Free Invoice Number Generator
Invoice Number Generator
Generate professional invoice numbers with sequential, date-based, or custom formats. Copy instantly or generate batches.
Number Format
Format Options
Add leading zeros for padding (001 → 002 → 003)
Generated Number
INV-2026-001
Generate Batch
Click "Generate 10" to create a batch of sequential numbers
Best Practices
- Use a consistent prefix (INV, FAC, REC) across all invoices
- Include the year to easily identify when invoices were created
- Use leading zeros (001) to keep numbers sortable
- Never reuse or skip invoice numbers for tax compliance
Automate Your Invoice Numbering
PayRequest automatically generates sequential invoice numbers, tracks payments, sends reminders, and handles all your billing — starting at just €5/month.