How to convert and view HTML files with user defined margins

Introduction

When you are converting HTML files, you can ajdust top/bottom, left/right page margins in final document. The units of margins are typography points. Default values are: Top/Bottom - 72 Left/Right - 5

Final margin value is calculated as: Final margin value = [HTML page margin value] + [margin value in viewer ]

How to set margins values

Setting margins values when converting to PNG

To set margins values when converting HTML files to PNG with GroupDocs.Viewer for Java use following code:

    try (Viewer viewer = new Viewer("sample.htm")) {
       PngViewOptions options = new PngViewOptions("result_page_{0}.png");
       options.getWordProcessingOptions().setLeftMargin(40);
       options.getWordProcessingOptions().setRightMargin(40);
       options.getWordProcessingOptions().setTopMargin(40);
       options.getWordProcessingOptions().setBottomMargin(40);

       viewer.view(options);
    }

The following screenshot shows the output PNG file opened in a Windows Photo Viewer application.

Setting margins values when converting to JPG

To set margins values when converting HTML files to PNG with GroupDocs.Viewer for Java use following code:

    try (Viewer viewer = new Viewer("sample.htm")) {
       JpgViewOptions options = new JpgViewOptions("result_page_{0}.jpg");
       options.getWordProcessingOptions().setLeftMargin(40);
       options.getWordProcessingOptions().setRightMargin(40);
       options.getWordProcessingOptions().setTopMargin(40);
       options.getWordProcessingOptions().setBottomMargin(40);

       viewer.view(options);
    }

The following screenshot shows the output JPEG file opened in a Windows Photo Viewer application.

Setting margins values when converting to PDF

To set margins values when converting HTML files to PDF with GroupDocs.Viewer for Java use following code:

    try (Viewer viewer = new Viewer("sample.htm")) {
       PdfViewOptions options = new PdfViewOptions("result.pdf");
       options.getWordProcessingOptions().setLeftMargin(40);
       options.getWordProcessingOptions().setRightMargin(40);
       options.getWordProcessingOptions().setTopMargin(40);
       options.getWordProcessingOptions().setBottomMargin(40);

       viewer.view(options);
    }

The following screenshot shows the output PDF file opened in an Acrobat Reader.

More resources

GitHub Examples

You may easily run the code above and see the feature in action in our GitHub examples:

• GroupDocs.Viewer for Java examples, plugins, and showcase
• Document Viewer for .NET App WebForms UI Modern Example
• Document Viewer for Java App Dropwizard UI Modern Example
• Document Viewer for Java Spring UI Example
• GroupDocs.Viewer for .NET samples, plugins and showcase
• Document Viewer for .NET MVC UI Example 

Free Online App

Along with full-featured Java library we provide simple but powerful free Apps. You are welcome to view Word, PDF, Excel, PowerPoint documents with free to use online GroupDocs Viewer App.