What is each network's character limit?

A standard X post is capped at 280 characters, Threads and Bluesky at roughly 500 and 300, and Mastodon usually 500 depending on the server. These limits change over time, so the tool also offers a custom limit if your network differs.

Does the numbering count toward the character limit?

Yes — numbering is ordinary text and consumes the allowance like any other word, so its room is reserved before the split happens. With numbering switched off, the whole allowance goes to your writing.

Can a long link get broken?

No — splits only happen at spaces, so a link always stays whole inside one post. Note that some networks count a link as a fixed length, typically around 23 characters, regardless of how long it actually is.

Is my writing sent to a server?

No — the whole split runs inside your browser and the text never leaves your device. The tool stores no drafts.

SEO & Sharing

Thread Composer

Paste your long piece of writing to get a numbered series of posts, ready to copy one at a time.

Network Character limit Add numbering (1/8)

Your writing

What this is

A thread composer divides one long piece of writing into consecutive posts, each fitting a social network's character limit. A good split breaks at a sentence boundary rather than mid-word or mid-link, and leaves room for numbering like 3/8 that tells a reader how much is left. This tool does both, then puts a copy button on each post so you can paste them in order.

How it works

Splitting is tiered: first at paragraph boundaries, then at sentence endings, and only when neither is possible at a space between words. A word is never cut in half, so a long link stays whole and stays clickable.

The numbering is accounted for before the split rather than after. Adding '10/12' to a post costs five characters, so that room is reserved up front — otherwise the last post that looked like it fitted goes over the limit the moment its number is attached.

The first post decides whether the rest gets read. Write an opening line that stands on its own and says what follows, rather than only announcing that a thread exists — a reader who cannot tell what it is about rarely opens the second post.

How to use it

Choose the target network The character limit adjusts automatically, and can also be set by hand.
Paste your writing The split runs immediately as you type or paste.
Copy each post in order Each card has its own copy button and character count.

Common questions

What is each network's character limit?: A standard X post is capped at 280 characters, Threads and Bluesky at roughly 500 and 300, and Mastodon usually 500 depending on the server. These limits change over time, so the tool also offers a custom limit if your network differs.
Does the numbering count toward the character limit?: Yes — numbering is ordinary text and consumes the allowance like any other word, so its room is reserved before the split happens. With numbering switched off, the whole allowance goes to your writing.
Can a long link get broken?: No — splits only happen at spaces, so a link always stays whole inside one post. Note that some networks count a link as a fixed length, typically around 23 characters, regardless of how long it actually is.
Is my writing sent to a server?: No — the whole split runs inside your browser and the text never leaves your device. The tool stores no drafts.

Notes

Network character limits can change; use the custom limit if you need a different one.
The text is processed in your browser and sent nowhere.