Invoice Number Generator
Generate clean, sequential invoice numbers for your business. Set a prefix, a starting number and the date format, then copy the list or download it as a CSV file for your records.
Number settings
Example: INV-, BILL-, 2026/
Dates start from today. Use 0 for the same date on all rows.
Maximum 500 numbers per batch.
How to use
- Enter the prefix you want on your invoices, for example INV- or BILL/.
- Set the starting number and choose how many digits the number part should show.
- Pick a date format. Dates start from today and move forward by the number of days you set.
- Press Generate numbers, then use Copy all to paste the list anywhere, or Download CSV to save it.
Tips
- Never reuse an invoice number. Keep the next starting number in a safe place for the following batch.
- A yearly prefix such as 2026- helps you find old invoices quickly during audits.
- If you invoice clients in different series, generate a separate batch for each prefix.
- Zero padding (INV-0001 instead of INV-1) keeps the list sorted correctly in spreadsheets.