iTextSharp

If you're a developer working with Java, .NET, Android, or Google App Engine and need to add PDF capabilities to your projects, iText is a go to library. For .NET users specifically, there's iTextSharp, which is the .NET version of the same powerful toolset.

iText is all about giving you control over PDFs whether you're creating them from scratch, tweaking existing ones, or digging into their structure. It’s designed to help you build dynamic documents, like reports that pull data straight from databases or XML files. You can even get creative with interactive elements, making everything from customized maps to full length eBooks with ease. Plus, it lets you jazz up your PDFs with stuff like bookmarks, page numbers, or watermarks, turning basic files into polished, professional documents.

Some of the standout features in iTextSharp include generating PDFs on the fly, manipulating them (like adding stamps or merging/splitting files), filling out interactive forms, working with XML data, and applying digital signatures for security.

All in all, iTextSharp packs a serious punch. It’s one of those tools that just works whether you’re breaking apart a multi page PDF, auto filling forms, or streaming customized PDFs directly to a user’s browser. If your app needs to handle PDFs, iTextSharp has pretty much every feature you could ask for.