Invoice Number Generator
Generate invoice numbers for your business. Use the sequential generator for ordered invoice series, or random codes for non-sequential numbering.
Frequently Asked Questions
Should invoice numbers be sequential?
Tax authorities in many countries require sequential invoice numbering. Use our Sequential Code Generator for compliant invoice series.
What format do most invoicing systems expect?
Most accounting software (Xero, QuickBooks, FreshBooks) accepts any alphanumeric format. A year-prefixed format like INV-2024-XXXX is common and makes filing easier. Avoid symbols that break CSV parsing.
Can I use random invoice numbers for a small business?
This depends on your jurisdiction. Many countries require sequential numbers without gaps. Check with your accountant — if random numbers are permitted, this generator produces unique codes ideal for informal invoicing.