PDFファイルを結合
複数のPDFファイルを1つの文書に結合します。ドラッグ＆ドロップでお好みの順序に並び替えできます。
PDFファイルを選択
またはここにPDFファイルをドロップ
ドキュメント統合技術：PDF結合とページ構造の解説
Merging PDF files is more than just placing pages side by side. It requires parsing the underlying document structure, managing the page tree references, and compiling resources such as fonts and images into a single cohesive binary structure.
The PDF Document Structure & Page Trees
At the code level, a PDF is organized as a directed graph of objects. The root of this graph is the Catalog, which links to a Pages tree. When merging two or more PDFs, a compiler must walk these page trees, copy the individual Page objects, resolve conflicts in font dictionaries or color spaces, and construct a new, unified page index. Simply concatenating the files would result in an invalid document.
The Security Advantage of Local In-Browser Merging
Traditional web utilities require you to upload your files to their servers, exposing sensitive business contracts or personal documents to external storage. DocumentAlter utilizes advanced JavaScript libraries (such as pdf-lib) to merge files directly inside your browser sandbox. The file binary is compiled directly in your device's memory (RAM) and never transmitted over the network, providing complete data privacy.
PDFを結合する手順（ステップ別ガイド）
Import Target PDF Documents
Select or drag and drop the PDF files you want to combine. These are loaded directly into browser memory.
Arrange Compilation Order
Rearrange the documents in the compilation queue. The merging process reads them sequentially from first to last.
Compile Page Trees
Run the merger to rewrite the cross-reference tables and save the consolidated document locally.
よくあるご質問 (FAQ)
DocumentAlterの「PDF結合」ツールにファイルをドラッグ＆ドロップし、並び順を調整して「PDF結合」をクリックするだけで即座に結合できます。
ありません。すべての処理はブラウザのローカルメモリ（RAM）上で実行されサーバーに送信されないため、容量制限はありません。
はい、100%安全です。ファイルが外部サーバーに送信されることは一切なく、すべて端末内のRAMで処理されます。