The X thread splitter
You wrote 900 characters and X gives you 280. Splitting by eye either cuts a sentence in half or leaves two posts that each waste a third of their room. Paste the draft below and the splitter breaks it at sentence and word boundaries into numbered posts that each fit the documented limit — keeping the numbering inside the budget, reporting every part's length, and telling you what the thread costs against the daily post allowance. Nothing is uploaded.
Paste a draft to split it.
What the splitter does, and what it refuses to do
X's how to post instructions specify composing a message of up to 280 characters, and the thread documentation describes a thread as “a series of connected posts from one person” — each entry still bound by that same limit. This tool only handles the mechanical half of that job:
| Rule | Why it matters when you paste a draft |
|---|---|
| Every part fits the budget | The character count includes the numbering prefix, so a “12/13 ” label cannot push a part over the limit you chose |
| Sentences stay whole where possible | Splitting lands at sentence ends first, then at word boundaries — never mid-word, so nothing arrives broken |
| Nothing is dropped or reordered | Joining the parts back together reproduces your draft; the splitter is a formatting step, not an editor |
| It tells you the cost | The report names the part count, the shortest and longest part, and how the thread counts against the documented daily post allowance |
It will not decide whether the thread was the right format in the first place, and it will not improve a sentence. The format argument is worked through in thread vs single post on X, and the per-part grading is what the reply quality checklist exists for.
The documented numbers behind the counter
Three published limits do all the work here. Everything else on this page is presentation:
| Limit | Documented value | What the splitter does with it |
|---|---|---|
| Standard post / reply | Up to 280 characters | The default per-part budget; the numbering prefix is reserved inside it |
| Longer posts | An X Premium feature, up to 25,000 characters; everyone can read them, only subscribers can create them | Not used — a thread is entries of standard length, so the splitter keeps to the 280 family |
| Daily allowance | 50 original posts and 200 replies per day for unverified accounts, further divided into smaller semi-hourly limits | The report compares your part count against the 50-post figure and warns when a thread alone is a large share of it |
How to split so each entry can be read alone
The mechanical split is the easy half. What makes a thread hold together is that X bundles two- and three-post threads in the timeline but truncates four or more behind a “Show this thread” prompt — and on your profile every entry appears as a separate post in reverse chronological order. Four habits follow from that:
- Read part one as if it were the whole post. It may be all a stranger sees, so it needs the claim, not the wind-up.
- Put the ask in the last part. A reader who reaches the final entry has the full argument and something to answer — and if you would rather the ask travel with part one, decide that deliberately rather than by accident.
- Leave headroom in every part. Editing a published thread happens entry by entry; parts jammed against the limit cannot take a correction without being rewritten.
- Number only when the order carries meaning. Numbers promise a sequence. If the parts could be shuffled, call it a list of separate posts instead — then each one stands on its own.
When the thread is going to run long, the arithmetic matters: the reply limits breakdown covers how the daily allowance is split into intervals, the cadence planner turns those intervals into a session plan, and the engagement strategy guide covers what each format is actually for.
Five free tools: split the thread, check the length, grade a reply, plan the cadence, or generate the angle.