Mastodon post scheduler
Schedule text posts, images and video (up to 4 attachments) to Mastodon
Draft once, pick your Mastodon channel next to any other network you post to, and set the time. Postauto holds the limit of 500 characters (default; instances can differ) against your draft, departs every channel at that minute, and tells you what Mastodon did with it.
The rules
The Mastodon rules Postauto works to
Taken from Mastodon's own developer documentation, not from a marketing page.
Count your draft against this limit, and against every other network at the same time. No account needed.
| Content types | Text posts, Images and video (up to 4 attachments) |
|---|---|
| Character limit | 500 characters (default; instances can differ) |
| Media rules | Up to 4 media attachments; video processing is polled until ready |
| Account requirement | Any account on any instance with a personal access token (Preferences > Development) |
| Availability | Live |
Network note
Open network: works with every instance, tokens do not expire.
Departure
What happens to a Mastodon post
-
In the composer
The 500 limit is checked before you schedule
Write once, tick your Mastodon account alongside anything else you post to, and the counter runs against 500 characters (default; instances can differ) while you type. Over the limit means you cannot schedule, not a failure tomorrow morning.
-
On the board
Departures, not a spreadsheet of rows
Scheduled posts line up by time. You see what leaves next, what already departed, and what needs a look, without opening anything.
-
After it leaves
A Mastodon result of its own
Every channel reports separately. A Mastodon rejection does not stop the other networks, and the network's own error text is shown on the board in plain language.
-
At rest
Credentials encrypted with AES-256-GCM
Your Mastodon credentials are encrypted before they reach the database, are never logged in plaintext, and are decrypted only at the moment of publishing.
Per-channel results
You can see what each network did
One post, one row per channel. Departed channels carry a link to the live post; a failed channel carries the network's own error text, so you know whether to fix the wording, the media, or the connection.
Send the same draft to
Tick these next to Mastodon in the composer and they all leave at the same time.
Mastodon scheduling questions
What can I publish to Mastodon with Postauto?
Text posts, Images and video (up to 4 attachments). Up to 4 media attachments; video processing is polled until ready.
What is the Mastodon character limit?
500 characters (default; instances can differ). The Postauto composer checks this limit against every account you select before the post is scheduled, so nothing fails at departure time over length.
What do I need to connect Mastodon?
Any account on any instance with a personal access token (Preferences > Development).
Is Mastodon scheduling available on Postauto right now?
Yes. Mastodon publishing is live for every Postauto account today.
Anything specific to Mastodon I should know?
Character limits are enforced per your instance's rules. No app review is needed on any instance.
Can I post to Mastodon and other networks at the same time?
Yes. One composer publishes to any mix of your connected channels, and each network's limits are checked per selected channel. Every channel departs at the same scheduled time.
What happens if a Mastodon post fails?
Each channel reports its own result. If Mastodon rejects a post, your other selected networks still publish, the post is marked partial, and the board shows a readable error for the failed channel.
Is there a free plan?
Yes. The free plan includes 1 channel · 15 posts a month, no card required.
Next departure
Put Mastodon on the board
Connect the account, write the post, set the time. The free plan covers 1 channel · 15 posts a month.