Generator Settings
Prefix
A short, stable prefix makes invoices instantly recognisable in bank statements and accounting exports.
Date format
Separator
Hyphen (-)
Slash (/)
Underscore (_)
Dot (.)
None
Starting number
Continuing an existing series? Enter your next unused number so the sequence stays unbroken.
Number length
3 digits — 001
4 digits — 0001
5 digits — 00001
6 digits — 000001
No padding
Preview format
INV-20260809-1001
How many to generate
Increment by
Invoice date
Used for any date segment in the format above.
Advanced format
Custom pattern
Click a token to insert it.
{SEQ}
is the running number,
{SEP}
your separator.
Suffix
Generate Invoice Numbers
Generated Results
4 generated
Results
Export
Validation
Legal rules
Regenerate
Invoice numbers must be
unique and sequential
in most tax jurisdictions. Record the last number you issue so the next batch continues from it.
Export format
Plain list
CSV with index
CSV single column
JSON array
SQL INSERT
Quoted & comma-separated
invoice-numbers.txt
Copy all
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