5步压缩JPG转PDF到5MB内

合并多个JPG文件为PDF并压缩至5MB以内的方法

准备工作 确保电脑已安装Adobe Acrobat DC或其他PDF编辑软件（如Foxit PhantomPDF、Nitro PDF）。若需免费工具，可选用PDF24 Creator或Smallpdf在线工具（注意隐私敏感文件慎用）。

合并JPG为PDF 打开Adobe Acrobat DC，选择"创建PDF"→"从多个文件"。按提示添加所有JPG图片，调整顺序后点击"合并"。在输出设置中选择"高质量打印"（默认设置可能导致文件过大）。

使用命令行工具（需安装ImageMagick）：

convert *.jpg -quality 60 output.pdf

参数-quality 60可调节压缩质量，数值越低文件越小。

压缩PDF文件 在Adobe Acrobat DC中打开PDF，选择"文件"→"另存为其他"→"缩小大小的PDF"。或使用"优化PDF"功能，手动调整以下参数：

降低图像分辨率至150dpi
丢弃嵌入的非必要字体
启用JPEG2000压缩

使用Ghostscript命令行压缩：

gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/ebook -dNOPAUSE -dBATCH -sOutputFile=compressed.pdf input.pdf

其中/ebook参数可替换为：

/screen（72dpi，最小体积）
/ebook (150dpi)
/printer (300dpi)

验证与调整 检查输出文件是否清晰可读。若文件仍超5MB，可尝试：

使用在线工具PDF Compressor进行二次压缩
将JPG预先用Photoshop批量压缩至80%质量
拆分PDF为多个小于5MB的文件

注意事项 职称系统通常要求PDF为不可编辑状态，建议在Acrobat中设置"用密码加密"→限制编辑和打印。避免使用截图生成的PDF，文字类文件优先采用扫描仪生成可搜索文本的PDF。

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