Is my data secure during the merge?

All files are uploaded over an encrypted HTTPS connection. Processing happens on our server and files are automatically deleted after the merge completes. We never access, store, or share your documents.

Is my data secure during the merge?

All files are uploaded over an encrypted HTTPS connection. Processing happens on our server and files are automatically deleted after the merge completes. We never access, store, or share your documents.

2026 年 3 月更新

Free Online PDF Merger

Combine multiple PDF files into one document in seconds. No installation required. Merge PDFs directly in your browser for free.

PDF ファイルをここにドロップします

Upload 2 or more PDF files to merge

最大ファイルサイズは10MBです。サインアップさらに詳しく。

オンラインで PDF を結合する方法

Upload files, set order, and export one clean PDF in seconds.

Upload PDF Files

Drag and drop or browse your device to add 2 or more PDFs.

Arrange File Order

Move files up or down using drag and drop to set the final sequence.

Merge and Download

Generate one combined PDF and download it instantly.

Why Choose Our PDF Merger

高速処理

Merge multiple files quickly with optimized server-side processing.

Easy Reordering

Set file order exactly how you want before creating the final document.

Flexible Plans

No watermarks. Batch and size limits follow your active plan.

Preview Before Merge

Review file thumbnails before exporting to avoid ordering mistakes.

暗号化および自動削除

PDFs are uploaded over HTTPS and automatically deleted after you download the merged result. No documents are stored or shared.

あらゆるデバイスのサポート

Merge from desktop, tablet, or mobile without extra software.

PDF Merger FAQ

Quick answers about merging multiple PDF files, page ordering, quality preservation, and file size limits.

How do I merge PDF files online?

Upload two or more PDF files using drag-and-drop or the file browser. Reorder them by dragging thumbnails into the sequence you want. Click Merge and download the combined PDF — the entire process takes seconds.

Is there a limit on how many PDFs I can merge?

Free users can merge files up to 10 MB total. Paid plans support up to 500 MB and unlimited file count. There is no hard cap on the number of individual files you can combine in a single merge.

Will merging PDFs change the quality or layout?

No. Merging is a lossless operation that concatenates pages without re-encoding. Text, images, fonts, links, bookmarks, and form fields are preserved exactly as they appear in the originals.

結合する前にページの順序を並べ替えることはできますか?

Yes. After uploading, drag and drop file thumbnails to set the order. The final merged PDF follows your custom sequence from top to bottom.

Can I merge password-protected PDFs?

PDFs with a user password (open password) need to be unlocked before uploading. PDFs with only an owner password (edit restriction) can usually be merged without issues.

Does the merged PDF keep bookmarks and links?

Yes. Internal links, bookmarks, and table-of-contents entries from each source PDF are carried over into the merged document so navigation still works.

マージ中のデータは安全ですか?

すべてのファイルは、暗号化された HTTPS 接続経由でアップロードされます。処理はサーバー上で行われ、マージ完了後にファイルは自動的に削除されます。私たちはあなたの文書にアクセスしたり、保存したり、共有したりすることはありません。

Do I need to install any software?

No. The merger runs entirely in your browser and works on Windows, Mac, Linux, Chromebook, and mobile devices. No plugins or desktop software required.

Can I merge PDFs on my phone?

Yes. The tool is fully responsive and works on iPhone, Android, and tablet browsers. Upload files from your device, reorder them, merge, and download — all from the mobile browser.

What file formats can I merge?

このツールは PDF ファイルのみを受け入れます。画像または Word ドキュメントを PDF に結合する必要がある場合は、まずコンバータツールを使用してそれらを PDF に変換し、次に、生成された PDF をここで結合します。