Invoice Number Generator
Generate a sequence of invoice numbers with any prefix.
Shown before the number, e.g. INV
Generated numbers
What this tool does
Pick a prefix, a starting number, and how many invoices you need. The generator produces a clean, copyable list — for example INV-001, INV-002, INV-003. Consistent numbering makes invoices easier to reference, file, and reconcile.
How to use it
- 1Enter a prefix such as INV or an abbreviation for your business.
- 2Set the starting number (usually 1) and how many numbers you need.
- 3Copy the generated list, or use it to pre-fill a batch of invoices.
Worked example
Prefix INV, starting at 1, count 5 → INV-001, INV-002, INV-003, INV-004, INV-005.
Frequently asked questions
Should invoice numbers restart every year?
Some businesses reset to 001 each year (INV-2026-001). Most tax authorities only require numbers to be unique and sequential; a yearly reset is fine as long as the sequence doesn't repeat within the same period.
Can I use letters in an invoice number?
Yes. Prefixes such as INV- or abbreviations per client (ACME-001) are common and help with filing. Just keep the sequence unique and traceable.
Do estimates need separate numbering?
It helps. Many businesses use a separate sequence such as EST-001 for quotes and INV-001 for invoices so the two document types never get confused.
Turn the result into a real invoice
Create a professional PDF from your numbers in under two minutes.
Create an invoice