Convert HTML to SVG

EVO HTML to PDF Converter for .NET Documentation

EVO HTML to PDF Converter also allows you to easily convert in just a few lines of code HTML pages and HTML strings to vector images in SVG format. In this section you can learn about the basic settings of the converter.

You can choose the HTML document to convert which can be:

A HTML page from a given URL. The URL must be accessible from the computer where the converter runs. If the page requires authentication or if you are using a proxy server to access Internet then you have to set the converter properties accordingly as described in documentation. The method you can use in this case is HtmlToSvgConverterConvertUrl(String)
A HTML string. When you convert a HTML string you also have the option to specify a base URL that will be used by converter to resolve the relative URLs found in the HTML string to fully qualified URLs. If your HTML string uses only fully qualified URLs then this parameter is not necessary The method you can use in this case is HtmlToSvgConverterConvertHtml(String, String)

The basic options you can set are grouped in a few categories.

HTML Viewer Options

HTML Viewer Width. This option is the equivalent in converter of the browser window width. The property you can set in your code to control the browser window width is HtmlToSvgConverterHtmlViewerWidth. When the browser window width is changed the HTML content displayed inside the window can have a different layout and something similar happens when you change the HTML Viewer width of the converter. At a given viewer width, the converter will capture by default the whole height of the HTML content, but you can set the HTML Viewer height to capture only the top part of the HTML page
HTML Viewer Height. This option is the equivalent in converter of the browser window height and can be used to limit the conversion to the top part of the HTML page. If this property is not set the entire page will be converted. The property you can set in your code to control the browser window height is HtmlToSvgConverterHtmlViewerHeight

Navigation Options

Navigation Timeout. This option represents the maximum time to wait for a web page to be loaded by converter. If the web page cannot be loaded in this time interval the converter will throw an exception. The property you can set in your code for this option is HtmlToSvgConverterNavigationTimeout.
Delay Conversion. This option represents an additional time to wait after the HTML page was loaded to allow the asynchronous operations to finish before starting to capture the HTML content. If you cannot estimate the additional time to wait then you have the option to manually trigger the conversion. The property you can set in your code for this option is HtmlToSvgConverterConversionDelay.

Code Sample - Convert HTML to SVG

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protected void convertToSvgButton_Click(object sender, EventArgs e)
{
    // Create a HTML to SVG converter object with default settings
    HtmlToSvgConverter htmlToSvgConverter = new HtmlToSvgConverter();

    // Set license key received after purchase to use the converter in licensed mode
    // Leave it not set to use the converter in demo mode
    htmlToSvgConverter.LicenseKey = "4W9+bn19bn5ue2B+bn1/YH98YHd3d3c=";

    // Set HTML Viewer width in pixels which is the equivalent in converter of the browser window width
    htmlToSvgConverter.HtmlViewerWidth = int.Parse(htmlViewerWidthTextBox.Text);

    // Set HTML viewer height in pixels to convert the top part of a HTML page 
    // Leave it not set to convert the entire HTML
    if (htmlViewerHeightTextBox.Text.Length > 0)
        htmlToSvgConverter.HtmlViewerHeight = int.Parse(htmlViewerHeightTextBox.Text);

    // Set the maximum time in seconds to wait for HTML page to be loaded 
    // Leave it not set for a default 60 seconds maximum wait time
    htmlToSvgConverter.NavigationTimeout = int.Parse(navigationTimeoutTextBox.Text);

    // Set an adddional delay in seconds to wait for JavaScript or AJAX calls after page load completed
    // Set this property to 0 if you don't need to wait for such asynchcronous operations to finish
    if (conversionDelayTextBox.Text.Length > 0)
        htmlToSvgConverter.ConversionDelay = int.Parse(conversionDelayTextBox.Text);

    // The buffer to receive the generated SVG document
    byte[] outSvgBuffer = null;

    if (convertUrlRadioButton.Checked)
    {
        string url = urlTextBox.Text;

