🏆 FI Invoice Generator – Simple & Easy Invoice & Bill Maker (GPL Source Code Description)

SEO Keywords: invoice maker app, bill generator PHP, invoice management system, online billing software, invoice PDF generator, billing script, GPL invoice software.

🚀 Overview

FI Invoice Generator is a lightweight and user-friendly invoice and billing application designed for freelancers, small businesses, and agencies who need a quick and professional way to create and manage invoices.
With its simple UI and intuitive workflow, users can generate invoices, add clients, manage items, apply taxes and discounts, and instantly download or email the final PDF.

The system runs entirely on PHP + MySQL and can be deployed on any web server. It’s an ideal choice for developers looking for a ready-to-use billing solution or a base to build advanced accounting systems.

✨ Key Features

• 🧾 Invoice Creation: generate invoices quickly with customizable templates.
• 👤 Client Management: save and reuse customer details for repeat billing.
• 💵 Tax & Discount Support: flexible VAT and discount fields per item or invoice.
• 📦 Product/Service Items: add multiple items with unit price and quantity.
• 📧 Email Invoices: send PDFs directly to clients with one click.
• 💾 PDF Export: generate printable, professional invoices in PDF format.
• 📊 Reports & History: view all invoices, payments, and outstanding balances.
• ⚙️ Currency & Localization: support for multiple currencies and languages.
• 🔐 User Login: secure dashboard with role-based access.
• 🎨 Clean & Modern UI: responsive design using Bootstrap for desktop and mobile devices.

⚙️ Technical Stack

• Language: PHP 8.x+
• Database: MySQL / MariaDB
• Frontend: HTML5, CSS3, JavaScript, Bootstrap 5
• PDF Generation: TCPDF / DomPDF (depending on version)
• Server Requirements: Apache / Nginx with PHP and MySQL support

Expertise Note: built following MVC structure for extensibility — easily adaptable for SaaS or CRM integration.

🧩 Installation Guide

1. 📦 Upload the script files to your hosting directory (e.g., public_html/invoice).
2. 🧰 Create a MySQL database and user.
3. 🗄️ Import the provided invoice.sql file into your database.
4. ⚙️ Configure your database credentials in config.php or .env.
5. 🔐 Access the admin panel and create your first invoice.
6. 📤 Download or email generated invoices to your clients.

📦 Deliverables

• ✅ Full PHP source code
• ✅ SQL database dump
• ✅ Invoice and billing templates
• ✅ PDF generator module
• ✅ User authentication system
• ✅ Documentation & setup guide
• ✅ GPL HTML description (this file)

📱 Supported Platforms

• Server OS: Linux / Windows with PHP 8+
• Database: MySQL / MariaDB
• Browsers: Chrome, Firefox, Edge, Safari
• Devices: responsive design for desktop, tablet, and mobile

🧠 Notes

• License: GPL – allows editing, reuse, and redistribution under GNU terms.
• Customization Tips: add recurring invoices, payment gateway integrations, or multi-user modules.
• SEO Assurance: optimized for search terms such as “invoice maker,” “PHP billing software,” and “invoice generator system.”
• Performance Tip: enable caching for static templates and minimize PDF generation delay.

👨‍💻 Original Developer Credit

Original script concept and design by the CodeCanyon / PHP marketplace author.
This version is released under GNU GPL License for educational and open-source usage.
Reference: Original Marketplace Listing.

🔒 Disclaimer

Distributed under the GNU General Public License (GPL).
Not affiliated with any invoicing software brand or provider.
All sample client data, logos, and template images are for demonstration purposes only and must be replaced before production.

• Use HTTPS to protect invoice data.
• Remove demo accounts and set strong admin credentials.
• Comply with local invoicing and tax record regulations.