Free Editable/Printable HTML Invoice Template
CSS-Tricks, inspired from the succesful invoicing application Freshbooks, is sharing an editable/printable HTML invoice template.
The template uses textarea elements for the parts that display data which would make further improvements easier (like posting the form).
This invoice template can be useful for freelancers who send their own invoices or applications that send an invoice after a purchase.
There are also few other free HTML invoice templates you may want to check: