See the tweets before you post them.

A free X account is hard-capped at 280 characters per post. Paste more than that and the platform will not take it, so a longer take has to become a thread. X Premium raises the ceiling to 25,000 characters and folds the rest behind a Show more, which is why the switch under the box changes the answer: the same take is six tweets on a free account and one long post on a paid one. Most splitters quote 280 and stop, which is the wrong answer for anyone who pays.

The counter is characters, not words, and an emoji or a non-Latin letter can count as more than one. Links are counted as written here; X shortens them on its side, so a take that sits within a few characters of the cap is worth a second look in the composer.

The splitter keeps your structure rather than chopping at 280. It packs whole paragraphs into a tweet while they fit; only a paragraph too long for one tweet breaks into sentences, and only a sentence too long for one tweet breaks into words. Quotes, brackets and list numbers stay with the line they belong to, and a link is never broken across two tweets.

You can decide the breaks yourself: three dashes on their own line start a new tweet, and the splitter respects them, only stepping in when one of your own segments still runs past the limit. That is the same convention Sonar stores a thread in, so a thread you shape here behaves the same way inside the product.

The first tweet is the whole thread for most readers, so it has to work alone: the claim, or the number, or the moment, with no wind-up. A thread that opens with "a thread on pricing" has spent its first tweet on a label. Then every tweet after it should be worth reading on its own, because the timeline shows them one at a time and people arrive in the middle.

Length is a decision, not an accident. Six tweets that each carry an idea beat twelve that carry half of one. If the splitter turns your take into eleven tweets, that is usually a sign the take is two takes.

This is not a model of what Sonar does, it is the function Sonar runs. When you save an X draft, the same splitter applies the same physics, and the publisher posts the tweets it produced, in order, as a native thread. Sonar writes the take first: it reads your calendar, meetings, Slack and notes, finds the moments worth saying, and drafts for LinkedIn and X in your own voice, each room in its own register. How Sonar posts to X or how a week becomes posts.