PM> Install-Package Spire.PDF

using System.Drawing;
using Spire.Pdf;
using Spire.Pdf.Graphics;
using Spire.Pdf.Annotations;
using Spire.Pdf.Annotations.Appearance;
namespace AddDynamicStamp
{
    class Program
    {
        static void Main(string[] args)
        {
            // 創(chuàng)建 PdfDocument 對(duì)象
            PdfDocument doc = new PdfDocument();
            // 加載 PDF 文檔
            doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\input.pdf");
            // 獲取指定頁(yè)面
            PdfPageBase page = doc.Pages[1];
            // 創(chuàng)建 PdfTemplate 對(duì)象
            PdfTemplate template = new PdfTemplate(220, 50);
            // 創(chuàng)建兩種字體
            PdfTrueTypeFont font1 = new PdfTrueTypeFont(new Font("Elephant", 16f, FontStyle.Bold), true);
            PdfTrueTypeFont font2 = new PdfTrueTypeFont(new Font("Times New Roman", 10f, FontStyle.Bold), true);
            // 創(chuàng)建純色畫(huà)刷和漸變畫(huà)刷
            PdfSolidBrush solidBrush = new PdfSolidBrush(Color.Blue);
            RectangleF rectangle1 = new RectangleF(new PointF(0, 0), template.Size);
            PdfLinearGradientBrush linearGradientBrush = new PdfLinearGradientBrush(
                rectangle1,
                new PdfRGBColor(Color.White),
                new PdfRGBColor(Color.Blue),
                PdfLinearGradientMode.Horizontal);
            // 創(chuàng)建畫(huà)筆
            PdfPen pen = new PdfPen(solidBrush);
            // 創(chuàng)建圓角矩形路徑
            int CornerRadius = 10;
            PdfPath path = new PdfPath();
            path.AddArc(template.GetBounds().X,
                        template.GetBounds().Y,
                        CornerRadius,
                        CornerRadius,
                        180,
                        90);
            path.AddArc(template.GetBounds().X + template.Width - CornerRadius,
                        template.GetBounds().Y,
                        CornerRadius,
                        CornerRadius,
                        270,
                        90);
            path.AddArc(template.GetBounds().X + template.Width - CornerRadius,
                        template.GetBounds().Y + template.Height - CornerRadius,
                        CornerRadius,
                        CornerRadius,
                        0,
                        90);
            path.AddArc(template.GetBounds().X,
                        template.GetBounds().Y + template.Height - CornerRadius,
                        CornerRadius,
                        CornerRadius,
                        90,
                        90);
            path.AddLine(template.GetBounds().X,
                         template.GetBounds().Y + template.Height - CornerRadius,
                         template.GetBounds().X,
                         template.GetBounds().Y + CornerRadius / 2);
            // 在模板上繪制路徑
            template.Graphics.DrawPath(pen, path);
            template.Graphics.DrawPath(linearGradientBrush, path);
            // 在模板上繪制文本
            String string1 = "APPROVED\n";
            String string2 = "By Marketing Manager at " +
                             DateTime.Now.ToString("HH:mm, MMM dd, yyyy");
            template.Graphics.DrawString(string1,
                                         font1,
                                         solidBrush,
                                         new PointF(5, 5));
            template.Graphics.DrawString(string2,
                                         font2,
                                         solidBrush,
                                         new PointF(2, 28));
            // 創(chuàng)建橡皮章，并設(shè)置大小和位置
            RectangleF rectangle2 = new RectangleF(
                55,
                page.ActualSize.Height - 55 - 70,
                240,
                55);
            PdfRubberStampAnnotation stamp =
                new PdfRubberStampAnnotation(rectangle2);
            // 創(chuàng)建 PdfAppearance 對(duì)象，并將模板設(shè)置為其普通狀態(tài)外觀
            PdfAppearance apprearance = new PdfAppearance(stamp);
            apprearance.Normal = template;
            // 將外觀應(yīng)用到印章
            stamp.Appearance = apprearance;
            // 將印章注釋添加到頁(yè)面注釋集合
            page.Annotations.Add(stamp);
            // 保存文件
            doc.SaveToFile("DynamicStamp.pdf", FileFormat.PDF);
            // 釋放資源
            doc.Dispose();
        }
    }
}

