QuickInvoice – Free Invoice Generator

A pure static, privacy-first invoice generator. Fill in your business and client details, add line items, and download a professional PDF invoice (via the browser print dialog). Everything runs in the browser – no account, no server, no data upload.

Live URL: https://quickinvoice-tool.vercel.app (placeholder – replace after deploy)

Features

• Business + client details, optional logo upload (stored locally as a data URL)
• Auto-incrementing invoice numbers (INV-0001, INV-0002, …)
• Issue date (today) and due date (+14 days) defaults
• 10 currencies formatted with Intl.NumberFormat (USD, EUR, GBP, CAD, AUD, MXN, BRL, ARS, INR, JPY)
• Line items with qty × unit price, tax %, discount (% or fixed), shipping, notes / payment terms
• Live invoice preview with accent color picker – the preview is exactly what prints
• Download PDF / Print via window.print() with dedicated A4/Letter print CSS
• Copy share text (plain-text summary for email or chat)
• Autosave to localStorage, restore on reload, realistic sample data on first visit
• Save invoices to a local history (reload / delete)
• Dark + light theme

Pro (one-time, lifetime)

• Removes the "Generated with QuickInvoice" line on printed invoices
• Unlimited saved invoices (free: 3)
• 3 templates: Classic (free), Modern and Minimal (Pro)
• Lifetime updates

Gating lives in app.js and uses isPro() from monetize.js.

Monetization setup

All switches live in config.js:

1. Google AdSense – set ADSENSE_CLIENT to your publisher id (e.g. ca-pub-1234567890123456). The .ad-slot placeholders become real ad units automatically. Leave empty to show dashed placeholders.
2. Pro checkout – create a product on Lemon Squeezy, Gumroad or a Stripe Payment Link and paste the URL in PRO_CHECKOUT_URL. Set PRO_PRICE to the displayed price. After purchase the buyer pastes the license key from the email into the Pro modal (activateLicense in monetize.js – replace with real license validation, e.g. the Lemon Squeezy license API, before going live).
3. Google Analytics – set GA_ID (e.g. G-XXXXXXX). track() events fired: generate, download, print, copy, save_invoice, pro_click, begin_checkout.
4. Site URL – after the first deploy, replace the literal quickinvoice-tool.vercel.app in every file with your domain: grep -rl "quickinvoice-tool.vercel.app" . | xargs sed -i 's/quickinvoice-tool.vercel.app/yourdomain.com/g'

Run locally

npx serve .

Then open the printed URL (usually http://localhost:3000). No build step, no dependencies.

Deploy

Deploy the folder as-is to Vercel (vercel.json enables clean URLs so /privacy and /terms resolve).