Invoice Number Generator

How to use this tool

1. 1Set the Prefix, Separator, Number digits, and Starting number.
2. 2Toggle 'Include year' and 'Include month' checkboxes.
3. 3Set 'How many to generate' (1-100) and click Generate.
4. 4Copy individual numbers or click 'Copy all' for all as newline-separated text.

About Invoice Number Generator

Consistent invoice numbering is important for accounting, tax compliance, and client communication. This generator builds invoice numbers by joining configurable parts with a separator: Prefix (e.g. INV), optional current year (e.g. 2025), optional current month (e.g. 01), and a zero-padded sequence number. The separator can be -, /, _, or .. Set the number of digits for zero-padding (1-10), the starting number, and how many to generate (1-100). For example, with prefix INV, separator -, year on, month on, 4 digits, starting at 1, the output is INV-2025-01-0001, INV-2025-01-0002, etc. Each number has its own Copy button; a 'Copy all' button copies all as newline-separated text. Freelancers setting up invoice sequences, accountants generating batch invoice numbers, and small businesses standardising their numbering format are the primary users.

Frequently asked questions