Set your prefix (INV-2026, or whatever works), click to generate the next sequential number, copy it in one click, and track your invoice history. Multiple series supported. Runs in your browser, nothing uploaded.
Sequential invoice numbers are required for tax purposes in most countries, and they make it easy to track which invoices have been paid, reference a specific document in correspondence, and spot gaps if a number is skipped. The problem is remembering where you left off and keeping a consistent format — especially when you bill multiple clients or run separate series for retainers and project work.
This generator stores your prefix and counter in your browser. Click "Generate next number" and it shows the next one — ready to copy into InvoicePro or wherever you create your invoices. Nothing is uploaded, the counter persists between sessions, and you can run up to 3 named series simultaneously.
Set your format: INV, 2026-INV, client-INV, or anything that works for your business.
Each click generates the next number — no manual tracking, no skipped numbers.
Copy the number straight to your clipboard to paste wherever you need it.
Keeps the last 20 generated numbers with the date, so you can trace any invoice back.
Up to 3 named series with separate prefixes and counters.
Everything stored locally — your invoice history never leaves your browser.
Generate the number here, then build the invoice in InvoicePro. Lock the scope in a contract before the work starts. All offline, all free or one-time purchase.
One click, one number. Free, no account, nothing uploaded.