Write once. Post everywhere. Without rewriting the same idea five times.

Longform Splitter is a tiny, offline tool: paste a blog post or essay, add a title and hashtags, hit Generate, and get:

- X thread: auto-split and numbered, every post under 280 characters

- LinkedIn post: hook + arrow-point structure + call to comment

- Instagram caption: numbered tips, save/share prompt, hashtags

- Reddit post: bold title, TL;DR, full body

- Newsletter summary: "In short" line + bullet points

Copy any version with one click, or export everything to a single Markdown file.

Private by design: one HTML file, no install, no account, no AI API, nothing uploaded. Works on Windows, macOS, Linux and ChromeOS in any modern browser.

It's rule-based, not AI - think of it as a fast first draft you polish, not a replacement for your voice.

License: personal and commercial use. Please don't resell or redistribute the tool itself.