🌍 Available worldwide — Works in any browser, any country. Your files stay private — processed 100% in your browser.

🔒 PDF 保護

PDFにパスワード保護を追加無料、高速、プライベート。

🔒

Drop PDF file(s) here

or click to browse

使い方 PDF 保護

1

ファイルを上のエリアにドラッグ&ドロップするか、クリックして選択してください。

2

ボタンをクリックして、ブラウザ内で即座にファイルを処理します。

3

処理されたファイルは自動的にダウンロードされます。登録不要!

Performance & Details

Uses AES encryption via pdf-lib. Password is applied locally — it never touches any server. Encrypted PDFs open in any standard PDF reader (Adobe, Preview, Chrome).

All processing uses pdf-lib (open-source). Files stay in your browser — zero server uploads. Last verified: May 2026.

PDF 保護全米で利用可能

PDF 保護 — Available Across Europe

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PDF 保護 — Frequently Asked Questions

What type of encryption is used?

We apply AES encryption, the industry standard used by banks and governments worldwide.

What happens if I forget the password?

There is no way to recover a forgotten password from an encrypted PDF. Keep your password in a safe place.

Can I set different permissions (print, copy)?

Currently we support open-password protection. Advanced permission controls are on our roadmap.

Will password protection slow down the PDF?

No — encrypted PDFs open just as fast as regular ones, just requiring a password first.

Is this tool suitable for legal or financial documents?

Yes — password protection adds a strong security layer for contracts, tax documents, and financial records.