How Client-Side PDF Splitting and Page Extraction Works
Extracting specific pages or separating a multi-page PDF into standalone documents is a common administrative and publishing requirement. Rather than uploading confidential contracts, financial statements, or legal filings to remote third-party cloud servers, our tool processes documents entirely inside your browser's local sandbox memory using pdf-lib and JSZip.
Preserving Document Geometry and Layout Fidelity
When pages are copied from the source PDF document, the underlying binary structures—including page dimensions, MediaBox, CropBox, bleed margins, embedded vector paths, fonts, and rotation angles—are copied losslessly. The resulting PDF pages maintain exact physical point dimensions (e.g. standard A4 at 595.28×841.89 pt or US Letter at 612×792 pt).
Flexible Extraction Modes
- Combined Extraction (Single PDF): Extracts only the selected pages in original document order and packages them into a single consolidated PDF file.
- Split Extraction (ZIP Archive): Creates an individual, standalone PDF for each selected page, organized with clear, collision-safe filenames (e.g.
document-page-1.pdf) bundled inside a standard ZIP archive.
Client Memory Guardrails & Security
To protect browser tabs from exhausting available device memory, files are preflighted against memory guardrails (up to 50MB and 500 pages per document). Encrypted or password-protected files are detected upfront before memory allocation, and preview resources are automatically released upon task completion or document removal.
Frequently Asked Questions
- PDFファイルが外部サーバーに送信されることはありますか？
- いいえ。pdf-libおよびJSZipを使用し、すべてお使いのブラウザのメモリ内だけで安全に処理されます。
- 単一PDFへの統合と個別ファイル分割の両方に対応していますか？
- はい。選択ページを1つのPDFにまとめる抽出と、各ページごとに分けたZIP保存の両方に対応しています。
- ページ範囲はどのように入力しますか？
- 「1-3, 5, 8-10」のように直接入力するか、ページサムネイルをクリックして直感的に選択できます。