Generate sequential batches of structured invoice numbers using custom prefixes, date components, and starting sequences. This free, browser-based tool helps businesses establish a consistent, organized numbering system for their invoices — no sign-up or installation required. Configure your format, generate the batch, and print or save the list instantly.
The Invoice Number Generator is a free online utility that creates structured, sequential invoice numbers in bulk. You define a prefix (such as INV or BILL), a date component for chronological tracking, and a starting sequence number. The tool then generates a batch of consistently formatted numbers you can use across your invoicing workflow. Running entirely in your browser, it requires no account, no downloads, and stores nothing on a server. It is especially useful for businesses setting up a new numbering scheme or preparing a block of pre-assigned numbers for an upcoming billing cycle.
Enter a short prefix that identifies your invoice series — for example, INV for general invoices or PROJ for project-based billing. Select a date to embed a time component in each number. Set the starting sequence number and specify how many numbers to generate, up to 500 at a time. Click Generate Numbers and the tool instantly produces a formatted list. Each number follows the pattern PREFIX-DATE-SEQUENCE, ensuring consistency and easy sorting. You can print the list or save it as a PDF to keep as a reference for your accounts department.