The PDFTK, FPDF, and FPDM libraries were used to update the existing fillable PDF file.

FPDI driver supports links annotations

Helper to create pdf using tcpdf & fpdi

a simple PHP script to add a watermark and border image to your PDF files using FPDI.

Extension of tFPDF via FPDI

Usage Java to convert PDF version to 1.4 for FPDI PDF-Parser (free license) without Ghostscript

Fill Acrobat forms easily using pure PHP ! 💪

A clone of FPDF with an almost compatible interface while using SetaPDF-Core internally for the PDF generation.

Merge PDF files

TYPO3 CMS extension that provides various Fluid ViewHelpers to generate PDF documents.

Simple and Agnostic PDF Document Parser in PHP - sign PDF docs using PHP

A FPDI PDF Wrapper for Laravel which includes the "merge" functionality

FPDI is a collection of PHP classes facilitating developers to read pages from existing PDF documents and use them as templates in FPDF.