PDF（便携式文档格式）
PDF 是共享文档的通用标准，无论在任何设备和操作系统上都能保持一致的显示效果。它能精确保留字体、图像、矢量图形和页面布局，完全呈现作者的原始设计。PDF 还支持交互式表单、超链接、书签和嵌入式多媒体。
MIME 类型
application/pdf
类型
二进制
压缩
无损
优点
- + Pixel-perfect layout preservation across all platforms
- + Supports encryption, digital signatures, and password protection
- + Compact file size with built-in text and image compression
- + Searchable and indexable text content
缺点
- − Difficult to edit without specialized software
- − Reflowing content for small screens is limited
- − Scanned PDFs are image-only and require OCR for text extraction
何时使用 .PDF
当你需要在所有设备上打印和显示效果完全一致的文档时，请使用 PDF——合同、发票、简历、手册以及任何需要归档的文件。
技术细节
PDF 基于 PostScript 衍生的成像模型，将页面描述为对象集合——文本、路径、图像和注释。内容流使用 Flate (zlib) 或 JPEG 压缩，交叉引用表支持随机访问任意页面而无需读取整个文件。
历史
Adobe 联合创始人 John Warnock 于 1991 年发起了 Camelot 项目，旨在创建无纸化办公格式。PDF 1.0 于 1993 年发布，2008 年该规范成为开放的 ISO 标准（ISO 32000）。
从 .PDF 转换
转换为 .PDF
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