X Thread Splitter – Split Long Posts into Numbered Tweets
You wrote the long version — now make it postable. Paste any long post and this splitter breaks it into clean, numbered tweets of at most 280 characters each, ready to copy one by one into X.
X posts cap at 280 characters, so a real thread has to be cut with care: break on word boundaries, never mid-word, and leave room for the (1/5) numbering so the count does not push a tweet over the limit after the fact. This splitter does exactly that — it packs your words into the fewest tweets that fit, reserves space for the numbering before it splits, then shows every tweet in its own card with its real character count and a copy button, plus a copy-all for the whole thread. Your text never leaves your browser. It is the tool its own library's author reaches for when writing FAN SZN threads.
How to use it
Paste your post — the full long text, paragraphs and all.
Choose numbering — on by default, so readers see 1/5, 2/5 and know more is coming.
Split it — tweets appear as cards with real character counts.
Copy and post in order — each tweet as a reply to the previous one.
What you get
True 280 limit — numbering space is reserved before splitting, so no tweet overflows.
Word-safe breaks — never cuts a word in half (a single word longer than a tweet is the only exception).
Copy one or all — a copy button per tweet, plus copy-the-whole-thread.
Private — splitting runs in your browser; your draft is never uploaded.
Frequently asked questions
How many characters can one tweet hold?
280 characters on a standard X account, including spaces and the thread numbering. This splitter counts the numbering inside the 280, so every card shows its true final length.
Why does the numbering matter?
Readers who see 1/5 know the post continues and are more likely to follow the thread. It also helps you post the tweets in the right order.
Will it break my links or hashtags?
Links and hashtags are treated as words and kept whole. A single link counts toward the 280 like any text here; note that X itself shortens links, so a tweet with a link has a little more room on X than this counter shows.
Is X Premium's long post format supported?
Premium accounts can post long-form directly, but threads still get more reach and are readable by everyone. If you have Premium, the splitter is still handy for breaking a long post into hook-sized parts.