Splitting text into tweets

X gives you 280 characters — a thread gives you as many as you need. Turn long text into numbered, paste-ready posts.

X's limits

Standard posts: 280 characters.
Premium subscribers can write posts up to 25,000 characters — but long posts collapse behind "Show more", and threads still get far better read-through.
Links count as roughly 23 characters regardless of their real length.

Build the thread before you post

Open the splitter with the limit pre-set to 270 — a little under 280 leaves room for the numbering.
Paste your text and turn on Number Each Part: each post gets tagged [Part 2/7], so readers can tell mid-thread posts from stand-alone ones.
Click Split Text, then use Copy Next — it keeps track of which post you're on while you work down the thread reply-by-reply.

Cuts land on word boundaries, so no post ends mid-word — the single biggest tell of an auto-chopped thread.

Same trick, other platforms

Bluesky (300) and Mastodon (500 by default) work the same way — set the limit to match and post the parts as replies. All the numbers are in the character limits table.

Nothing you paste is uploaded or stored — the splitting happens entirely in your browser.