Solution for editing and sending PDF invoices?

What would be the easiest solution to edit the design of a PDF invoice and send it to customers?

As I understand, editing the design in Magento is a bit too complicated.

I’m currently considering 2 options:

1. using third-party modules;
2. interating with Zoho Invoices (or similar service) where I can easily edit the design and send emails

It’s Magento 2.4.1.

Thanks!