概述
PDF 在所有设备上保持精确布局。DOCX 是 Microsoft Word 格式 - 可编辑且广泛使用。EPUB 是为任何屏幕设计的可重排阅读的标准电子书格式。
选择取决于您是否优先考虑固定布局（PDF）、可编辑性（DOCX）或可读的电子书（EPUB）。
正面比较
布局保留
PDF: PDF 完美保留精确布局。在每个设备和打印机上显示相同。
DOCX: DOCX 布局可能在不同版本的 Word、LibreOffice 或 Google Docs 之间发生变化。
Winner: PDF
可编辑性
PDF: PDF 在没有像 Adobe Acrobat Pro 这样的专业软件的情况下无法直接编辑。
DOCX: DOCX 在 Word、Google Docs、LibreOffice 中完全可编辑。
Winner: DOCX
阅读体验
PDF: PDF 固定布局在小屏幕上可能需要水平滚动。
DOCX: DOCX 并不是为阅读设计的 - 它是一个文档编辑格式。
Winner: EPUB（可适应任何屏幕）
兼容性
PDF: PDF 在每个浏览器、操作系统和设备上都可以原生打开。
DOCX: DOCX 需要 Microsoft Word 或兼容的办公套件。
Winner: PDF
文件大小
PDF: PDF 大小差异很大。简单文本文件较小；包含许多图像的 PDF 可能非常大。
DOCX: DOCX 通常对于文本文件非常小。
Winner: EPUB / DOCX
Fixed, Editable, and Reflowable
The three formats embody different document models. PDF describes a fixed page: it records the precise placement of text, fonts, and graphics so the page renders identically everywhere, much like a digital sheet of paper.[1][2] DOCX (Office Open XML) is an editable format: it is a ZIP package of XML parts describing content and formatting separately, designed for ongoing authoring.[3][4] EPUB is reflowable: it packages XHTML and CSS so text re-wraps to fit any screen size.[5][6]
Internal Structure
Both DOCX and EPUB are ZIP archives of structured markup, which makes their content machine-readable and separable from presentation.[4][6] EPUB, in particular, is essentially a packaged website: XHTML content documents styled by CSS. PDF, by contrast, embeds fonts and a coordinate-based content stream so layout never shifts, but this rigidity makes editing and reflowing on small screens difficult.[1]
Layout Versus Adaptability
The central trade-off is between guaranteed appearance and adaptability. A PDF looks the same on every device and prints exactly, but cannot adapt its layout to a small screen without zooming and panning.[2] An EPUB adapts to any screen and lets the reader change font and size, but its exact appearance varies by reading app. A DOCX is meant to be changed, so its rendering can differ between word processors and is not intended as a final, fixed form.[5]
Standardization
PDF is standardized as ISO 32000, with the PDF/A subset defined for long-term archiving.[1][2] DOCX is standardized as ECMA-376 and ISO/IEC 29500 (Office Open XML).[3] EPUB is a standard of the W3C.[5][6] All three are open, documented formats supported by multiple independent applications.
Applications
PDF is used for final-form documents, contracts, forms, and print, where exact layout and fidelity must be guaranteed.[2] DOCX is used for collaborative writing and revision. EPUB is used for ebooks and long-form reading, where reflowing text to the reader's device and adjustable typography are essential.[5] Documents commonly move between them: authored in DOCX, exported to PDF for distribution or to EPUB for reading.