8n dependency.

Supports X/Twitter, LinkedIn, Bluesky with platform-specific character limits.

Includes deduplication, scheduling, media upload, and thread creation.

WHAT IT CAN DO:

- Schedule posts to 28+ channels (X, LinkedIn, Bluesky, Reddit, Instagram, Facebook, Threads, YouTube, TikTok, Pinterest, Mastodon, and more)

- Multi-platform posting in a single API call with platform-adapted content

- X/Twitter thread creation for longer content

- Media upload (file and URL)

- Find next available posting slot per channel

- List, query, update, and delete scheduled posts

- Deduplication workflow (check existing before posting)

- Platform-specific character limits and content tone guidance

- Post state management (QUEUE, PUBLISHED, ERROR, DRAFT)

- Helper script for quick posting with auto-validation

USE WHEN: scheduling social media posts, creating multi-platform content, managing a posting calendar, uploading media for social posts, checking post status, creating X/Twitter threads, or automating social media workflows.

---

# Postiz Social Media Scheduler

Direct API integration for social media posting. No n8n workflows needed.

Setup

Required Environment Variables

# Core configuration
export POSTIZ_URL="https://your-postiz-instance.com"
export POSTIZ_EMAIL="your@email.com"
export POSTIZ_PASSWORD="your-password"

# Integration IDs (get from Postiz dashboard → Integrations)
export POSTIZ_X_ID="your-x-integration-id"
export POSTIZ_LINKEDIN_ID="your-linkedin-integration-id"
export POSTIZ_BLUESKY_ID="your-bluesky-integration-id"

To find your integration IDs:

1. Go to your Postiz dashboard

2. Navigate to **Integrations** or **Channels**

3. Each connected account shows an ID (or use the API: `GET /api/integrations/list`)

Platform Limits

| Platform | Character Limit | Notes |

|----------|-----------------|-------|

| X/Twitter | **280** | Links count as 23 chars (t.co shortening) |

| LinkedIn | **3,000** | First 140 chars show in preview |

| Bluesky | **300** | Growing tech/developer audience |

Platform Content Guidelines

X/Twitter (280 chars)

LinkedIn (3,000 chars)

Bluesky (300 chars)

Authentication

# Login and save cookie (required before any API call)
curl -s -c /tmp/postiz-cookies.txt \
  "$POSTIZ_URL/api/auth/login" \
  -H 'Content-Type: application/json' \
  -d "{\"email\":\"$POSTIZ_EMAIL\",\"password\":\"$POSTIZ_PASSWORD\",\"provider\":\"LOCAL\"}"

Cookie expires periodically. Re-run login if you get 401 errors.

Find Next Available Slot

curl -s -b /tmp/postiz-cookies.txt \
  "$POSTIZ_URL/api/posts/find-slot/$POSTIZ_X_ID"

Returns the next open time slot for a given channel. Useful for auto-scheduling without conflicts.

Upload Media from URL

curl -s -b /tmp/postiz-cookies.txt \
  "$POSTIZ_URL/api/media/upload-from-url" \
  -H 'Content-Type: application/json' \
  -d '{"url": "https://example.com/image.png"}'

Creating Posts

Schedule a Post (Single Platform)

curl -s -b /tmp/postiz-cookies.txt \
  "$POSTIZ_URL/api/posts" \
  -H 'Content-Type: application/json' \
  -d "{
    \"type\": \"schedule\",
    \"date\": \"2026-02-05T15:00:00Z\",
    \"posts\": [{
      \"integration\": {\"id\": \"$POSTIZ_X_ID\"},
      \"value\": [{\"content\": \"Your tweet here (max 280 chars)\", \"image\": []}],
      \"settings\": {\"__type\": \"x\"}
    }]
  }"

Multi-Platform Post (Adapted Content)

curl -s -b /tmp/postiz-cookies.txt \
  "$POSTIZ_URL/api/posts" \
  -H 'Content-Type: application/json' \
  -d "{
    \"type\": \"schedule\",
    \"date\": \"2026-02-05T15:00:00Z\",
    \"posts\": [
      {
        \"integration\": {\"id\": \"$POSTIZ_X_ID\"},
        \"value\": [{\"content\": \"Short X version (280 chars max)\", \"image\": []}],
        \"settings\": {\"__type\": \"x\"}
      },
      {
        \"integration\": {\"id\": \"$POSTIZ_LINKEDIN_ID\"},
        \"value\": [{\"content\": \"Longer LinkedIn version with more context and professional tone. Can be up to 3000 characters.\", \"image\": []}],
        \"settings\": {\"__type\": \"linkedin\"}
      },
      {
        \"integration\": {\"id\": \"$POSTIZ_BLUESKY_ID\"},
        \"value\": [{\"content\": \"Bluesky version (300 chars max)\", \"image\": []}],
        \"settings\": {\"__type\": \"bluesky\"}
      }
    ]
  }"

