一文详解如何使用Python向PDF精确添加文本

pip install spire.pdf.free

from spire.pdf import PdfDocument, PdfTrueTypeFont, PdfFontStyle, PdfSolidBrush, PdfRGBColor, PointF, RectangleF, \
    PdfStringFormat, PdfTextAlignment, PdfVerticalAlignment

# 创建新的PDF文档并添加页面
pdf = PdfDocument()
page = pdf.Pages.Add()

# 待插入的文本内容
text = ("The purpose of this document is to provide an overview of the company's financial highlights for the fiscal year 2024. "
        "It includes revenue trends, operational costs, and net income summaries. "
        "The following sections will outline each metric in more detail.")

# 设置字体、画刷（颜色）和排版区域
font = PdfTrueTypeFont("Arial", 14.0, PdfFontStyle.Regular, True)
brush = PdfSolidBrush(PdfRGBColor(0, 0, 0))  # 黑色文本
layout_area = RectangleF(50.0, 50.0, page.GetClientSize().Width - 100.0, page.GetClientSize().Height)
string_format = PdfStringFormat(PdfTextAlignment.Left, PdfVerticalAlignment.Top)

# 添加文字内容
page.Canvas.DrawString(text, font, brush, layout_area, string_format, False)

# 保存并关闭
pdf.SaveToFile("output/new.pdf")
pdf.Close()

from spire.pdf import PdfDocument, PdfFontStyle, PdfSolidBrush, PdfRGBColor, PointF, PdfFont, PdfFontFamily

# 加载已有PDF文档
pdf = PdfDocument()
pdf.LoadFromFile("PDF.pdf")
page = pdf.Pages[0]

# 设置字体、颜色和插入位置
font = PdfFont(PdfFontFamily.TimesRoman, 12.0, PdfFontStyle.Bold)
brush = PdfSolidBrush(PdfRGBColor(0, 128, 0))  # 深绿色
location = PointF(130.0, 90.0)

# 插入文本
page.Canvas.DrawString("Verified by QA Department", font, brush, location)

# 保存结果
pdf.SaveToFile("output/ModifiedPDF.pdf")
pdf.Close()

from spire.pdf import PdfDocument, PdfTrueTypeFont, PdfFontStyle, PdfSolidBrush, PdfRGBColor, PointF
from spire.pdf.common import Color

# 加载已有PDF文档
pdf = PdfDocument()
pdf.LoadFromFile("input1.pdf")
page = pdf.Pages[0]

# 设置水印文本内容
text = "Internal Use Only"

# 设置字体样式与大小
font = PdfTrueTypeFont("Arial", 40.0, PdfFontStyle.Bold, True)

# 设置画刷颜色为深红色
brush = PdfSolidBrush(PdfRGBColor(Color.get_DarkRed()))

# 测量文本大小以便居中放置
size = font.MeasureString(text)
x = (page.Canvas.ClientSize.Width - size.Width) / 2
y = (page.Canvas.ClientSize.Height - size.Height) / 2

# 保存当前画布状态
state = page.Canvas.Save()

# 设置透明度
page.Canvas.SetTransparency(0.3)

# 平移至文本中心位置
page.Canvas.TranslateTransform(x + size.Width / 2, y + size.Height / 2)

# 旋转文本（-45度斜着显示）
page.Canvas.RotateTransform(-45.0)

# 绘制文本水印（左上角为起始点，因此需偏移）
page.Canvas.DrawString(text, font, brush, PointF(-size.Width / 2, -size.Height / 2))

# 恢复画布状态
page.Canvas.Restore(state)

# 保存文档
pdf.SaveToFile("output/with_watermark.pdf")
pdf.Close()