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Free Caption & Tweet Thread Splitter – X, Threads & Mastodon

CheckerTools
CheckerTools
July 27, 2026

// Free · No login · No API key

Caption & Tweet Thread Splitter

Paste a long caption or post, set your character limit, and get it automatically split into a clean, numbered thread — no word ever gets cut in half.

Thread Splitter 100% offline
0 characters

Your thread

Copy each post individually, or copy the whole thread numbered and ready to paste one by one.

Frequently asked questions

Is this thread splitter free to use?

Yes. Splitting text into a numbered thread is completely free with no sign-up or API key required.

Does it split in the middle of words?

No. The splitter always breaks at word boundaries, so no word is ever cut in half across two posts.

Can I change the character limit?

Yes. The default is 280 (X/Twitter), but you can set any limit — for example 500 for Threads or Mastodon.

Does the numbering (like 1/8) count against my character limit?

Yes. The tool reserves space for the " (n/total)" suffix so each finished post, including the numbering, stays under your chosen limit.

Does this tool work without internet?

Yes. Splitting runs fully offline in your browser once the page has loaded.

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Caption & Tweet Thread Splitter by CheckerTools. This tool splits text locally in your browser using a simple word-boundary algorithm. It is not affiliated with or endorsed by X Corp, Meta or the Mastodon project.