Watermark Pro

文件水印工具，支持图片、Word、PPT、PDF添加水印。

功能特性

• - 🖼️ 图片水印：支持JPG/PNG/WEBP格式
• 📄 Word水印：支持.docx格式
• 📊 PPT水印：支持.pptx格式
• 📑 PDF水印：支持.pdf格式
• ✍️ 文字水印：自定义文字、字体、颜色
• 🖼️ Logo水印：支持透明PNG Logo
• 📍 多种布局：对角线/居中/平铺

触发条件

• - 加水印 / Add watermark
• 图片加水印 / Word文档加水印
• watermark-pro

第一步：图片水印

python
from PIL import Image, ImageDraw, ImageFont
import os

class ImageWatermark:
def addtextwatermark(self, imagepath, text, outputpath,
font_size=None, color=(128, 128, 128),
opacity=0.3, angle=-45, layout=diagonal, density=200):
img = Image.open(image_path).convert(RGBA)
width, height = img.size
watermark = Image.new(RGBA, img.size, (0, 0, 0, 0))
draw = ImageDraw.Draw(watermark)

if font_size is None:
font_size = max(width, height) // 30

try:
font = ImageFont.truetype(/System/Library/Fonts/PingFang.ttc, font_size)
except:
font = ImageFont.load_default()

alpha = int(255 * opacity)
fill_color = (*color, alpha)

if layout == diagonal:
for y in range(0, height, density):
for x in range(0, width, int(density * 1.4)):
draw.text((x, y), text, font=font, fill=fill_color)
elif layout == center:
bbox = draw.textbbox((0, 0), text, font=font)
tw = bbox[2] - bbox[0]
th = bbox[3] - bbox[1]
draw.text(((width-tw)//2, (height-th)//2), text, font=font, fill=fill_color)

watermark = watermark.rotate(angle, expand=False, resample=Image.BICUBIC)
result = Image.alpha_composite(img, watermark)

if output_path.lower().endswith(.jpg):
result = result.convert(RGB)
result.save(output_path)
return output_path

第二步：Word水印

python
from docx import Document
from docx.shared import Pt, RGBColor
from docx.enum.text import WDALIGNPARAGRAPH

class WordWatermark:
def addtextwatermark(self, docxpath, text, outputpath,
font_size=48, color=(200, 200, 200)):
doc = Document(docx_path)

for section in doc.sections:
header = section.header
header.islinkedto_previous = False

for para in header.paragraphs:
para.clear()

para = header.paragraphs[0] if header.paragraphs else header.add_paragraph()
para.alignment = WDALIGNPARAGRAPH.CENTER

run = para.add_run(text)
run.font.size = Pt(font_size)
run.font.color.rgb = RGBColor(*color)
run.font.name = 宋体

para.paragraphformat.spacebefore = Pt(250)

doc.save(output_path)
return output_path

第三步：PowerPoint水印

python
from pptx import Presentation
from pptx.util import Inches, Pt
from pptx.dml.color import RGBColor
from pptx.enum.text import PP_ALIGN

class PptWatermark:
def addtextwatermark(self, pptxpath, text, outputpath,
font_size=60, color=(200, 200, 200)):
prs = Presentation(pptx_path)

for slide in prs.slides:
txBox = slide.shapes.add_textbox(Inches(1.5), Inches(3), Inches(7), Inches(1.5))
tf = txBox.text_frame
p = tf.paragraphs[0]
p.text = text
p.font.size = Pt(font_size)
p.font.color.rgb = RGBColor(*color)
p.alignment = PP_ALIGN.CENTER

prs.save(output_path)
return output_path

第四步：PDF水印（图片叠加）

python
import fitz
from PIL import Image, ImageDraw, ImageFont
import os

class PdfWatermark:
def addtextwatermark(self, pdfpath, text, outputpath,
font_size=28, color=(128, 128, 128),
opacity=0.25, density=220):
doc = fitz.open(pdf_path)

for page in doc:
rect = page.rect
width, height = int(rect.width), int(rect.height)

wm_img = Image.new(RGBA, (width, height), (0, 0, 0, 0))
draw = ImageDraw.Draw(wm_img)

try:
font = ImageFont.truetype(/System/Library/Fonts/PingFang.ttc, font_size)
except:
font = ImageFont.load_default()

alpha = int(255 * opacity)
fill = (*color, alpha)

for y in range(0, height, density):
for x in range(0, width, int(density * 1.4)):
draw.text((x, y), text, font=font, fill=fill)

tempimg = os.path.join(os.path.dirname(outputpath), tempwm.png)
wmimg.save(tempimg)

page.insertimage(rect, filename=tempimg, overlay=True)

doc.save(output_path)
doc.close()

if os.path.exists(temp_img):
os.remove(temp_img)

return output_path

使用示例

用户：给图片加版权所有水印
助手：使用 ImageWatermark.addtextwatermark()

用户：Word文档加机密水印
助手：使用 WordWatermark.addtextwatermark()

用户：PDF加水印，密度高一点
助手：使用 PdfWatermark.addtextwatermark(density=150)

注意事项

• - 纯本地处理，无隐私风险
• 支持中英文水印
• 跨平台兼容