Design your own invoice numbering format and generate sequential numbers that pick up where you left off.
Our Invoice Number Generator lets you design your own invoice numbering format and generate sequential numbers — completely free, right in your browser. Unlike a one-off random number, this tool remembers where you left off between visits, so every number you generate is guaranteed to follow the last one, with no accidental duplicates or gaps.
| Format | Example | Good for |
|---|---|---|
| Prefix + Sequence | INV-0001 | Simple, small businesses |
| Prefix + Year + Sequence | INV-2026-0001 | Resetting numbering each year |
| Prefix + Year + Month + Sequence | INV-2026-08-0001 | High-volume monthly invoicing |
| Prefix + Sequence + Suffix | INV-0001-US | Businesses invoicing multiple regions |
Yes, completely free with no sign-up required. Generate as many numbers as you need.
Yes, your format settings, current counter position, and generation history are all saved to your browser's local storage automatically, so you can pick up exactly where you left off.
Yes, enter how many you need in the Batch Count field and click "Generate Batch" — useful for reserving a block of numbers ahead of time, for example for a printed invoice pad.
No. Everything — your format settings, counter, and history — is processed and stored entirely in your browser using local storage. Nothing is sent to our servers.
Yes — generate a number here, then paste it into the Invoice Number field on our Invoice Generator when creating your invoice.