Create professional invoices for free with this online generator. Save, edit, and download PDFs directly in your browser. No sign-up, no upload, 100% private.
AI Generation Prompt
Overview
A 100% client-side, browser-based invoice generator designed for freelancers and small business owners. The tool provides a live, interactive preview that updates in real-time as users fill out their invoice details. All data is processed locally, ensuring privacy.
Core Features
- Dynamic Line Items: Ability to add, remove, and edit multiple line items with automatic subtotal, tax, and discount calculations.
- Local Storage Persistence: Automatically saves input fields to the browser's LocalStorage, so users never lose progress on a refresh.
- Instant PDF Export: Utilizes the browser's print-to-PDF functionality or a dedicated client-side library to export high-quality PDF files.
- Data Import/Export: Functionality to download and upload JSON state files for moving drafts between different devices.
- Live Preview: A split-screen UI that allows users to see exactly what the final invoice looks like while editing.
UI Layout
- Header: Simple, clean header with 'Clear', 'Save Draft', 'Load Draft', and 'Download PDF' action buttons.
- Main Tool Area: A responsive two-column grid layout.
- Left Column: A scrollable form containing sections for 'Sender Info', 'Client Info', 'Invoice Details', and 'Line Items'.
- Right Column: A static, styled preview area that renders the invoice using crisp typography and clear layout blocks.
Design & Aesthetic
- Palette: Professional light-mode aesthetic. Use a base of #FFFFFF (background), #F4F4F4 (secondary), #333333 (primary text), and #007BFF (primary action blue). No dark mode.
- Typography: Modern sans-serif stack for inputs and interface; clean serif or sans-serif for the rendered invoice.
- Interactions: Subtle, smooth transitions on input focus and hover states for buttons. No complex animations.
Technical Constraints
- Single File: The entire application must be contained within a single HTML file (CSS and JS embedded).
- Framework-Free: Use vanilla JavaScript (ES6+). No frameworks, no build systems, no npm packages.
- Responsive: The UI must stack from two columns to one on smaller screens.
- Sandbox-Ready: Must function perfectly inside a sandboxed iframe without needing external assets or API connections.
- No Branding/Footer: Strictly no branding, logos, links to other sites, or page footers.
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Frequently Asked Questions
Everything you need to know about using this application.
How do I create an invoice without uploading my data?
This tool runs entirely in your browser using client-side processing, ensuring your financial data never leaves your device.
Can I save my invoice progress?
Yes, the tool utilizes your browser's local storage to automatically save your invoice drafts, allowing you to return and continue editing at any time.
Is this invoice generator really free?
Yes, this is a completely free, browser-based utility that requires no registration, subscriptions, or payments to generate and download unlimited PDF invoices.
