In today's software development landscape, PDF generation is a common requirement, enabling seamless document delivery and archiving across different platforms. Among the several libraries available for generating PDFs using C#, choosing the best one depends on factors such as ease of use, performance, licensing, and specific feature requirements. This article delves into some of the popular C# APIs for creating PDFs, exploring their features, and comparing them through a summarized table.

1. iTextSharp

Overview

iTextSharp is a popular C# library used for creating and manipulating PDF documents. It's a port of the Java library iText and provides comprehensive functionalities for PDF creation, including text, images, tables, forms, and custom annotations.

Features

• Rich Content Support: Add text, images, tables, headers, and footers.
• Template use: Generate PDFs based on pre-defined templates.
• Form Support: Fill out and manipulate forms.
• Digital Signatures: Add digital signatures for secure documents.

Example

• License: AGPL license - suitable for open-source projects but requires a commercial license for proprietary software.
• Complexity: Offers a rich set of features which can have a steep learning curve.
• Direct Drawing: Directly draw shapes, lines, and images on the PDF using standard .NET drawing techniques.
• Document Merging: Combine multiple PDF documents into one.
• Easy-to-Use API: Offers a more intuitive and simple interface.
• License: MIT license - much more permissive and generally free for commercial use.
• Feature Set: Lacks some advanced features like form creation.
• HTML to PDF: Convert HTML, including CSS and JS, directly to PDF.
• Razor Engine Support: Integrates with Razor templates for dynamic documents.
• Advanced Rendering: Support for complex layouts including charts and graphs.
• License: Commercial license required, but offers free development environment.
• Ease of Use: Highly user-friendly if you are familiar with HTML/CSS.