Holidays and Traditions Can an invoice just be an email? Can an invoice just be an email? Tips for how to write an invoice via email Don't paste your invoice into the body of the email. Instead, attach it as a downloadable PDF file. This enables your clients to save, print, or upload your invoice to their accounting software. Related Posts:How do I write a basic invoice?Is there a PDF editor in Chrome?How do I print an invoice from the Amazon App 2021?How do you change a PDF file name?