PDF/UA
PDF/Universal Accessibility
An ISO standard (14289) ensuring PDF documents are accessible to people using assistive technology like screen readers.
技术细节
PDF/UA uses a logical structure tree embedded in the PDF to define headings, paragraphs, lists, tables, and figure captions. Screen readers traverse this tree rather than the visual layout, enabling correct reading order even in complex multi-column designs. The tag structure follows the PDF/UA (ISO 14289) standard and maps closely to HTML semantics, making well-tagged PDFs navigable with keyboard-only and assistive technology.
示例
```javascript
// PDF/UA: PDF manipulation example
import { PDFDocument } from 'pdf-lib';
const pdfDoc = await PDFDocument.load(fileBytes);
const pages = pdfDoc.getPages();
console.log(`Pages: ${pages.length}`);
```
相关格式
相关工具
合
合并 PDF
拆
拆分 PDF
压
压缩 PDF
旋
旋转 PDF
添
添加页码
P
PDF 转 JPG
P
PDF 添加水印
P
PDF 页面重排
扁
扁平化 PDF
编
编辑 PDF 元数据
签
签署 PDF
J
JPG 转 PDF
从
从 PDF 提取文本
D
Delete PDF Pages
R
Reverse PDF
E
Extract PDF Pages
E
Extract Odd/Even Pages
R
Resize PDF Pages
C
Crop PDF
I
Insert Blank Pages
D
Duplicate PDF Pages
P
PDF to PNG
A
Add Header & Footer
A
Add Text to PDF
A
Add Image to PDF