Free Online List Sorter by Character Length Tool

Application Overview

This is a high-performance, single-file browser utility designed to transform raw lists into structured datasets sorted by length or character count. It is built for poets needing to organize verse lengths, songwriters structuring lines, and developers analyzing string arrays.

Core Features

• Multiple Sort Criteria: Sort by Shortest-to-Longest, Longest-to-Shortest, or standard Alphabetical order.
• Smart Cleaning: Options to automatically strip whitespace, remove duplicate entries, and ignore empty lines.
• Real-Time Processing: Instant feedback as the list is sorted using high-performance Vanilla JS.
• Copy to Clipboard: One-click functionality to copy the resulting list.
• Line Statistics: Display of the total line count and average character length for quick analysis.

UI/UX Layout

• Header: Minimalistic title with a clean, centered layout.
• Input Section: A large, resizable textarea for pasting text blocks.
• Control Panel: A sleek toolbar featuring segmented buttons for Sort Direction (Asc/Desc) and Criteria (Length/Alphabetical).
• Results Section: A read-only display box with line numbers, allowing users to quickly verify the output.
• Responsive Grid: On desktop, use a side-by-side split screen (Input/Output). On mobile, stack them vertically.

Aesthetic & Styling

• Color Palette: A vibrant, professional light-mode aesthetic using Slate-900 for text, Indigo-600 for primary buttons, and Zinc-50 for backgrounds.
• Typography: Inter or system-sans fonts for maximum readability.
• Transitions: Use CSS transitions (all 0.2s ease-in-out) for all UI interactions, button hovers, and list reordering animations.

Technical Constraints & Directives

• Strictly In-Memory: The app must NOT use localStorage, sessionStorage, or cookies. The state is volatile; if the page refreshes, the data clears. This ensures compliance with privacy and iframe restrictions.
• No Dependencies: Use CDNs for Tailwind CSS and Lucide icons only. Keep the logic pure Vanilla JS.
• Sandboxed Compatibility: Ensure all functionality works within a null-origin iframe.
• Error Handling: Gracefully handle empty inputs or non-text files without using browser alert() or prompt() methods. Instead, render custom, styled error alerts within the application DOM.
• Performance: Ensure efficient array processing (Array.sort()) to handle thousands of lines without UI freezing.