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Open‑source Java library for creating, editing, and extracting content from PDFs. Supports encryption, digital signatures, and form handling.
#3 PDFTron SDK
Cross‑platform PDF toolkit (Java, .NET, C++, Web) with high‑performance rendering, annotation, conversion, and OCR capabilities.
Commercial library offering PDF creation, conversion, manipulation, and form filling with extensive API coverage.
#5 PDFJet
Java and .NET library for fast PDF generation, supporting tables, charts, barcodes, and Unicode fonts.
#6 wkhtmltopdf
Command‑line tool that converts HTML/CSS to PDF using the WebKit rendering engine; works on Windows, Linux, and macOS.
#7 PrinceXML
High‑quality HTML‑to‑PDF converter with CSS support, ideal for complex layouts, invoices, and reports.
#8 DocRaptor
Cloud‑based API that turns HTML + CSS into PDF or Excel, with support for Java, .NET, Ruby, Python, and more.
Node.js wrapper around wkhtmltopdf for easy PDF generation from HTML with a simple JavaScript API.
#10 Flying Saucer
Java library that renders XHTML + CSS to PDF using iText under the hood, but provides a higher‑level API for layout.
Feature‑rich .NET library for creating, editing, and securing PDFs, with support for forms, tables, and barcode generation.
#12 Gnostice PDFOne
Commercial .NET component for PDF creation, conversion, and manipulation, including digital signatures and OCR.
#13 PDFreactor
Enterprise‑grade HTML‑to‑PDF converter with CSS3, JavaScript, and SVG support; available for Java and .NET.
#14 DynamicPDF
Java and .NET SDK for building PDFs programmatically, with strong support for forms, barcodes, and digital signatures.
#15 PDFium
Open‑source PDF rendering engine (used by Chrome) with bindings for C++, Java, and .NET; can be used for generation via low‑level APIs.
#16 PDFClown
Open‑source PDF library for Java and .NET offering creation, modification, and extraction capabilities.
#17 TallPDF
Java library focused on high‑performance PDF generation, supporting tables, images, and Unicode fonts.
#18 iTextSharp (C#)
The .NET port of iText, providing the same powerful PDF generation features for C# developers.
#19 PDFSharp
Open‑source .NET library for creating and processing PDF documents; works well for simple reports and graphics.
#20 Prawn (Ruby)
Pure Ruby PDF generation library offering a clean DSL for building complex PDFs, tables, and graphics.
#21 WeasyPrint
Python library that converts HTML/CSS to PDF using the Cairo graphics library; great for server‑side PDF generation.