HTML-to-XLSX Converter

Professional Table Conversion Utility
Version 2.1.3 | Build 2024.07.28

Overview

A retro-styled, professional HTML table to Excel converter with a distinctive MS-DOS terminal aesthetic. Convert HTML tables to XLSX format entirely in your browser with zero server transmission - all processing happens client-side for complete privacy.

Features

Dual Input Methods

• File Upload: Drag & drop or browse for HTML files (.html, .htm, .txt)
• Direct Paste: Paste raw HTML code directly into the application

Advanced HTML Processing

• ✓ Multiple tables detection and selection
• ✓ Colspan and rowspan support (merged cells)
• ✓ Nested table handling
• ✓ Malformed HTML recovery
• ✓ Unicode and special character support
• ✓ Automatic table detection from full HTML documents

Professional Output

• XLSX format (Excel 2007+)
• Preserves table structure with merged cells
• Multiple sheets for multiple tables
• UTF-8 encoding for international characters
• Auto-generated or custom sheet names from table captions

Retro-Professional Design

• MS-DOS terminal-inspired interface
• High-contrast green-on-black color scheme
• Monospace typography throughout
• Scanline effects and text glow
• Fully responsive layout

Usage

Method 1: File Upload

1. Open index.html in your browser
2. Click "FILE UPLOAD" (default mode)
3. Drag & drop an HTML file or click to browse
4. Review detected tables
5. Click "CONVERT TO XLSX"
6. Download your converted file

Method 2: Paste HTML

1. Open index.html in your browser
2. Click "PASTE HTML" button
3. Paste your HTML code into the textarea
4. Review detected tables
5. Click "CONVERT TO XLSX"
6. Download your converted file

Multiple Tables

When multiple tables are detected, you can:

• Select which tables to include in the conversion
• Each table becomes a separate sheet in the Excel file
• Sheet names are derived from table captions or IDs

Technical Details

Client-Side Processing

• All conversion happens in your browser
• No data sent to any server
• Complete privacy and security
• Works offline after initial load

Technologies Used

• SheetJS (xlsx): XLSX file generation
• DOMParser API: HTML parsing
• FileReader API: File upload handling
• Vanilla JavaScript: No framework dependencies
• Pure CSS: Custom retro styling

Browser Compatibility

• Chrome (latest 2 versions)
• Firefox (latest 2 versions)
• Safari (latest 2 versions)
• Edge (latest 2 versions)

File Limits

• Maximum file size: 10MB
• Maximum paste length: 5,000,000 characters
• No practical limit on table size (browser memory dependent)

File Structure

HTML-to-XLSX/
├── index.html          # Main application page
├── css/
│   └── style.css       # Retro-professional styling
├── js/
│   └── script.js       # Application logic
├── test_simple.html    # Test file: simple table
├── test_complex.html   # Test file: merged cells
├── test_multiple.html  # Test file: multiple tables
└── README.md           # This file

Testing

Three test files are included:

1. test_simple.html: Basic table with headers and data
2. test_complex.html: Table with colspan and rowspan
3. test_multiple.html: Document with multiple tables

Use these to verify functionality after setup.

Features Roadmap

Potential future enhancements:

• CSV output format
• Table preview before conversion
• Custom column filtering
• Batch file processing
• Style preservation options
• Command-line interface mode

Privacy & Security

• ✓ 100% client-side processing
• ✓ No data transmission to servers
• ✓ No cookies or tracking
• ✓ No external API calls (except CDN for SheetJS)
• ✓ Works completely offline

License

Open source - free to use and modify.

Credits

Built with SheetJS Community Edition
Retro design inspired by classic MS-DOS interfaces

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TYPE 'HELP' FOR DOCUMENTATION
SYSTEM READY_