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PDFファイルをオンラインで結合する方法 - 無料・登録不要

無料オンラインツールを使用して複数のPDFファイルを1つの文書に結合するステップバイステップガイド。登録やソフトウェアのインストールは不要。

公開日 2026年1月26日

Why Merge PDFs?

Combining multiple PDFs into a single document is one of the most common PDF tasks. Common scenarios include:

  • Combining scanned documents into one file
  • Merging report sections from different authors
  • Creating a single portfolio from multiple files
  • Consolidating invoices or receipts

How to Merge PDFs Online (Step-by-Step)

  1. Go to our Merge PDF tool
  2. Upload your files: Click "Select PDF Files" or drag and drop your PDFs
  3. Arrange the order: Drag files to reorder them as needed
  4. Click "Merge PDFs": The tool combines your files
  5. Download: Save your merged PDF

Tips for Better Results

Before Merging

  • Ensure all PDFs are in the correct orientation using Rotate PDF
  • Remove any pages you don't need with Remove Pages
  • Compress large files first to keep the final size manageable

File Order Matters

The order you arrange files determines the final page sequence. Our merge tool lets you drag and drop to reorder files before merging.

Privacy and Security

Our tool processes files entirely in your browser. Your PDFs never leave your computer, ensuring complete privacy. There's no need to worry about sensitive documents being uploaded to unknown servers.

Common Questions

Can I merge more than 2 PDFs?

Yes! You can merge as many PDFs as you need in a single operation.

What's the maximum file size?

There's no strict limit, but very large files (over 100MB each) may take longer to process.

Will the merged PDF look different?

No, the merge process preserves all formatting, fonts, images, and links from the original files.

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