Post Types

Listing & Querying Posts

Get Posts by Date Range (Required!)

curl -s -b /tmp/postiz-cookies.txt \
  "$POSTIZ_URL/api/posts?startDate=2026-02-01T00:00:00Z&endDate=2026-02-08T00:00:00Z" \
  | jq '.posts[] | {id, state, publishDate, platform: .integration.providerIdentifier, content: .content[0:60]}'

Check for Duplicates Before Posting

# Get recent posts and check content similarity
curl -s -b /tmp/postiz-cookies.txt \
  "$POSTIZ_URL/api/posts?startDate=2026-02-01T00:00:00Z&endDate=2026-02-08T00:00:00Z" \
  | jq -r '.posts[] | "\(.integration.providerIdentifier): \(.content[0:80])"'

Post States

| State | Description |

|-------|-------------|

| `QUEUE` | Scheduled, waiting to publish |

| `PUBLISHED` | Successfully posted |

| `ERROR` | Failed to publish |

| `DRAFT` | Saved but not scheduled |

Media Upload

Upload Image

# Upload returns {id, path}
curl -s -b /tmp/postiz-cookies.txt \
  "$POSTIZ_URL/api/media/upload-simple" \
  -F 'file=@/path/to/image.png'

Use in Post

"value": [{
  "content": "Post with image",
  "image": [{"id": "MEDIA_ID", "path": "/uploads/..."}]
}]

Twitter/X Threads

For longer content on X, create a thread:

"value": [
  {"content": "Tweet 1/3: Introduction to the topic...", "image": []},
  {"content": "Tweet 2/3: The main point explained...", "image": []},
  {"content": "Tweet 3/3: Conclusion and call to action.", "image": []}
]

Managing Posts

Delete Post

curl -s -b /tmp/postiz-cookies.txt -X DELETE \
  "$POSTIZ_URL/api/posts/POST_ID"

Update Schedule

curl -s -b /tmp/postiz-cookies.txt -X PUT \
  "$POSTIZ_URL/api/posts/POST_ID/date" \
  -H 'Content-Type: application/json' \
  -d '{"date": "2026-02-06T10:00:00Z"}'

Best Practices

Avoid Duplicates

1. Always query existing posts before creating new ones

2. Use unique identifiers in content (dates, specific references)

3. Check both QUEUE and PUBLISHED states

Scheduling

Content Adaptation

Don't just truncate! Rewrite for each platform:

Helper Scripts

Post to Multiple Platforms

# Single platform
uv run scripts/post.py \
  --platform x \
  --content "Your tweet here" \
  --schedule "2026-02-05T15:00:00Z"

# Multi-platform with different content
uv run scripts/post.py \
  --x "Short X version" \
  --linkedin "Longer LinkedIn version with more detail" \
  --bluesky "Bluesky version" \
  --schedule "2026-02-05T15:00:00Z"

# Post immediately
uv run scripts/post.py \
  --platform x \
  --content "Posting now!" \
  --now

# Validate without posting
uv run scripts/post.py \
  --x "Test content" \
  --validate

Check for Duplicates

# Check last 30 days
uv run scripts/check_duplicates.py

# Check last 7 days
uv run scripts/check_duplicates.py --days 7

# Check if specific content would be duplicate
uv run scripts/check_duplicates.py --content "Your proposed post content"

Troubleshooting

401 Unauthorized

Re-run the login curl command to refresh cookie.

Post Not Publishing

1. Check state is `QUEUE` not `DRAFT`

2. Verify date is in the future

3. Check integration is still connected in UI

Duplicate Posts

Always check existing posts before creating. The API doesn't deduplicate automatically.

Missing Environment Variables

Scripts will tell you which env vars are missing. Set them in your shell or `.env` file:

export POSTIZ_URL="https://your-postiz.example.com"
export POSTIZ_EMAIL="your@email.com"
export POSTIZ_PASSWORD="your-password"
export POSTIZ_X_ID="your-integration-id"