Custom PDF InvoicesInvoice and quote PDF files use a customizable template file system in the templates directory of the active WHMCS system theme.
GeneralThe General tab in General Settings allows you to configure basic settings within WHMCS, like the company name, your logo, system URL and theme, maintenance mode, friendly URLs, and more.
Configure Email StylingYou can customize the styling for emails that WHMCS sends to your customers by configuring custom global email headers and footers.
Customize Your LogoYou can easily change the logo in emails, on generated invoices, and in the Client Area.