Mastodon Post Preview

See your post as it appears on Mastodon, with links, hashtags, and an image, and check it against the default 500-character limit. Free, no signup, and it runs in your browser.

  • Mastodon preview updates as you type
  • See the “more” cut-off and over-limit warnings
  • Mobile and desktop widths, no upload to a server
Media
Schedule with PostlyBee

Layouts are simplified and approximate. Confirm the final result in the PostlyBee composer.

Post preview

Mastodon
251 / 500
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PostlyBee @postlybee · now

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From preview to published

Preview it here, publish to Mastodon with PostlyBee

The same editor you use for every post, in a few steps.

Paste or type the post, and see it update as Mastodon would show it. Hashtags and links are picked out as you type.

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Practical guide

Write for a feed that is not algorithmic

Mastodon shows posts in order, so readers see what you write when you write it. Use the preview to check that the opening lands and that hashtags sit where they help discovery.

Servers and apps render posts differently. The preview is a simplified planning card, so confirm the final result in the PostlyBee composer for the connected account.

Privacy: Your copy, account details, and any image you add stay in this browser tab. Nothing is uploaded to PostlyBee or an AI service.

  1. 01

    Paste the post

    Include links and hashtags exactly as you plan to publish them.

  2. 02

    Check the count

    Read the badge against 500, or against your server’s own limit.

  3. 03

    Add media

    Try an image to see how it sits under the text.

Pro tips

Pro tips for Mastodon posts

The limit depends on the server

Mastodon servers set their own limit, and 500 characters is the default. Check your server’s limit if it is different.

Links count as 23

Mastodon counts every link as 23 characters, however long it is. The preview applies the same rule.

Hashtags make posts findable

Mastodon has no algorithmic feed, so hashtags are how others find your post. Use a few relevant ones, with capital letters between words for readability.

Related tools

FAQ

About the Mastodon Post Preview

Know what the preview measures, what it does not guarantee, and how your input is handled.

Ready to move from preview to publishing?

Use this free tool without an account, then bring the finished work into PostlyBee to customize, schedule, and track the campaign.

Start scheduling with PostlyBee