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How-to guide

How to cross-post to Bluesky and Mastodon

Write one post in the composer and pick both accounts. Bluesky allows 300 characters and Mastodon usually 500, so each has its own tab where you can shorten or extend the text, add alt text and set a poll on Mastodon. Preview both, then schedule them together or at different times.

Also:How-to guidesSchedule Bluesky postsSchedule Mastodon posts

Updated 2026-10-23

Steps

  1. 01

    Pick both accounts

    Choose your Bluesky and Mastodon accounts in Compose.

  2. 02

    Write the main text

    Type the post once. The counts for both appear under the box.

  3. 03

    Adjust each version

    Open each tab and shorten or edit the text where its limit is tighter. Add alt text to images.

  4. 04

    Use threads for length

    If the text is long, split it into a thread for either network.

  5. 05

    Preview and schedule

    Check both previews and pick a time; each network can also have its own time.

Good to know

  • Set your Mastodon instance's own limit on the connection if it allows more than 500.
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Free tools

Count characters the way each network does, split threads and preview posts. No account needed.

Open the tools
For builders

API and MCP

Post to every network from your own code or assistant with one key, signed webhooks and idempotent requests.

See the API

Questions

Do they count characters the same way?

No. Bluesky counts what a reader sees as one character; Mastodon counts code points and every link as 23.

Can I use a poll on both?

Polls are available on Mastodon, not together with media.

Sources

Bluesky specs and limits: text, media, daily capFree character counter for every social network1Post vs Typefully: price, networks, APISocial media posting limits by network, dated
How-to guides for scheduling social media postsSchedule Bluesky posts: formats, limits, setupSchedule Mastodon posts: formats, limits, setupCross-posting: definition for social media posting

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