Invoice Creator WordPress Plugin

A simple and professional WordPress plugin to create, manage, and print invoices directly from your WordPress dashboard.

Features

• Custom Invoice Post Type: Create and manage invoices like WordPress posts
• Auto-Incrementing Invoice Numbers: Automatically generates sequential invoice numbers
• Two-Column Layout: Optimized editing experience on screens above 1000px
• Client Management: Store client details including name, email, phone, and address
• Line Items: Add unlimited service line items with title, description, and price
• Automatic Calculations: Auto-calculates totals from line items
• Professional Print Layout: Clean, print-ready invoice template inspired by modern invoice designs
• Company Branding: Add your company logo, name, contact details, and address
• Draft & Final Invoices: Save as draft or create final invoices
• Customizable Settings: Configure company information from the settings page

Installation

1. Upload the invoice-creator folder to the /wp-content/plugins/ directory
2. Activate the plugin through the 'Plugins' menu in WordPress
3. Go to Invoices > Settings to configure your company information
4. Start creating invoices!

Usage

Creating an Invoice

1. Navigate to Invoices > Add New
2. Fill in the invoice details:
   • Invoice date (defaults to today)
   • Due date (optional)
3. Add client information:
   • Client name (required)
   • Client email, phone, and address (optional)
4. Add line items:
   • Click + Add Line Item
   • Enter service title, description, and price
   • Add as many items as needed
5. The total will auto-calculate based on line items
6. Enter amount already paid (if any)
7. The total due will auto-calculate
8. Add notes/comments if needed
9. Click Save as Draft or Create Invoice

Configuring Company Settings

1. Navigate to Invoices > Settings
2. Configure your company information:
   • Company Name
   • Phone Number
   • Email Address
   • Website
   • Physical Address
   • Company Logo (upload an image)
3. Set the next invoice number if needed
4. Click Save Settings

Printing Invoices

1. Open any created invoice
2. Click the Print Invoice button
3. A print-friendly version will open in a new window
4. Use your browser's print function (Ctrl/Cmd + P)

Features Details

Auto-Incrementing Invoice Numbers

• Invoices are automatically numbered starting from INV-0001
• The numbering increments with each new invoice
• You can customize the starting number in Settings

Two-Column Layout

• On screens wider than 1000px, the edit screen displays in two columns:
  • Left Column (40%): Invoice details, client details, notes
  • Right Column (60%): Line items and totals
• On smaller screens, it stacks vertically for mobile-friendly editing

Line Items Management

• Add unlimited line items
• Each item includes:
  • Service Title
  • Service Details/Description
  • Price
• Remove items with a single click
• Totals update automatically as you add/edit items

Professional Print Template

• Clean, modern design based on professional invoice layouts
• Company branding at the top
• Clear client information
• Itemized service list
• Subtotal and total due breakdown
• Optional notes section
• Print-optimized CSS (removes all WordPress admin elements)

Technical Details

• Version: 1.11
• Author: Chris Arock
• Author URI: https://dcarock.com
• Plugin URI: https://dcarock.com/wordpress
• Requires WordPress: 5.0 or higher
• Tested up to: 6.4
• License: GPL v2 or later

File Structure

invoice-creator/
├── invoice-creator.php          # Main plugin file
├── includes/
│   ├── class-invoice-post-type.php    # Custom post type registration
│   ├── class-invoice-settings.php     # Settings page
│   ├── class-invoice-meta-boxes.php   # Meta boxes for invoice fields
│   └── class-invoice-print.php        # Print template handler
├── assets/
│   ├── css/
│   │   └── admin.css            # Admin styling (2-column layout)
│   └── js/
│       ├── admin.js             # Line items management & calculations
│       └── settings.js          # Settings page (logo upload)
└── README.md                    # This file

Support

For issues, questions, or feature requests, please visit:

• Website: https://dcarock.com
• Email: support@dcarock.com

Changelog

1.11

• Fixed: Form submission now works properly using native JavaScript submit
• Fixed: Removed wp_update_post() calls from save handler to prevent conflicts
• Improved: Set WordPress post status fields directly before form submission
• Enhanced: Added console logging for debugging button clicks

1.10

• Fixed: Invoice save/create buttons now work correctly
• Improved: Rewritten button logic for better handling of draft and published invoices
• Enhanced: When creating/updating an invoice, it now opens in a new window for printing AND redirects the main window to All Invoices page
• Enhanced: Button labels now change based on invoice state:
  • New invoice: "Save as Draft" / "Create Invoice"
  • Draft invoice: "Update Draft" / "Publish Invoice"
  • Published invoice: "Update and Save as Draft" / "Update Invoice"

1.9.2

• UI/UX improvements

1.9.1

• Add automatic rewrite flush on version update

1.0

• Initial release
• Custom invoice post type
• Company settings page
• Line items management
• Auto-calculations
• Print functionality
• Two-column responsive layout

License

This plugin is licensed under the GPL v2 or later.

Copyright (C) 2025 Chris Arock

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.