Split a long note into numbered posts for a 280 or 500 character cap, then copy them.
Paste a long note and split it into posts. X uses 280 characters and Threads uses 500. Those caps are the ones on this page, not a live read of the platform. Each card is numbered 1/N, and that prefix counts toward the limit.
1/2 A longer note that should break into numbered posts so each one stays inside the platform limit, with the count included. The number at the start of each post counts toward the cap, so the words stop earlier than a raw cut. Paste the cards into X or Threads yourself. Nothing
2/2 on this page posts for you, and the 280 and 500 caps are the ones written here rather than a live read of either platform.
A note longer than 280 characters, set to X, becomes 1/2, 2/2, and so on. The “1/2 ” prefix is inside the 280, so the words stop earlier than a raw character cut — you won’t blow the limit by accident.