        // Convert the HTML page given by an URL to a SVG document in a memory buffer
        outSvgBuffer = htmlToSvgConverter.ConvertUrl(url);
    }
    else
    {
        string htmlString = htmlStringTextBox.Text;
        string baseUrl = baseUrlTextBox.Text;

        // Convert a HTML string with a base URL to a SVG document in a memory buffer
        outSvgBuffer = htmlToSvgConverter.ConvertHtml(htmlString, baseUrl);
    }

    // Send the SVG as response to browser

    // Set response content type
    Response.AddHeader("Content-Type", "image/svg+xml");

    // Instruct the browser to open the SVG file as an attachment or inline
    Response.AddHeader("Content-Disposition", String.Format("attachment; filename=HTML_to_SVG.svg; size={0}", outSvgBuffer.Length.ToString()));

    // Write the SVG document buffer to HTTP response
    Response.BinaryWrite(outSvgBuffer);

    // End the HTTP response and stop the current page processing
    Response.End();
}

Protected Sub convertToSvgButton_Click(ByVal sender As Object, ByVal e As EventArgs)
    ' Create a HTML to SVG converter object with default settings
    Dim htmlToSvgConverter As New HtmlToSvgConverter()

    ' Set license key received after purchase to use the converter in licensed mode
    ' Leave it not set to use the converter in demo mode
    htmlToSvgConverter.LicenseKey = "4W9+bn19bn5ue2B+bn1/YH98YHd3d3c="

    ' Set HTML Viewer width in pixels which is the equivalent in converter of the browser window width
    htmlToSvgConverter.HtmlViewerWidth = Integer.Parse(htmlViewerWidthTextBox.Text)

    ' Set HTML viewer height in pixels to convert the top part of a HTML page 
    ' Leave it not set to convert the entire HTML
    If htmlViewerHeightTextBox.Text.Length > 0 Then
        htmlToSvgConverter.HtmlViewerHeight = Integer.Parse(htmlViewerHeightTextBox.Text)
    End If

    ' Set the maximum time in seconds to wait for HTML page to be loaded 
    ' Leave it not set for a default 60 seconds maximum wait time
    htmlToSvgConverter.NavigationTimeout = Integer.Parse(navigationTimeoutTextBox.Text)

    ' Set an adddional delay in seconds to wait for JavaScript or AJAX calls after page load completed
    ' Set this property to 0 if you don't need to wait for such asynchcronous operations to finish
    If conversionDelayTextBox.Text.Length > 0 Then
        htmlToSvgConverter.ConversionDelay = Integer.Parse(conversionDelayTextBox.Text)
    End If

    ' The buffer to receive the generated SVG document
    Dim outSvgBuffer() As Byte = Nothing

    If convertUrlRadioButton.Checked Then
        Dim url As String = urlTextBox.Text

        ' Convert the HTML page given by an URL to a SVG document in a memory buffer
        outSvgBuffer = htmlToSvgConverter.ConvertUrl(url)
    Else
        Dim htmlString As String = htmlStringTextBox.Text
        Dim baseUrl As String = baseUrlTextBox.Text

        ' Convert a HTML string with a base URL to a SVG document in a memory buffer
        outSvgBuffer = htmlToSvgConverter.ConvertHtml(htmlString, baseUrl)
    End If

    ' Send the SVG as response to browser

    ' Set response content type
    Response.AddHeader("Content-Type", "image/svg+xml")

    ' Instruct the browser to open the SVG file as an attachment or inline
    Response.AddHeader("Content-Disposition", String.Format("attachment; filename=HTML_to_SVG.svg; size={0}", outSvgBuffer.Length.ToString()))

    ' Write the SVG document buffer to HTTP response
    Response.BinaryWrite(outSvgBuffer)

    ' End the HTTP response and stop the current page processing
    Response.End()
End Sub