What is Incremental Save?

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Incremental Save

PDF Incremental Save

A PDF update method that appends changes to the end of the file without rewriting the entire document, preserving digital signatures.

技术细节

In the PDF specification (ISO 32000-2:2020), incremental save is implemented as a specialized object within the document's object graph. PDF files use a cross-reference table to index every object by byte offset, enabling random access without sequential parsing. This architecture allows incremental save to be read, modified, or extracted independently of other document elements. The binary structure supports incremental saves, where changes append to the file without rewriting existing content.

示例

```javascript
// Incremental Save: PDF manipulation example
import { PDFDocument } from 'pdf-lib';

const pdfDoc = await PDFDocument.load(fileBytes);
const pages = pdfDoc.getPages();
console.log(`Pages: ${pages.length}`);
```

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Incremental Save

技术细节

示例

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