Invoice Generator Tool

Finance Overview

$12,450

Total Invoiced

$3,200

Pending Payments

14

Active Clients

82%

Paid Rate

INVOICEFLOW

Business Info

Company Name Address 123 Business Lane, NY

Client Info

Client Name Address 456 Market St, CA

Line Items

Tax (%)

My Company

Address Line

INVOICE

#INV-001 | Date: April 2, 2026

Bill To:

Client Name

Client Address

Description	Qty	Rate	Amount

Subtotal:$0.00

Tax (10%):$0.00

Total:$0.00

Notes: Please pay within 15 days of receiving this invoice. Thank you for your business!

 

Key Technical Features

• Asynchronous DOM Syncing: The tool uses an oninput event listener strategy. As the user types in the sidebar, the render() function re-calculates the financial data and updates the HTML of the preview pane instantly.

• Vector-to-Bitmap Export: To bypass the inconsistencies of browser printing, it uses html2canvas to render the invoice as a 2x scaled image, which is then embedded into a jsPDF document. This preserves the exact font-rendering and spacing.

• Recursive Item Injection: The "Add Item" feature allows for an unlimited number of line items, with the calculation engine automatically iterating through all input groups to find a cumulative subtotal.

• Responsive Layout:

  • Desktop: Utilizes a sidebar-to-canvas split view.

  • Mobile: The sidebar becomes a scrollable form at the top, while the preview scales to the width of the screen using CSS.