PromptParto is a lightweight web tool for breaking long prompts into manageable parts. It supports multiple split strategies, dark mode, AI-assisted refinement and undo/redo history.

Features

• Flexible splitting - choose automatic splitting, by paragraph or line, a custom delimiter or a regular expression.
• Dark mode toggle - switch themes with a single click or Ctrl+D.
• AI refine - refine any prompt part using Gemini AI directly from the interface.
• Undo/redo - revert changes with Ctrl+Z and Ctrl+Y.
• Drag & drop text files or use the Upload File button, automatic saving, and export to text, Markdown or JSON.
• Animated buttons and badges show progress and give feedback on copy/share actions and successful splits.

Running locally

Simply open index.html in your browser. Styles are in css/style.css and JavaScript in js/components/main.js. The page loads TailwindCSS and other assets from public CDNs, so an internet connection is required on first load. You can also host the project on GitHub Pages, integrated with Cloudflare for enhanced performance and security.

Project structure

/
  index.html
  css/
    style.css
  js/
    components/
      main.js
  prompts/
    example.json

Example prompt

A sample prompt is provided in prompts/example.json. Use the Load Example button (Alt+L) to insert it into the editor.

Stored data

PromptParto saves your settings, saved prompts and history in your browser's localStorage. Use the export buttons to back up your data or the import option to restore it. You can also export individual parts or the entire prompt in text, Markdown or JSON format.

Gemini API key

To use the AI refine features you must provide a valid Gemini API key. Open the AI modal, scroll to Advanced Settings, and paste your key in the Gemini API Key field. The key is saved in your browser's sessionStorage (promptPartoApiKey). Without this key the AI actions will show an error.

Keyboard shortcuts

• Ctrl+Z / Ctrl+Y – Undo/Redo.
• Ctrl+D – Toggle dark mode.
• Ctrl+S – Save current prompt.
• Alt+L – Load example prompt.
• Ctrl+E – Export as text.
• Ctrl+M – Export as Markdown.
• Ctrl+J – Export as JSON.
• Ctrl+Shift+C – Clear all.
• Ctrl+O – Clear output only.
• Ctrl+H – Show history.
• Ctrl+T – Show templates.

Development

Install dependencies with npm install, then run the linters and tests:

npm run lint
npm test

npm run lint checks all JavaScript files under js/ using ESLint and all CSS files with Stylelint. npm test runs the Jest test suite.

The build step (npm run build) outputs the production files to dist/ and automatically generates dist/sitemap.xml based on all HTML files. This ensures search engines always receive an up‑to‑date sitemap when new pages are added.

Fonts

PromptParto bundles the Inter and Vazirmatn typefaces. Both families are distributed under the SIL Open Font License 1.1. Attribution files can be found in assets/fonts/.

Content Security Policy

When hosting the site on GitHub Pages behind Cloudflare, configure a strict Content-Security-Policy header. A recommended policy is:

default-src 'self' blob:;
script-src 'self' https://cdn.tailwindcss.com https://cdn.jsdelivr.net https://cdnjs.cloudflare.com https://static.cloudflareinsights.com 'nonce-RasoulCSP';
style-src 'self' https://fonts.googleapis.com https://cdnjs.cloudflare.com https://cdn.jsdelivr.net 'nonce-RasoulCSP';
style-src-attr 'none';
style-src-elem 'self' https://fonts.googleapis.com https://cdnjs.cloudflare.com https://cdn.jsdelivr.net;
font-src 'self' https://fonts.gstatic.com https://cdnjs.cloudflare.com;
img-src 'self' data:;
connect-src 'self' https://static.cloudflareinsights.com https://api.github.com https://orcid.org https://about.me https://www.researchgate.net https://www.linkedin.com https://github.com;
object-src 'none';
base-uri 'self';
form-action 'self';
frame-ancestors 'self';

This policy keeps only the domains required for CDN assets and analytics.