Twitter Thread Maker for X and Instagram Threads
Paste any script, article, or long note and turn it into a ready-to-post thread. Toolflix splits your text into 280-character X/Twitter posts or 500-character Instagram Threads cards with numbering, counters, and one-click copy. The free splitter runs locally in your browser with no sign-up.
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Convert a script into a postable thread
Use this page when you already have a YouTube script, blog outline, newsletter draft, or meeting note and need it broken into social posts. Start with the splitter, then check the final hook length in the Character Counter or clean the case in the Text Case Converter.
How It Works
The rule-based mode (no key required) detects sentence boundaries and packs them into chunks that fit within the platform character limit — 280 for X or 500 for Threads. Enable AI mode and add your OpenAI key to get an AI-rewritten thread with strong hooks, punchy middle cards, and a CTA closer. Your key stays in your browser only — zero server uploads.
Pro Tips
- Card 1 is your hook. Edit it manually after splitting to lead with a bold claim, stat, or question.
- Toggle numbering off if you want to post cards individually without the [n/total] tag.
- Orange border means a card is over the limit — shorten it or move a sentence to the next card.
- Copy All exports every card separated by
---— useful for pasting into a scheduler like Buffer or Typefully.
Platform Limits
𝕏 (Twitter / X) enforces 280 characters per post, counted in UTF-16 code units — emojis count as 2. Instagram Threads allows 500 characters. The counter in each card reflects the final text including the [n/total] numbering tag.
Frequently Asked Questions
Is this thread splitter free?
Yes — the rule-based mode is completely free with no account or sign-up required. The optional AI mode uses your own OpenAI API key (BYOK), so you only pay OpenAI directly for what you use.
How many characters does X (Twitter) allow per post?
X (formerly Twitter) allows 280 characters per post for most accounts. Premium (X Blue) subscribers get up to 25,000 characters. This tool defaults to 280 and highlights any card that exceeds the limit.
Does it work for Instagram Threads?
Yes. Switch the platform to Threads in the toolbar and the splitter uses the 500-character limit. Each card is formatted and counted independently so you can copy and post them one by one.
Can I turn a YouTube script or blog post into a Twitter thread?
Yes. Paste the script, article, or outline, choose X for 280-character posts or Threads for 500-character cards, then copy each card in order.
Does my text get sent to a server?
No. All splitting in rule-based mode happens entirely in your browser — nothing is sent anywhere. In AI mode, your text is sent directly to the OpenAI API using your own key; Toolflix never sees it.