Posting rules by platform
Every supported platform, what it can carry, and how you connect it
Postaryx supports 34 platforms. They disagree about almost everything: how many images a post can carry, whether a thread is a thread or a comment, whether text alone is allowed. This page is the reference for all of it.
Every platform
How you connect it is what happens when you click the platform in Add Channel:
- OAuth: you are redirected to the platform and authorise there.
- Credentials in Postaryx: you paste your own API key or app password into a dialog. Nothing to register anywhere.
- In-app dialog: a platform-specific connect step inside Postaryx.
- Browser extension: the Postaryx extension reads your existing session.
| Platform | How you connect it | Characters |
|---|---|---|
| X | OAuth | varies |
| OAuth | 3,000 | |
| LinkedIn Page | OAuth | 3,000 |
| OAuth | 10,000 | |
| Instagram (Facebook Business) | OAuth | 2,200 |
| Instagram (Standalone) | OAuth | 2,200 |
| Facebook Page | OAuth | 63,206 |
| Threads | OAuth | 500 |
| YouTube | OAuth | 5,000 |
| Google My Business | OAuth | 1,500 |
| TikTok | OAuth | 2,000 |
| OAuth | 500 | |
| Dribbble | OAuth | 40,000 |
| Discord | OAuth | 1,980 |
| Slack | OAuth | 400,000 |
| Kick | OAuth | 500 |
| Twitch | OAuth | 500 |
| Mastodon | OAuth | 500 |
| Bluesky | Credentials in Postaryx | 300 |
| Lemmy | Credentials in Postaryx | 10,000 |
| Farcaster | In-app dialog | 800 |
| Telegram | In-app dialog | 4,096 |
| Nostr | Credentials in Postaryx | 100,000 |
| VK | OAuth | 2,048 |
| Medium | Credentials in Postaryx | 100,000 |
| Dev.to | Credentials in Postaryx | 100,000 |
| Hashnode | Credentials in Postaryx | 10,000 |
| WordPress | Credentials in Postaryx | 100,000 |
| ListMonk | Credentials in Postaryx | 300,000 |
| Moltbook | In-app dialog | 300 |
| Whop | OAuth | 50,000 |
| Skool | Browser extension | 50,000 |
| MeWe | OAuth | 63,206 |
| Tumblr | OAuth | 32,768 |
X is the exception in that table. Its limit depends on the post: 280 characters normally, 4,000 if the account is verified, and 100,000 in long-form article mode.
Media rules
The composer blocks a post that breaks these before it ever reaches the platform.
| Platform | Media rules |
|---|---|
| X | Up to 4 images or 1 video. Text-only is fine. In article mode, images only, and a draft article cannot have thread replies |
| LinkedIn, LinkedIn Page | One attachment if it is a video. A carousel needs at least 2 images and no video. Comments can only contain text |
| Bluesky | Up to 4 images or 1 video. Text-only is fine |
| Instagram, Instagram Standalone | At least one attachment is required. A story takes a single picture. A trial reel is exactly one video |
| Facebook Page | Text-only, photos, or a video. A story needs at least one attachment, and each attachment publishes as its own story |
| YouTube | Exactly one attachment, and it must be a video |
| TikTok | At least one attachment. One video or several pictures, never mixed |
| At least one media, maximum 5 images. A video pin needs two attachments: the video and a cover image | |
| Dribbble | Exactly one attachment, images only |
| Google My Business | Text-only or exactly one image. No video |
| Farcaster | Images only |
| A media-type subreddit post needs exactly one attachment. Video posts need a thumbnail | |
| Tumblr | Up to 30 images, up to 1 video |
| Everything else | No specific restriction enforced by Postaryx |
Threads and comments
Postaryx lets you add extra parts to a post. What those parts become depends on the platform: a genuine thread, a comment on your own post, or nothing.
| Support | Platforms |
|---|---|
| Threads and comments | Most platforms |
| Comments cannot carry media | Instagram, Kick, Twitch |
| No extra parts at all | YouTube, TikTok, Pinterest, MeWe, Tumblr |
| Comments are text-only | LinkedIn, LinkedIn Page |
See Threads and comments for how to add them and set delays between parts.
Editors
The composer changes what it offers per platform, because platforms accept different content.
| Editor | What you get | Platforms |
|---|---|---|
| Plain | No formatting | Platforms that render text as-is |
| Standard | Bold, underline, emoji | Most social platforms |
| Markdown | Adds links, lists and headings | Discord, Medium, Dev.to, Hashnode, Whop |
| HTML | Rich formatting | X, WordPress, Listmonk |
Platform details
Most platforms behave the way you would expect. These are the ones with rules that catch people out.
Analytics support
Only 10 platforms report account-level analytics back to Postaryx. See Analytics for the metric list and date ranges.
Platforms with no connect button
These platforms are supported but have no in-app connect flow yet: Twitch, Kick, VK, Nostr, Lemmy, Medium, Dev.to, Hashnode, WordPress, Listmonk and Moltbook.