Cross-Platform Posting: One API Call to Publish Everywhere

The Problem: Managing 10+ Social Platforms is a Nightmare

If you manage a brand's social presence in 2026, you are probably dealing with an absurd number of platforms. Instagram, LinkedIn, X (Twitter), Threads, TikTok, Facebook, YouTube, Telegram, Mastodon, Bluesky, Pinterest — each with its own API, authentication flow, media requirements, character limits, and rate limits.

Publishing the same announcement across all of them means writing 11 different API integrations, handling 11 different OAuth flows, managing 11 different token refresh cycles, converting media to 11 different format requirements, and monitoring 11 different rate limit quotas. The engineering effort is enormous, the maintenance burden is worse, and the bugs are endless.

What you'll learn in this guide:

• How one API call publishes to all 11 platforms simultaneously
• Complete platform comparison table — character limits, media specs, content types
• How Publora handles format differences automatically (image conversion, thread splitting, facets)
• Platform-specific settings for fine-tuning per-platform behavior
• Code examples in JavaScript and Python for cross-platform posting

The Cost of Building It Yourself

Before looking at the solution, let's quantify what building cross-platform posting from scratch actually requires.

Each platform has unique quirks that take time to discover and handle:

Publora eliminates all of this by providing a single unified API that handles every platform's authentication, media conversion, character counting, and rate limiting behind the scenes.

One API Call to Publish Everywhere

Here is the core concept: you send one POST request with an array of platform IDs, and Publora publishes to all of them simultaneously. The same content, adapted to each platform's requirements automatically.

JavaScript

const response = await fetch('https://api.publora.com/api/v1/create-post', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'x-publora-key': 'sk_YOUR_API_KEY'
  },
  body: JSON.stringify({
    content: 'Excited to announce v3.0 of our developer toolkit! New features include real-time collaboration, AI-powered code review, and 50% faster builds. Try it now: https://example.com/v3 #devtools #opensource',
    platforms: [
      'instagram-17841400123456789',   // Instagram
      'linkedin-abc123def',             // LinkedIn
      'twitter-987654321',              // X (Twitter)
      'threads-112233445566',           // Threads
      'telegram-chat-100200300',        // Telegram
      'facebook-998877665544',          // Facebook
      'bluesky-did:plc:xyz789',         // Bluesky
      'mastodon-445566'                 // Mastodon
    ],
    scheduledTime: '2026-04-10T15:00:00Z'
  })
});

const data = await response.json();
console.log('Published to 8 platforms:', data.postGroupId);

Python

import requests

API_KEY = 'sk_YOUR_API_KEY'

response = requests.post(
    'https://api.publora.com/api/v1/create-post',
    headers={
        'Content-Type': 'application/json',
        'x-publora-key': API_KEY
    },
    json={
        'content': 'Excited to announce v3.0 of our developer toolkit! New features include real-time collaboration, AI-powered code review, and 50% faster builds. Try it now: https://example.com/v3 #devtools #opensource',
        'platforms': [
            'instagram-17841400123456789',
            'linkedin-abc123def',
            'twitter-987654321',
            'threads-112233445566',
            'telegram-chat-100200300',
            'facebook-998877665544',
            'bluesky-did:plc:xyz789',
            'mastodon-445566'
        ],
        'scheduledTime': '2026-04-10T15:00:00Z'
    }
)

data = response.json()
print(f'Published to 8 platforms: {data["postGroupId"]}')

That is it. One request. Eight platforms. All format differences, media conversions, and API quirks handled automatically by Publora.

The Complete Platform Comparison

Here is every platform Publora supports, with the key specifications you need to know for cross-platform content planning.

Platform	Character Limit	Images	Video	Text Only
Instagram	2,200	JPEG only, up to 10 (carousel)	MP4/MOV, up to 15 min (Reels)	No (media required)
LinkedIn	3,000	JPEG, PNG, multiple	MP4	Yes
X (Twitter)	280	Up to 4, auto-PNG (1000px max)	MP4, MOV	Yes
Threads	500	Up to 10 (carousel)	MP4, MOV, 1 per post	Yes
Telegram	4,096	Yes	Yes	Yes
Facebook	63,206 (API)	Multiple, WebP auto-converted	MP4, MOV, AVI, MKV, WebM	Yes
TikTok	2,200	No	MP4/MOV/WebM, 3s-10 min	No (video required)
YouTube	5,000 (description)	No	MP4/MOV/AVI/MKV/WebM	No (video required)
Mastodon	500	JPEG, PNG, GIF, WebP, up to 4	MP4, WebM, MOV	Yes
Bluesky	300	Up to 4 (all converted to JPEG)	MP4, max 3 min	Yes
Pinterest	500 (description)	JPEG, PNG	MP4	No (media required)

How Publora Handles Format Differences Automatically

The magic of cross-platform posting is in the automatic format adaptation. Here is what happens behind the scenes when you include multiple platforms in a single request.

