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PostQueen will post public Mastodon posts and threads with images, video and alt text, and wait for your server to finish processing a video before it posts.
A new Mastodon post in the PostQueen composer, with the post types Mastodon takes and the time it goes out

What you can post

Text

Up to 500 characters, even on a server that allows more.

Media

Images and MP4 video, with alt text. How many a post can carry is your server’s rule, usually 4 images or 1 video.

Post types

Post and thread. Every post is public.

Analytics

No analytics for Mastodon.
Not supported: unlisted, followers-only and direct posts, content warnings, polls and quote posts.

Connect Mastodon

Mastodon is listed in Add Channel, but it cannot be connected on PostQueen yet. It will connect accounts on one Mastodon server: accounts on other servers cannot be connected.

Post settings

Mastodon posts have no settings of their own in the composer: the text, the media and each file’s alt text are all a post carries. The API fields are on Mastodon posting settings.

Good to know

  • Continue thread adds parts to the post. Each part is posted as a reply to the part before, can carry its own media and has its own delay.
  • PostQueen waits until your server has processed a video before it creates the post. Media in later thread parts is posted without that wait, so a part with a large video can fail.
  • The number of files per post is not checked first: your server refuses a post that carries more than it allows.
  • The first post carries a key that stops Mastodon from publishing it twice when the request is retried.

Next steps

Create a post

Write once for several channels, then schedule it, save a draft or post now.

Channels and their status

Which networks you can connect today, what each one posts, and its text limit.

Post from an AI agent

Ask Claude, ChatGPT, Grok Bot or another agent to schedule the post for you.

A post did not go out

Why a post fails and what to do about it.
Last modified on September 23, 2026