How to Create a Professional Invoice for Free (With Template)

Getting paid promptly starts with sending a clear, professional invoice. A poorly formatted or incomplete invoice creates confusion, delays payment, and looks unprofessional. This guide covers what every invoice must include, how to format it correctly, and how to generate a polished PDF invoice for free.

What must an invoice include?

• Your name or business name and contact information
• The client's name and contact information
• A unique invoice number for your records
• The invoice date and payment due date
• A clear description of each product or service provided
• The quantity and unit price for each line item
• Subtotal, any applicable taxes, discounts, and the total amount due
• Payment instructions (bank transfer details, PayPal, or other methods)
• Optional: your logo, payment terms, and a thank-you note

How to create a free invoice PDF

The fastest way to create a professional PDF invoice is to use the PDFanything Invoice Generator. It gives you a ready-to-use template where you fill in your details, add line items, set tax rates, and download the finished invoice as a PDF in seconds.

1. Go to pdfanything.com/invoice
2. Enter your business details and client information
3. Add line items with descriptions, quantities, and prices
4. Set a tax rate and any discounts if applicable
5. Click Download PDF to save your professional invoice

Invoice numbering: how to keep track

Use a consistent numbering system so you can refer to invoices easily. A simple format is INV-001, INV-002 and so on. If you work with multiple clients, prefix the number with a client code, for example ACME-001. Always increment the number for each new invoice and never reuse a number.

How to write payment terms that get you paid faster

Net 30 (payment due within 30 days) is standard in many industries, but for freelancers and small businesses, Net 14 or Net 7 is often more practical. You can also offer an early payment discount — for example, 2 percent off if paid within 5 days — to incentivise fast payment. Always state the due date explicitly, not just the terms, to avoid ambiguity.

What to do if an invoice is not paid

Send a polite reminder email one day after the due date referencing the invoice number and amount. If payment has not arrived within a week, follow up by phone. Most late payments are the result of the invoice being overlooked rather than a deliberate refusal to pay. Keep records of all communications in case you need to escalate to a collections process.