Character Limit Handling

Media Format Conversion

You upload a single media file. Publora converts it to each platform's required format.

Platform	Image Conversion	Special Handling
Instagram	JPEG only (PNG rejected)	Aspect ratio 4:5 to 1.91:1
Twitter/X	Auto-converted to PNG, max 1000px	Up to 4 images
Bluesky	All formats converted to JPEG	~1 MB limit per image
Facebook	WebP auto-converted to JPEG	Multiple images become album
LinkedIn	JPEG, PNG (WebP auto-converted)	Multiple supported
Mastodon	JPEG, PNG, GIF, WebP native	Up to 4 per post

Rich Text Processing

Platform-Specific Settings

While the content text is shared across platforms, you can fine-tune per-platform behavior using the platformSettings object. This lets you control how each platform handles your post without creating separate API calls.

const response = await fetch('https://api.publora.com/api/v1/create-post', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'x-publora-key': 'sk_YOUR_API_KEY'
  },
  body: JSON.stringify({
    content: 'Behind the scenes of our latest product shoot!',
    platforms: [
      'instagram-17841400123456789',
      'tiktok-99887766',
      'youtube-UCxyz123',
      'telegram-chat-100200300'
    ],
    scheduledTime: '2026-04-15T12:00:00Z',
    platformSettings: {
      // Instagram: Post as Reel (not Story)
      instagram: {
        videoType: 'REELS'
      },
      // TikTok: Public with comments enabled
      tiktok: {
        viewerSetting: 'PUBLIC_TO_EVERYONE',
        allowComments: true,
        allowDuet: false,
        allowStitch: false,
        commercialContent: false,
        brandOrganic: false,
        brandedContent: false
      },
      // YouTube: Unlisted with custom title
      youtube: {
        privacy: 'unlisted',
        title: 'Behind the Scenes: Product Shoot 2026'
      },
      // Telegram: Enable link preview
      telegram: {
        disableWebPagePreview: false
      }
    }
  })
});

Available Platform Settings

Platform	Key Settings	Description
Instagram	videoType	"REELS", "STORIES", or omit for photo post
TikTok	viewerSetting, allowComments, allowDuet, allowStitch, commercialContent	Privacy, interactions, and commercial disclosure
YouTube	privacy, title	"public", "unlisted", or "private"; video title
Telegram	disableWebPagePreview	Control link preview generation

How Publora Handles Media Differences

The biggest pain point in cross-platform posting is media. Each platform has different format requirements, size limits, and content type restrictions. Here is how Publora resolves these conflicts automatically.

Cross-Platform Media Upload Example

import requests

API_KEY = 'sk_YOUR_API_KEY'
BASE = 'https://api.publora.com/api/v1'

# Step 1: Create multi-platform post
resp = requests.post(f'{BASE}/create-post', headers={
    'Content-Type': 'application/json',
    'x-publora-key': API_KEY
}, json={
    'content': 'New feature launch: real-time collaboration is here! #devtools',
    'platforms': [
        'instagram-17841400123456789',  # Will receive JPEG
        'twitter-987654321',             # Will receive PNG (max 1000px)
        'bluesky-did:plc:xyz789',        # Will receive JPEG (<1 MB)
        'linkedin-abc123def',            # Will receive original or JPEG
        'mastodon-445566',               # Will receive original format
        'facebook-998877665544',         # Will receive JPEG (if WebP input)
        'threads-112233445566'           # Will receive image as-is
    ],
    'scheduledTime': '2026-04-12T14:00:00Z'
})
post_id = resp.json()['postGroupId']

# Step 2: Upload one image — Publora handles per-platform conversion
upload_resp = requests.get(
    f'{BASE}/upload-media/{post_id}?filename=feature-hero.png',
    headers={'x-publora-key': API_KEY}
)
upload_url = upload_resp.json()['uploadUrl']

with open('feature-hero.png', 'rb') as f:
    requests.put(upload_url, headers={'Content-Type': 'image/png'}, data=f)

print(f'One upload, 7 platforms, zero format headaches.')

