TCPDF

TCPDF is an open-source PHP library for generating PDF documents directly from application code. It is used by PHP developers and web application teams that need server-side PDF output for invoices, reports, labels, forms, or archived documents without relying on external PDF software.

The library can render text, tables, images, barcodes, and basic HTML/CSS into PDFs, and it supports headers, footers, page breaks, and document metadata. A distinguishing trait is that it is implemented in pure PHP, so it can be deployed in typical PHP environments without requiring additional binary dependencies.