mPDF

mPDF is a PHP library that generates PDF files from HTML and CSS. It is typically used in server-side web applications to produce documents such as invoices, reports, labels, and form output without requiring a separate PDF application.

It is mainly used by PHP developers building document workflows into custom systems, CMS platforms, or business apps. A distinguishing trait is its focus on converting HTML/CSS directly within PHP, making it practical where PDF output needs to be created from templated web-style markup rather than assembled through low-level PDF drawing commands.