当您的文档本质上主要是纯文本时，.docx和.pdf版本的文件大小在保存时应该相当相似，但情况并非总是如此。今天的超级用户问答帖子回答了一位好奇的读者关于文件大小差异很大的问题。

今天的问答环节是由SuperUser提供的，SuperUser是Stack Exchange的一个分支，是一个由社区驱动的问答网站分组。

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问题

超级用户读者Borek想知道为什么Microsoft Word生成的PDF文件如此之大：

I created a simple Microsoft Word document containing just this sentence, nothing else:

• This is a **all document.

Then I saved the document as .docx and .pdf files. Here are the file sizes:

• .docx: 12 kB
• .pdf: 89 kB

The difference between the two files is huge (technically) and it really bothers me when documents that are mostly textual in nature are just tens of kB in .docx format, but are hundreds of kB in size when converted to PDF files. What is so inefficient about the PDF format? Is it just Microsoft Word using some terrible output algorithm?

By the way, the PDF output settings on my Microsoft Office installation are set to create the **allest files possible:

为什么microsoftword生成的PDF文件这么大？

答案

超级用户贡献者rene为我们提供了答案：

If you open the PDF file in Notepad++, you will find:

And that object is referenced here at the end in the /FontFile2 instruction:

The fonts used by a Microsoft Word document are embedded into PDF files so that they are self-contained. I used this slide-deck from Adobe to decipher the PDF instructi***.

If you want to prevent fonts from being embedded in a PDF file, then make sure your Microsoft Word documents make use of one of the 14 standard typefaces available in PDF viewers (Source: Wikipedia).

• Times New Roman > Times (v3) (in regular, italic, bold, and bold italic)
• Courier New > Courier (in regular, oblique, bold, and bold oblique)
• Arial > Helvetica (v3) (in regular, oblique, bold, and bold oblique)
• Symbol > Symbol
• Wingdings > Zapf Dingbats

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