What is Incremental Save?

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peasy / qr

すべてのツールガイド 24 用語集 31 ファイル形式 131 活用事例 302 API

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.

技術的詳細

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.

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}`);
```

Categories

Incremental Save

技術的詳細

例

関連フォーマット

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