Real-World Workflow: Product Launch Across All Platforms

Here is a complete, production-ready example of a product launch posted to 8 platforms with platform-specific settings, media upload, and scheduling.

import fs from 'fs';

const API_KEY = 'sk_YOUR_API_KEY';
const BASE = 'https://api.publora.com/api/v1';
const headers = { 'Content-Type': 'application/json', 'x-publora-key': API_KEY };

// The announcement — kept under 280 chars for Twitter compatibility
const content = `We just launched v3.0! 🚀

Real-time collab, AI code review, 50% faster builds.

Try it free: https://example.com/v3

#devtools #opensource #launch`;

// Step 1: Create cross-platform post
const response = await fetch(`${BASE}/create-post`, {
  method: 'POST',
  headers,
  body: JSON.stringify({
    content,
    platforms: [
      'linkedin-abc123def',
      'twitter-987654321',
      'threads-112233445566',
      'mastodon-445566',
      'bluesky-did:plc:xyz789',
      'facebook-998877665544',
      'telegram-chat-100200300',
      'instagram-17841400123456789'
    ],
    scheduledTime: '2026-04-15T15:00:00Z',
    platformSettings: {
      tiktok: {
        viewerSetting: 'PUBLIC_TO_EVERYONE',
        allowComments: true
      },
      telegram: {
        disableWebPagePreview: false
      }
    }
  })
});

const { postGroupId } = await response.json();
console.log('Post created:', postGroupId);

// Step 2: Upload hero image
const uploadRes = await fetch(
  `${BASE}/upload-media/${postGroupId}?filename=v3-launch-hero.jpg`,
  { headers: { 'x-publora-key': API_KEY } }
);
const { uploadUrl } = await uploadRes.json();

await fetch(uploadUrl, {
  method: 'PUT',
  headers: { 'Content-Type': 'image/jpeg' },
  body: fs.readFileSync('v3-launch-hero.jpg')
});

console.log('Launch scheduled to 8 platforms at 2026-04-15 15:00 UTC');

Handling Failures Gracefully

In cross-platform posting, individual platforms can fail while others succeed. Publora processes each platform independently — a TikTok rate limit error does not prevent your LinkedIn post from going through.

import requests

API_KEY = 'sk_YOUR_API_KEY'
BASE = 'https://api.publora.com/api/v1'

# Check post status after publishing
resp = requests.get(
    f'{BASE}/list-posts?limit=5',
    headers={'x-publora-key': API_KEY}
)

for post in resp.json()['posts']:
    print(f"Post: {post['content'][:50]}...")
    for platform in post.get('platforms', []):
        status = platform.get('status', 'unknown')
        name = platform.get('platformId', 'unknown')
        print(f"  {name}: {status}")
        if status == 'failed':
            print(f"    Error: {platform.get('error', 'No details')}")

Content Strategy for Cross-Platform Posting

Not all content works equally well across all platforms. Here is a practical guide to which content types fit which platforms.

Pricing: One Post, Many Platforms

A common question about cross-platform posting: does posting to 8 platforms count as 8 posts against your quota?

Getting Started in 5 Minutes

Ready to publish everywhere with one API call? Here is the quickest path.

1. Create a Publora account — free trial available on the Pro plan
2. Connect your platforms — Go to Connections and add each social account (one-time setup per platform)
3. Get your API key — Settings → API Keys → Create Key (authentication docs)
4. List your platform IDs — Via List Connections API or the dashboard
5. Make your first cross-platform post — Use the code examples above with all your platform IDs

Frequently Asked Questions

Further Reading

• Create Post API Reference — Full endpoint documentation with all parameters
• List Connections API — Retrieve all connected platform IDs programmatically
• Media Upload Workflow — Presigned URL upload guide for all platforms
• Scheduling Guide — Timezone handling and batch scheduling
• Rate Limits Reference — Platform-by-platform rate limit comparison
• Instagram Platform Docs — Instagram-specific API documentation
• TikTok Platform Docs — TikTok-specific API documentation
• Bluesky Platform Docs — Bluesky/AT Protocol API documentation
• MCP Client Setup — Use cross-platform posting with AI assistants