Where does VirtualPaperLayoutManager1 live in the IronPDF API?

VirtualPaperLayoutManager1 is a class in the IronPdf.Engines.Chrome namespace, shipped in IronPdf.dll. It derives from Object and is accessed through IronPDF's Chrome rendering engine configuration pipeline.

How do you apply a responsive CSS layout when rendering HTML to PDF in C#?

Call UseResponsiveCssRendering on a VirtualPaperLayoutManager1 instance, passing the desired ViewPortWidth in pixels (default 1280). This causes Chrome to evaluate media queries at that viewport width before the PDF snapshot is taken, ensuring responsive layouts render at the correct breakpoint.

Class VirtualPaperLayoutManager1

Inheritance

System.Object

VirtualPaperLayoutManager1

Namespace: IronPdf.Engines.Chrome

Assembly: IronPdf.dll

Syntax

public class VirtualPaperLayoutManager1 : Object

Controlling how Chrome's rendering engine maps HTML content onto a virtual page is the job of VirtualPaperLayoutManager1. Before IronPDF converts a web page or HTML string to PDF, this object lets you pick the exact layout strategy that matches the content type: fixed-width continuous rolls, responsive breakpoints, scaled zoom, or standard Chrome defaults.

Five mutually exclusive methods define the available strategies. UseChromeDefaultRendering applies Chrome's built-in page layout without modification, a reliable baseline for most print-ready HTML. UseContinuousFeedRendering targets receipt-style or long-form output, accepting a width (default 80) and a margin (default 5) to produce a single unbroken column rather than paginated sheets. UseFitToPageRendering scales content to fill the page width, with a MinimumPixelWidth guard (default 1) that prevents content from collapsing below a usable size. UseResponsiveCssRendering sets a viewport width (default 1280 pixels) so that responsive CSS breakpoints fire correctly before the PDF snapshot is taken, which is particularly useful for dashboards and media-query-heavy layouts. UseScaledRendering applies a percentage zoom (default 100) to the entire page, giving precise control over content density when the source HTML renders too large or too small at its natural size.

Each call replaces the previous selection, so only the last method called before rendering takes effect. The class lives in IronPdf.Engines.Chrome and is part of the Chrome engine pipeline exposed by IronPDF's rendering configuration surface.

using IronPdf;

var renderer = new ChromePdfRenderer();
renderer.RenderingOptions.VirtualPaperLayoutManager
    .UseResponsiveCssRendering(ViewPortWidth: 1440);

renderer.RenderHtmlAsPdf("<h1>Report</h1>").SaveAs("report.pdf");

For a broader look at rendering options, see the IronPDF HTML to PDF how-to and the custom paper size examples.

Methods

UseChromeDefaultRendering()

Declaration

public void UseChromeDefaultRendering()

UseContinuousFeedRendering(Double, Int32)

Declaration

public void UseContinuousFeedRendering(double width = 80, int margin = 5)

Parameters

Type	Name	Description
System.Double	width
System.Int32	margin

UseFitToPageRendering(Int32)

Declaration

public void UseFitToPageRendering(int MinimumPixelWidth = 1)

Parameters

Type	Name	Description
System.Int32	MinimumPixelWidth

UseResponsiveCssRendering(Int32)

Declaration

public void UseResponsiveCssRendering(int ViewPortWidth = 1280)

Parameters

Type	Name	Description
System.Int32	ViewPortWidth

UseScaledRendering(Int32)

Declaration

public void UseScaledRendering(int ZoomPercentage = 100)

Parameters

Type	Name	Description
System.Int32	ZoomPercentage