PDFを保護

PDFにパスワードを設定します。

またはここにPDFをドロップ

100% プライベートファイルはどのサーバーにもアップロードされません

ローカルで処理より高速な処理、サイズ制限なし

完全ガイド: PDFを保護

Protecting your PDF documents with password encryption is essential for safeguarding sensitive information. Whether you're sharing confidential business proposals, personal financial documents, medical records, or legal contracts, adding password protection ensures that only authorized individuals can access the content. iLoveDoc's Protect PDF tool applies strong AES-256 encryption to your documents, the same encryption standard used by banks and government agencies. You can set both an open password (required to view the document) and a permissions password (which controls printing, copying, and editing rights). The encryption is applied entirely in your browser — your unprotected document never leaves your device and never passes through any server. This is critically important because the moment before encryption is when your document is most vulnerable. By processing locally, we eliminate the security risk inherent in uploading unprotected sensitive documents to cloud services. The protected PDF can then be safely shared via email, cloud storage, or any other channel, knowing that only recipients with the correct password can open it. Even if the file is intercepted or accidentally shared with the wrong person, the contents remain completely inaccessible without the password.

PDFを保護の使い方

1Upload the PDF document you want to protect by clicking "Select PDF file" or using drag-and-drop.
2Enter a strong password that will be required to open the document. Use a mix of letters, numbers, and symbols.
3Optionally set permission restrictions: disable printing, copying text, or editing the document.
4Click "Protect PDF" to apply AES-256 encryption to your document.
5Download the password-protected PDF and share it securely. Remember to send the password through a separate channel.

PDFを保護の使用例

Confidential Business Documents

Protect strategic plans, financial forecasts, merger documents, and competitive analyses before sharing with stakeholders or board members.

Legal Documents

Encrypt contracts, non-disclosure agreements, and court filings to ensure only authorized parties can access sensitive legal information.

Personal Records

Secure tax returns, bank statements, medical records, and identity documents before storing them in cloud storage or sharing via email.

Intellectual Property

Protect research papers, patent applications, product designs, and proprietary methodologies from unauthorized access or distribution.

iLoveDocで PDFを保護を使用する理由

🔒

ファイルは完全にブラウザ内で処理されます。当社のサーバーにアップロードされることはなく、完全な機密性とデータ保護が保証されます。

🆓

PDFを保護は完全に無料で使用でき、登録は不要で、ファイルサイズの制限もありません。必要なだけ何度でも使用できます。

⚡

ローカルブラウザテクノロジーにより、処理は瞬時に行われます。待ち時間、キュー、サーバーの遅延はありません。

PDFを保護に関するよくある質問

What level of encryption does the protection use?

We use AES-256 bit encryption, which is the same standard used by banks, government agencies, and military organizations. It is currently considered unbreakable by brute force attacks.

Can I set different passwords for opening and editing?

Yes. You can set an "open password" that's required to view the document, and a separate "permissions password" that controls editing, printing, and copying rights. This lets you share documents that can be viewed but not modified.

Is my document sent to a server for encryption?

Absolutely not. The entire encryption process happens locally in your browser. Your unprotected document never leaves your device, which is the safest approach for handling sensitive files.

What happens if I forget the password?

Since the encryption is strong (AES-256), there is no way to recover a forgotten password. We recommend storing your passwords in a secure password manager. We do not have access to your password or your files.

Can I protect a PDF that already has form fields or signatures?

Yes. Password protection can be applied to any PDF, including those with interactive form fields, digital signatures, and annotations. All existing content is preserved under the encryption layer.