Tweet Thread Splitter - Long Text to Twitter Thread

What is a tweet thread?

A tweet thread is a series of connected tweets posted in reply to each other, allowing you to publish longer content than a single tweet permits. Each tweet in the thread is numbered, e.g. (1/5), (2/5), so readers know how many posts to expect.

Splitting strategy

This tool uses greedy sentence-packing: it fills each tweet as full as possible, only moving to a new tweet when the next sentence would exceed the limit. If a single sentence is longer than the limit, it is split at word boundaries. The numbering is calculated in two passes so the label length itself is accounted for.

X/Twitter character limit history

Twitter launched with a 140-character limit, chosen to fit within a standard SMS message (160 characters) with room for a username prefix. In November 2017, Twitter doubled the limit to 280 characters for most languages. A few important counting rules apply: CJK characters (Chinese, Japanese, Korean) still count as 2 units each, while all URLs are normalized and counted as exactly 23 characters regardless of their actual length, thanks to Twitter's t.co link shortener.

Thread best practices

• Hook first: open the first tweet with your most compelling statement or question - readers decide whether to expand the thread based on tweet 1.
• Number your tweets: include a prefix like (1/7) so readers know the total length upfront and feel committed to reading through.
• Natural thought boundaries: end each tweet at a complete idea rather than mid-sentence so the thread is readable even if someone only sees one card.
• Vary the format: mix text with images, polls, or video to maintain engagement across a long thread.

X Premium long-post alternative

X Premium subscribers can publish posts of up to 25,000 characters directly as a single post, bypassing threads entirely. If your audience is on X Premium or you prefer a single scrollable post over a threaded format, this is a simpler alternative. The thread format remains useful for non-Premium accounts and for content designed to be shared one tweet at a time.