5MB以内JPG转PDF终极压缩技巧

合并多个JPG为PDF并压缩至5MB以内的方法

使用Adobe Acrobat合并与压缩

打开Adobe Acrobat DC，选择“工具”>“创建PDF”>“多个文件”。添加需要合并的JPG图片，调整顺序后点击“合并”。
完成合并后，选择“文件”>“另存为其他”>“减小大小的PDF”或使用“优化PDF”功能调整压缩级别，确保文件大小在5MB以内。

使用在线工具Smallpdf

访问Smallpdf官网，选择“JPG转PDF”功能上传多个JPG文件，调整页面顺序后生成PDF。
返回工具首页选择“压缩PDF”，拖入文件后选择“基本压缩”模式，下载前检查文件大小是否符合要求。

通过Python脚本自动化处理

安装PyPDF2和Pillow库，使用以下代码合并JPG并压缩PDF：

from PIL import Image
import os

# 合并JPG为PDF
images = [Image.open(f) for f in sorted(os.listdir()) if f.endswith('.jpg')]
images[0].save("output.pdf", save_all=True, append_images=images[1:])

# 压缩PDF（需安装Ghostscript）
os.system("gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/ebook -dNOPAUSE -dBATCH -dQUIET -sOutputFile=compressed.pdf output.pdf")

使用PDF24 Tools离线软件

下载PDF24 Creator，拖入JPG文件后右键选择“转换为PDF”。点击“优化PDF”图标，选择“压缩”选项，手动调整分辨率或删除冗余数据以减小体积。

注意事项

合并前检查JPG图片的分辨率，过高分辨率会导致PDF过大，建议提前用画图工具调整至150-300dpi。
压缩时优先选择“低精度”或“网页优化”模式，平衡清晰度与文件大小。

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