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  When you share PDF files on the Internet, it`s important to convince the person on the other side of the screen that the published information is correct. After all, any file can be intercepted by attackers and make adjustments. A watermark PDF with your logo or a certain text will allow you to identify the authenticity of the file and prove its security for everyone to whom it will be sent. We will take a detailed look at the methods for applying watermark PDF in this article. This article will be divided into three parts that will outline how you can add text/image watermarks to PDF using C#/VB.NET code. To achieve this functionality, you just need to follow a few simple steps. Read on for more information. Programming Environment   In this test, Free Spire.PDF for .NET is introduced into the program. The Spire.PDF.dll file can be referenced by:   Method 1: Download Free Spire.PDF for .NET locally, unzip it, and install it. After the installation is complete...

  C#/VB.NET ： Convert HTML to PDF An HTML file is a web page document commonly saved with a filename extension .html or .htm. Because of PDF portability and compatibility, it offers many advantages to convert HTML content into PDF. Since PDF supports a wide range of image compression, it will give you the benefit of taking little storage on your hard drive even with so much data held on one file. Don’t worry because even with compressed data, your converted HTML documents to PDF still retains the original text and layouts of your web page. You can save and share your PDFs on any device or operating system while maintaining document content, layout, and quality. HTML can be converted to PDF in using QT Web plugin. This article will show you how to convert HTML to PDF with plugin.   Install Free Spire.PDF for .NET In this test, Free Spire.PDF for .NET is introduced into the program. The Spire.PDF.dll file can be referenced by:   Method 1: Download Free Spire....