Browser-based invoice, proforma, quote and receipt generator at invoice.bnj.app. The user fills in their own details and their client's details, adds line items, sets tax (exclusive / inclusive / none, single or per-line rates), discount, shipping and amount already paid, then downloads a vector PDF. All computation (tax arithmetic in integer minor units, layout, font embedding, PDF writing) happens in the browser; no invoice data is ever sent to a server. Free tier: unlimited invoices and lines, all 16 currencies, English and Turkish document languages, total in words — the PDF carries a faint "invoice.bnj.app" watermark and a "Made with invoice.bnj.app" footer line. Pro subscription (weekly $4.99 / monthly $14.99 / yearly $49.99, 24-hour free trial) removes the watermark and adds: own logo and accent colour, client and invoice archive, automatic number series, three layouts. No accounts, no passwords, no email: Pro is unlocked by a licence code of the form BNJ-XXXXXXXX which the user can enter on another device. Payments are processed by Stripe (not yet switched on at launch). IMPORTANT: this is NOT an e-invoicing service — it does not issue e-Fatura / e-Arşiv in Turkey or any other government-registered electronic invoice; it produces invoice documents (PDF files) only.