Tweet Thread Splitter
Paste a long post and split it into a numbered Twitter/X thread of character-limit-safe tweets that never break a word in half. Runs entirely in your browser, no server, no sign-up.
What this tool does
Paste a long piece of text and split it into a numbered Twitter/X thread of character-limit-safe tweets — without ever breaking a word in half. Everything runs locally in your browser: nothing is uploaded, it works offline once loaded, and there is no sign-up.
How it works
- Paste your text.
- Pick the characters per tweet (default 280, X/Twitter's standard limit). Use a smaller number for a tighter thread, or a larger one for X Premium long posts (up to 25,000).
- Choose a numbering style (or turn it off).
- Choose how length is counted (see below).
- Keep sentence-boundary breaks on (default) so tweets rarely end mid-thought.
The splitter packs whole words greedily into each tweet, so a tweet is filled as much as possible while always staying at or under the limit — and a word is never split across two tweets. The counter is included in the count, so the final tweet text never exceeds your limit.
Numbering styles
| Style | Looks like |
|---|---|
| parens (default) | …your text (1/5) |
| slash | …your text 1/5 |
| dotted | 1. your text (numbered-list style, prepended) |
| none | no counter at all |
Counting: characters vs. UTF-16
| Count | What it measures | When to use |
|---|---|---|
| chars (default) | Unicode characters — one emoji counts as 1 | Simple, predictable splitting |
| utf16 | UTF-16 code units — an emoji or other astral character counts as 2 | Matching how X and most JavaScript clients weigh emoji |
If your text has lots of emoji and you want the count to line up with what X actually shows, choose utf16.
Sentence-aware breaks
With Prefer breaking on sentence boundaries on (the default), the splitter
starts a fresh tweet after a sentence ends (., !, ?) whenever it can, so a
tweet rarely cuts off mid-thought. A single sentence that is longer than one whole
tweet still falls back to word-packing — and a word is never broken.
Long words and URLs
A "word" longer than a whole tweet — for example a very long URL — is hard-split across tweets on safe character boundaries, so nothing is ever dropped from your text.
Examples
| Input | Settings | Result |
|---|---|---|
| A 600-character paragraph | 280 · parens | 3 tweets ending (1/3), (2/3), (3/3) |
hello world | 280 · parens | hello world (1/1) |
just a short note | 280 · none | just a short note (one tweet, no counter) |
First point. Second point. | 280 · dotted · sentences on | 1. First point. / 2. Second point. |
FAQ
Is it free and private?
Yes — your text never leaves your device, and the tool keeps working offline once the page has loaded.
Does it break words in the middle?
No. Whole words are kept together; the only thing ever split is a single "word" that is by itself longer than one whole tweet (like a long URL), so no content is lost.
Does the counter count toward the limit?
Yes. The numbering is included in the per-tweet count, so every emitted tweet — counter included — stays at or under your chosen limit.
Which numbering style should I use?
parens ((1/5)) is the most common
Twitter convention; slash (1/5) is the same without parentheses; dotted
(1.) reads like a numbered list; none drops the counter entirely.
What limit should I use?
Leave it at 280 for standard X/Twitter posts. Use a higher value if you post with X Premium's longer limit, or a lower value to keep each tweet short.
Developer & Automation Access
Run it from the terminal
Same engine as this page, headless — via the gizza CLI:
gizza tool tweet-thread-splitter "Paste the long post you want to turn into a thread…"New to the CLI? Get gizza →
Open it by URL
Pre-fill and auto-run this tool with query parameters — the names match the API/CLI:
https://gizza.ai/tools/tweet-thread-splitter/?text=Paste%20the%20long%20post%20you%20want%20to%20turn%20into%20a%20thread%E2%80%A6&limit=280&numbering=parens&count=chars&prefer_sentences=trueMachine-readable descriptor: tool.json — title + parameters JSON Schema for agents.