What encryption algorithm is used?

Standard PDF encryption algorithm (AES-256) is used, compatible with Adobe Acrobat and other mainstream PDF readers.

Can the password be changed or removed?

Yes. Use the 'Unlock PDF' tool and enter the password to create a password-free version, then you can set a new password.

How compatible are encrypted PDFs?

Encrypted PDFs are compatible with all mainstream PDF readers, including Adobe Acrobat, browser built-in readers, mobile PDF apps, etc.

Are there password strength requirements?

It is recommended to use strong passwords of at least 8 characters, including uppercase and lowercase letters, numbers, and symbols for optimal security.

What if I forget the password?

Please be sure to remember your password. If you forget the password, this tool cannot recover or crack it, and you will not be able to access the document content.

PDF保護

Add password protection to your PDF documents. Set a strong password to prevent unauthorized access, protecting sensitive information, trade secrets, or personal privacy. Supports standard PDF encryption algorithms to ensure document security.

ファイルはローカルで処理され、サーバーにアップロードされることはありません。

使用例

Protect Sensitive Documents

Add password protection to financial reports, contract drafts, and other sensitive documents.

Privacy Protection

Set passwords for documents containing personal information, such as bank statements and medical records.

Trade Secrets

Protect confidential documents such as business plans and product designs, restricting access.

Secure Sharing

Add password protection when sharing documents through insecure channels such as email.

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