The easiest way to make an invoice in Word is to use a template. Read on to learn how to make an invoice in Word and securely e-sign it to get paid on time. Some people still prefer to use Word documents to send and receive files, such as invoices. PDF is the standard business document format - but not everyone is on board with it. Learn how to use templates, create original invoices, and e-sign Word documents. Create a professional invoice directly in Word.