ASP.Net GridView Export to PDF - Reduce Font Size

Hai,

I am using iTextSharp to convert my html page to pdf, It works perfectly.

But the size of the font is very big.

I am using the below code,

Response.ClearHeaders()
        Response.ContentType = "application/pdf"
        Response.AddHeader("content-disposition", String.Format("attachment; filename={0}.pdf", Me.psn.Text))
        Response.Cache.SetCacheability(HttpCacheability.NoCache)
        Dim sw As New StringWriter()
        Dim hw As New HtmlTextWriter(sw)
        Me.Page.RenderControl(hw)
        Dim sr As New StringReader(sw.ToString())
        Dim pdfDoc As New Document(iTextSharp.text.PageSize.A4, 5.0F, 5.0F, 10.0F, 0.0F)
        Dim htmlparser As New HTMLWorker(pdfDoc)
        PdfWriter.GetInstance(pdfDoc, Response.OutputStream)
        pdfDoc.Open()
        htmlparser.Parse(sr)
        pdfDoc.Close()
        Response.Write(pdfDoc)
        Response.End()

Plz help me to solve this task.

Thanks in advance.