using Spire.Pdf;
using Spire.Pdf.Annotations;
using Spire.Pdf.Annotations.Appearance;
using Spire.Pdf.Graphics;
using System.Drawing;
namespace AddImageStamp
{
    class Program
    {
        static void Main(string[] args)
        {
            // 創(chuàng)建 PdfDocument 對(duì)象
            PdfDocument doc = new PdfDocument();
            // 加載 PDF 文檔
            doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\input.pdf");
            // 獲取指定頁(yè)面
            PdfPageBase page = doc.Pages[1];
            // 加載圖片文件
            PdfImage image = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\confidential.png");
            // 獲取圖片的寬度和高度
            int width = image.Width;
            int height = image.Height;
            // 根據(jù)圖片大小創(chuàng)建 PdfTemplate 對(duì)象
            PdfTemplate template = new PdfTemplate(width, height, true);
            // 在模板上繪制圖片
            template.Graphics.DrawImage(image, 0, 0, width, height);
            // 創(chuàng)建橡皮章注釋?zhuān)⒃O(shè)置其位置和大小
            RectangleF rect = new RectangleF(
                page.ActualSize.Width - width - 50,
                page.ActualSize.Height - height - 50,
                width,
                height);
            PdfRubberStampAnnotation stamp =
                new PdfRubberStampAnnotation(rect);
            // 創(chuàng)建 PdfAppearance 對(duì)象
            PdfAppearance pdfAppearance = new PdfAppearance(stamp);
            // 將模板設(shè)置為外觀的普通狀態(tài)
            pdfAppearance.Normal = template;
            // 將外觀應(yīng)用到印章
            stamp.Appearance = pdfAppearance;
            // 將印章注釋添加到 PDF
            page.Annotations.Add(stamp);
            // 保存文件
            doc.SaveToFile("ImageStamp.pdf");
            // 釋放資源
            doc.Dispose();
        }
    }
}

using Aspose.Pdf;
using Aspose.Pdf.Text;
class Program
{
    static void Main(string[] args)
    {
        const string dataDir = "YOUR DOCUMENT DIRECTORY";
        // 1. 加載文檔
        Document pdfDocument = new Document(dataDir + "AddImageStamp.pdf");
        // 2. 創(chuàng)建基于圖片的印章對(duì)象
        ImageStamp imageStamp = new ImageStamp(dataDir + "aspose-logo.jpg");
        imageStamp.Background = true;   // 設(shè)為背景印章
        imageStamp.XIndent = 100;       // 左邊距
        imageStamp.YIndent = 100;       // 上邊距
        imageStamp.Height = 300;        // 高度
        imageStamp.Width = 300;         // 寬度
        imageStamp.Rotate = Rotation.on270; // 旋轉(zhuǎn)角度
        imageStamp.Opacity = 0.5;       // 透明度 (0.5 = 50%)
        // 3. 將印章添加到第一頁(yè)
        pdfDocument.Pages[1].AddStamp(imageStamp);
        // 4. 保存文檔
        pdfDocument.Save(dataDir + "AddImageStamp_out.pdf");
    }
}

using Aspose.Pdf.Facades;
class Program
{
    static void Main(string[] args)
    {
        // 1. 創(chuàng)建 PdfFileStamp 對(duì)象并綁定 PDF 文檔
        PdfFileStamp fileStamp = new PdfFileStamp();
        fileStamp.BindPdf("YOUR_DOCUMENT_DIRECTORY/AddImageStampAll.pdf");
        // 2. 創(chuàng)建并配置 Stamp 對(duì)象
        Aspose.Pdf.Facades.Stamp stamp = new Aspose.Pdf.Facades.Stamp();
        stamp.BindImage("YOUR_DOCUMENT_DIRECTORY/aspose-logo.jpg");
        stamp.SetOrigin(200, 200);   // 設(shè)置位置（X, Y 坐標(biāo)）
        stamp.Rotation = 90.0F;      // 設(shè)置旋轉(zhuǎn)角度
        stamp.IsBackground = true;   // 設(shè)置為背景
        // 3. 將配置好的 Stamp 添加到文檔的所有頁(yè)面
        fileStamp.AddStamp(stamp);
        // 4. 保存并關(guān)閉
        fileStamp.Save("YOUR_OUTPUT_DIRECTORY/AddImageStampAll_out.pdf");
        fileStamp.Close();
    }
}

using Spire.Pdf;
using Spire.Pdf.Graphics;
using System.Drawing;
class Program
{
    static void Main(string[] args)
    {
        // 1. 加載文檔
        PdfDocument doc = new PdfDocument();
        doc.LoadFromFile("sample.pdf");
        // 2. 獲取第一頁(yè)及頁(yè)面尺寸
        PdfPageBase page = doc.Pages[0];
        System.Drawing.SizeF pageSize = page.Size;
        // 3. 創(chuàng)建模板并綁定到頁(yè)面
        PdfPageTemplate template = new PdfPageTemplate();
        template.Size = new SizeF(200, 60);
        template.Bounds = new RectangleF(50, pageSize.Height - 60, 200, 60); // 左下角
        page.AddTemplate(template);
        // 4. 在模板上繪制文本（來(lái)客訪案例）
        using (PdfTrueTypeFont font = new PdfTrueTypeFont(new Font("宋體", 12)))
        {
            template.Graphics.DrawString("申請(qǐng)人：張三", font, PdfBrushes.Black, new PointF(10, 15));
            template.Graphics.DrawString("日期：2026-05-08", font, PdfBrushes.Black, new PointF(10, 35));
        }
        doc.SaveToFile("result.pdf");
        doc.Close();
    }
}