Auto-thread on overflow
How Unison splits long drafts into a clean native thread on X, Threads, Bluesky and Mastodon.
Some networks limit posts to a few hundred characters. Auto-thread takes a draft that goes over the limit and turns it into a clean, native thread without you having to count characters or insert numbering.
Auto-thread runs on:
- X (280 characters per post)
- Threads (500 characters per post)
- Bluesky (300 characters per post)
- Mastodon (instance-dependent, typically 500 characters per toot)
Other networks (LinkedIn, Facebook, Instagram captions, Telegram, Pinterest, YouTube) have higher limits and do not need to thread, so auto-thread does not run there.
How it splits
Auto-thread breaks at the nearest sentence boundary, then word boundary,
then character boundary, in that order. It avoids splitting URLs and
mentions across two posts. Numbering (1/, 2/, 3/) is added at the
end of each segment by default, but you can disable it from
Settings → Composer.
Editing each segment
Once the draft is split, every segment is editable. Switch to the auto-thread preview tab in the composer and click any segment to tweak it before publishing. Edits there only affect that segment for that channel.
Disabling auto-thread per draft
Open the draft, switch to the channel where you want to opt out, and toggle Auto-thread off in the meta strip. The post will fail to publish if it exceeds the channel limit, so you usually only do this when you have written a long draft on purpose for a network that handles it.
Tips
- The cleanest threads have one idea per segment. Write the body, then glance at the auto-split to see if any segment cuts off mid-thought; if it does, rephrase the original sentence.
- Auto-thread numbers can be replaced with custom prefixes (eg
Hot take 1·) under Settings → Composer → Thread numbering.
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