Turning an article into a clean X/Twitter thread
Paste a long-form piece of writing and this tool splits it into individual tweets at natural sentence boundaries (falling back to word boundaries only when a single sentence is too long), each kept under 280 characters including space reserved for numbering. Add hashtags to append to the final tweet, then copy each tweet individually or the whole thread at once.
Why this splits at sentence boundaries before ever resorting to word boundaries
Splitting mid-sentence or mid-word makes a thread awkward to read, forcing a reader to jump to the next tweet mid-thought. Keeping whole sentences together whenever they fit is the default behavior, and the tool only breaks within a single sentence as a fallback, specifically when that one sentence alone is too long to fit in a single tweet no matter where else the split happens.
Why numbering reserves character space rather than being added afterward unconditionally
Appending "(12/12)" to a tweet that's already at the 280-character limit would push it over - reserving a small amount of room for the numbering before splitting ensures every numbered tweet still fits within the real limit, rather than requiring a second pass to fix any tweet that ends up too long once numbered.
Why the character count shown may differ slightly from what X itself would count
This counts raw characters toward the 280 limit - X has special handling for links (which always count as a fixed short length) and some Unicode characters, so very link- or emoji-heavy tweets may have a little more practical room in the real app than the raw count shown here suggests.