Free Invoice Number Generator
Every invoice needs a unique, sequential number — for your records and your client's. Generate a clean batch of invoice numbers with your own prefix and year format in one click.
INV-2026-001
INV-2026-002
INV-2026-003
INV-2026-004
INV-2026-005
INV-2026-006
INV-2026-007
INV-2026-008
INV-2026-009
INV-2026-010
How to use
- Set your prefix (e.g. INV) and year.
- Choose your starting number and how many you need.
- Copy the numbers and use them in order — never skip or reuse.
Frequently asked questions
Why must invoice numbers be sequential?
Gaps look suspicious to accountants and tax authorities. An unbroken sequence proves no invoice was deleted or hidden.
Can I use separate sequences per client?
You can, but one shared sequence is simpler and standard practice for most small businesses.
What format should invoice numbers use?
Prefix + year + zero-padded sequence (INV-2026-001) is clear, sortable, and professional.
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