🧾 SoloInvoice (MicroBill)

Free · Offline · Professional PDF Invoice Generator

Create beautiful, professional PDF invoices instantly — right in your browser. No login, no monthly fee, no server, no data collection. Forever free.

🌐 Live App: avinashwalton.github.io/SoloInvoice

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✨ Features

Feature	Details
📄 PDF Generation	One-click PDF via browser's built-in print-to-PDF (zero dependency)
🔒 100% Offline	Works without internet. Your data never leaves your browser
💾 LocalStorage Save	Save multiple invoices and reload them anytime
🏢 Business Profile	Save your company info once — auto-loads every time
🖼️ Logo Upload	Add your company logo (PNG, JPG, SVG, max 2MB)
✍️ Signature Upload	Upload your handwritten signature image — appears on every invoice above the signatory name
📦 Line Items	Add unlimited services/products with qty, rate, auto-total
🧮 Tax & Discount	GST/tax %, discount %, shipping charges — all auto-calculated
💱 Multi-Currency	INR ₹, USD $, EUR €, GBP £, JPY ¥, AUD A$, AED د.إ
🏦 Bank Details	Bank name, A/C number, IFSC code, UPI ID on invoice
🖨️ Print Ready	Opens clean invoice-only print window — no form, no UI noise
📤 Share Link	Share app link via Web Share API or clipboard copy
🎨 Color Themes	Pick accent colors for your invoice branding
📱 Responsive	Works perfectly on mobile, tablet, and desktop
🔖 Payment Stamp	Auto PAID / UNPAID / OVERDUE / PENDING stamp on invoice

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🚀 Quick Start

Option 1 — Use Online (Recommended)

Just visit 👉 avinashwalton.github.io/SoloInvoice

Option 2 — Run Locally

git clone https://github.com/AvinashWalton/SoloInvoice.git
cd SoloInvoice
open index.html   # Just open in any browser — no build step needed!

No npm install. No build step. No dependencies. Single HTML file.

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📁 Project Structure

SoloInvoice/
├── index.html       # The entire app — HTML + CSS + JS in one file
├── README.md        # This file
└── LICENSE          # MIT License

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🛠️ Tech Stack

Tech	Usage
HTML5	Semantic structure, SEO meta tags, Open Graph
CSS3	Custom properties, Grid, Flexbox, animations
Vanilla JS	All logic — zero frameworks, zero dependencies
Browser Print API	Client-side PDF via print-to-PDF (no CDN needed)
localStorage	Invoice and business data persistence
FileReader API	Logo & signature image upload (base64)

Zero backend. Zero database. Zero cost.

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📸 How to Use

Step 1 — Set Up Your Business Profile

1. Click the Business tab
2. Enter your company name, tagline, email, phone, address, GSTIN, PAN
3. Upload your company logo (PNG/JPG/SVG)
4. Upload your handwritten signature image (PNG with transparent background works best)
5. Click Save Business Info — it auto-loads on every visit

Step 2 — Create an Invoice

1. Go to the Invoice tab
2. Fill in invoice number, date, due date
3. Add client name, email, address, GSTIN
4. Add line items with description, quantity, rate
5. Set currency, tax %, discount % as needed
6. Add bank/UPI payment details
7. Add notes and payment terms

Step 3 — Download / Print

• Download PDF Invoice → clean invoice window opens → select "Save as PDF" in print dialog → Save
• Print → same clean window opens directly for printing
• Save Invoice → saved to your browser's localStorage for future reference

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🖨️ PDF Download — How it Works

SoloInvoice uses the browser's native Print → Save as PDF instead of a third-party library. This means:

• ✅ Works 100% offline — no CDN required
• ✅ No html2pdf or jsPDF dependency
• ✅ Pixel-perfect A4 output with all colors preserved
• ✅ Works on Chrome, Firefox, Edge, Safari

When the print dialog opens:

1. Destination → select Save as PDF or Microsoft Print to PDF
2. Layout → Portrait
3. Click Save

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🗺️ Roadmap

• QR code for UPI payment on invoice
• Invoice email via mailto link
• Multiple invoice templates (Classic, Modern, Minimal)
• Dark mode
• CSV export of saved invoice list
• Recurring invoice support
• PWA / installable as offline app

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🤝 Contributing

Contributions are welcome!

• 🐛 Report bugs
• 💡 Request features
• 🔧 Submit pull requests — just edit index.html

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📄 License

MIT License — see LICENSE for details. Free to use, modify, and distribute.

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👨‍💻 Author

Avinash Walton

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🛠️ Other Tools by Avinash Walton

Tool	Description
FileFlux	File conversion and management
AuthorPro	Writing and authoring tool
DesiLang	Indian language utilities
TranscriptPro	Transcript and subtitle tool
PromptVault Pro	AI prompt library
SanitizeOS	System cleanup utility
PixelLocker	Image privacy & security tool

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Made with ❤️ in India  ·  Avinash Walton