InvoiceVelvet is the ultimate lightweight solution for freelancers and agencies who need to bill clients without the hassle of complex software.

Built for the modern web, this Single-File PHP Script requires absolutely no database (MySQL) setup. It runs on a lightning-fast flat-file JSON architecture, meaning you can upload it to any server and start generating professional invoices in seconds.
Why Choose InvoiceVelvet?

Most invoice scripts look like they were built in 2010. InvoiceVelvet features a stunning Dark Mode UI with "Glassmorphism" effects, smooth transitions, and a premium feel that you and your clients will love. Despite the dark interface, it generates clean, ink-saving white PDFs automatically when printed.

Core Benefits:

• Zero-Config Deployment: Upload one file, and you are live.
• Privacy Focused: Data is stored locally on your server. No third-party APIs.
• Agency Ready: Support for multiple currencies and custom company branding.

• No Database Required: Uses a robust JSON flat-file system.
• Single-File Architecture: The entire engine runs from index.php.
• Multi-Currency Support: Native support for USD ($), EUR (€), GBP (£), INR (₹), and JPY (¥).
• Dynamic Branding: Set your "Company Name" per invoice instantly.
• Smart History: Automatically saves your last 50 invoices for quick re-prints.
• Premium UI/UX: Built with Tailwind CSS (CDN) featuring modern glassmorphism design.
• Print-Perfect CSS: Smart styling automatically converts the Dark UI to a clean White Paper layout for printing/PDFs.
• One-Click Copy: Copy Invoice IDs to clipboard instantly.
• Secure: Includes CSRF protection and input sanitization.

PHP 8.0 or higher.JSON Extension enabled (Standard on almost all hosting providers).Write Permissions: The script requires write permissions (755 or 777) for the folder to create the data.json file.

Installation is instant:

1. Upload: Upload index.php to your server (root or subfolder).
2. Permissions: Ensure your server folder has write permissions so the script can create the storage file (data.json).
3. Run: Open the URL in your browser.

How to use:

1. Enter your Company Name and select your Currency.
2. Fill in the Client Details and add your Billable Items.
3. Click "Generate Invoice".
4. To save as PDF: Click the "Print PDF" button and select "Save as PDF" in your browser's print dialog.