Zway.ai
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Split a draft into a thread that reads

This splits long text into a numbered thread, packing whole sentences into each post so nothing breaks mid-sentence. The character limit and numbering style are both editable, and a sentence longer than the limit on its own is split at word boundaries with a note telling you where it happened.

Last reviewed 27 August 2026

280 is the standard limit on X. Other surfaces and account types differ, which is why this is a field rather than a constant.

For a link or a call to action you will add yourself after pasting.

Result

Posts in the thread

3

101 words split on sentence boundaries

Longest post

264 of 280 characters

Every post fits, numbering included

Your thread

1/3 Most founders publish content and then wonder why nobody read it. The publishing step takes minutes. The distribution step takes hours, and it is the one that decides whether the piece does anything at all. Here is the version that works. Write the piece once.

2/3 Pull the three strongest paragraphs out of it. Turn each one into a post on the channel where your audience already is. Answer every reply for the first two days.

3/3 That is four hours of work per piece, and it is the difference between a piece that gets read and an identical piece that does not.

Character count per post

Character count per post
PostCharactersStatus
1264 / 280Fits
2166 / 280Fits
3135 / 280Fits

Every post breaks between sentences, so each one reads as a complete unit. Before posting, read post one on its own. If it does not work without the rest of the thread, move your strongest line to the front.

How this works

What the numbers mean.

  • 01Text is split into sentences first, then sentences are packed into posts until the next one would not fit. Nothing is cut mid-sentence unless a single sentence is longer than the whole limit.
  • 02The numbering marker is counted against the limit before packing. A thread that fits at 280 characters stops fitting the moment you add 12/17 to the front of every post, which is the failure most splitters produce.
  • 03The post count changes the width of the marker, which changes the budget, which can change the post count. The packing runs again until the two agree.
  • 04A sentence longer than the limit is cut at the last space that fits, and the number of hard cuts is reported so you can go back and shorten that sentence instead of accepting the break.

Assumptions and limits

  • This is a plain character count. X measures some characters differently and shortens links to a fixed length, so a post containing a link will measure differently on the platform than it does here.
  • Nothing is posted anywhere. This produces text you paste yourself.
  • Sentence detection splits on periods, question marks, and exclamation marks, so abbreviations will split early and produce a shorter post than expected.
  • The reserved characters are applied to the final post only, and the reservation is approximate when the post count shifts during packing.

Questions about this tool

Why 280 characters?
It is the standard post limit on X for plain text. Limits differ by platform and by account type, and other surfaces use entirely different numbers, which is why the limit is an editable field here rather than a constant. Set it to whatever the surface you are posting to actually allows.
Should the numbering go at the start or the end?
At the start, the number is the first thing a reader sees, which costs you the opening words of every post but makes the thread obvious. At the end, each post reads as a standalone statement, which matters more when individual posts get shared without the thread around them. Both are defensible.
How long should a thread be?
Short enough that the last post is still about the thing the first post promised. The structural constraint is that every post after the first is read by fewer people than the one before it, so anything essential belongs early. If your argument needs fifteen posts, it probably needs a page instead.
What happens to a sentence longer than the limit?
It is cut at the last space that fits and continued in the next post, and the number of times that happened is reported. Treat every one as a note to yourself. A sentence that will not fit in a post is nearly always a sentence carrying two ideas that would read better separated.

Related

This tool is free and there is nothing to sign up for. If you would rather have the work done than calculate it, that is what Zway does.

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