A responsive and interactive Sales Invoice Form with built-in JavaScript functionality to add products, calculate totals, apply discount and tax, and generate a professional printable receipt.

This lightweight HTML template is perfect for small businesses, freelancers, POS systems, or any app that needs an invoice generator without a backend.

Users can input invoice number, date, customer details, product info (code, description, quantity, unit price), and dynamically see calculations for subtotal, discount, tax, and total. Once all data is entered, clicking “Generate Receipt” produces a formatted receipt ready for printing.

Key Features:

• Clean and modern invoice form design

• Customer and invoice info input section

• Product entry with quantity and unit price

• Auto calculation of subtotal, tax, discount, and total

• Button to generate a receipt preview

• Print-friendly output area

• Written in pure HTML, CSS & JS (no framework)

• Easy to customize and embed in any project

• Ideal for both online and offline sales systems

• Fully responsive – works on mobile, tablet, desktop

Where It Can Be Used:

• Retail shops & small businesses

• Freelancers & consultants issuing invoices

• POS (Point of Sale) frontend systems

• eCommerce custom checkout pages

• Mobile web apps for invoicing

• SaaS dashboards or accounting tools

• Online shops that need a manual receipt option

• Any system needing client-side invoice print