部门工作需要给大量pdf文件加盖电子公章，于是参考chatgpt写了这个脚本

• 脚本使用必备：python环境（官网下载）后在cmd中运行py --version查看python环境情况
• 一些必备的库：PyPDF2 reportlab Pillow，win+r键打开运行，输入cmd并回车，在cmd中使用以下代码安装

pip install PyPDF2 reportlab Pillow

以下是代码正文

import os
from PyPDF2 import PdfReader, PdfWriter
from reportlab.pdfgen import canvas
from reportlab.lib.pagesizes import letter
from reportlab.lib import colors
from PIL import Image

def create_stamp_pdf(stamp_path, output_path, width=None, height=None, x=0, y=0):
    # 创建一个 PDF 文件
    c = canvas.Canvas(output_path, pagesize=letter)
    
    # 打开公章图像
    stamp_image = Image.open(stamp_path)
    
    # 如果没有指定宽度和高度，则使用图像的原始尺寸
    if width is None or height is None:
        width, height = stamp_image.size
    
    # 在 PDF 中绘制图像，保持透明背景
    c.drawImage(stamp_path, x, y, width=width, height=height, mask='auto')
    c.save()

def add_stamp_to_pdf(pdf_path, stamp_pdf_path, output_path):
    # 打开 PDF 文件
    pdf_reader = PdfReader(pdf_path)
    pdf_writer = PdfWriter()

    # 读取公章 PDF
    stamp_reader = PdfReader(stamp_pdf_path)
    stamp_page = stamp_reader.pages[0]

    # 遍历 PDF 的每一页
    for page in pdf_reader.pages:
        # 合并公章页面
        page.merge_page(stamp_page)

        # 将修改后的页面添加到写入器
        pdf_writer.add_page(page)

    # 写入输出 PDF
    with open(output_path, 'wb') as output_pdf:
        pdf_writer.write(output_pdf)

def process_pdfs_in_folder(folder_path, stamp_path, output_folder, stamp_width=None, stamp_height=None, stamp_x=0, stamp_y=0):
    if not os.path.exists(output_folder):
        os.makedirs(output_folder)

    # 创建临时公章 PDF
    stamp_pdf_path = "temp_stamp.pdf"
    create_stamp_pdf(stamp_path, stamp_pdf_path, stamp_width, stamp_height, stamp_x, stamp_y)

    for filename in os.listdir(folder_path):
        if filename.endswith('.pdf'):
            pdf_path = os.path.join(folder_path, filename)
            output_path = os.path.join(output_folder, f"stamped_{filename}")
            add_stamp_to_pdf(pdf_path, stamp_pdf_path, output_path)
            print(f"Processed: {filename}")

    # 删除临时公章 PDF 文件
    os.remove(stamp_pdf_path)

if __name__ == "__main__":
    folder_path = "C:/Users/ZTXD64/Desktop/docks"  # 替换为你的 PDF 文件夹路径
    stamp_path = "C:/Users/ZTXD64/Desktop/gongzhang/test.png"     # 替换为你的公章 PNG 文件路径
    output_folder = "C:/Users/ZTXD64/Desktop/done"   # 替换为输出文件夹路径
    stamp_width = 100  # 替换为你想要的公章宽度
    stamp_height = 100  # 替换为你想要的公章高度
    stamp_x = 400  # 替换为你想要的公章 X 位置
    stamp_y = 365  # 替换为你想要的公章 Y 位置

    process_pdfs_in_folder(folder_path, stamp_path, output_folder, stamp_width, stamp_height, stamp_x, stamp_y)

注：使用时最后几行的folder_path，stamp_path，output_folder，需要设置为为自己的文件目录