Thread splitter

Paste long text and get numbered posts that each fit X, Bluesky, Threads or Mastodon, split between sentences and counted the way each network counts.

Free
No sign-up
Runs in your browser

Your text

Put a line with --- where a new post must start.

Numbering

Runs in your browser, with no AI. Nothing you type is sent anywhere.

Your X thread

Up to 280 characters each

Paste your text and the posts show here, ready to copy one by one.

The same text on other networks

How each post is counted

Every network counts a post differently

The same text can take three posts on one network and five on the next. This is what each one counts.

X

280

Each post holds 280 characters. X counts emoji and Chinese, Japanese and Korean characters as 2, and every link as 23, however long. With Premium or Basic a post holds 25,000, so most text needs no thread at all.

Bluesky

300

Each post holds 300 characters, counted the way you see them, so any emoji is 1. A post also stops at 3,000 bytes, which only long runs of emoji or non-Latin text reach. Links count in full.

Threads

500

Each post holds 500 characters, but Threads counts every emoji as its size in bytes: a smiley is 4 and a family emoji 25. A post with more than 5 links fails, so the splitter moves extra links to the next post.

Mastodon

500

Each post holds 500 characters on most servers; set yours if it allows more. Every link counts as 23, and a mention counts without its server: @[email protected] counts as @name.

Reference

Thread post limits for every network

How long each post in a thread can be, and what each network counts toward it.

Network	Per post	An emoji counts as	A link counts as	Also capped at
X	280	2 each	23 characters	25,000 with Premium
Bluesky	300	1 each	Its full length	3,000 bytes
Threads	500	Its size in bytes (4 or more)	Its full length	5 links
Mastodon	500	1 each	23 characters	—