X-Split

Split long posts into threads on X/Twitter. Free tier, zero friction.

X-Split turns long X/Twitter posts into clean, numbered threads — automatically. HOW IT WORKS - Install the extension - Go to x.com and open the post button - Type or paste your text past 280 characters in red - A sidebar appears showing each chunk with a copy button - Copy and paste each chunk into X's compose box That's it. No buttons to click. No settings to configure. No accounts to create. FEATURES Smart splitting — Breaks at sentence boundaries (. ! ?) when possible, falls back to word breaks. Your threads read naturally, not chopped mid-word. Auto-split on input — The sidebar appears as soon as your text exceeds 280 characters. Edit or delete text and it stays in sync. URL-aware counting — URLs are counted as 23 characters (matching X's t.co behavior). The extension never splits a URL across two chunks. Per-chunk numbering — Each chunk gets (1/5), (2/5) etc. Choose from parenthesis, brackets, or slash format in settings. Fill mode — Optional toggle to maximize character usage per chunk. Off by default (clean sentence breaks preferred). Re-split — Edit your text after splitting, click the button to re-split. Don't start over. Dark mode — Follows your system preference automatically. Collapsible sidebar — Click X to hide the sidebar. A floating tab stays on screen to reopen it when you need it. Customizable — Click the extension icon in your toolbar to adjust max characters, numbering style, URL counting, and fill mode. WHY X-SPLIT - Free — No subscription, no API fees, no hidden costs - Private — All processing happens in your browser. Zero data collection. No analytics. - Lightweight — Vanilla JavaScript, zero dependencies, no build step - Works inside x.com — No tab switching, no external editors PRIVACY X-Split does not collect, store, or transmit any personal data. All text processing is local. No third-party services. No analytics. No tracking. Full privacy policy: https://mujtabaj30.github.io/x-split/privacy/