Encrypt your PDF files locally. No data is uploaded to any server.
PDF or drop files here
Privacy: everything runs in your browser — files never leave your device.
Our free PDF password protection tool allows you to encrypt PDF documents with industry-standard AES-256 encryption entirely in your browser. Unlike online services that require uploading sensitive files to remote servers, this tool processes everything locally on your device, ensuring zero-knowledge security. Whether you need to protect confidential business contracts, sensitive medical records, or personal financial documents, our tool provides bank-level encryption without any risk of data exposure.
You can set separate user passwords (required to open the PDF) and owner passwords (required to change permissions), along with granular control over printing, copying, and editing permissions. The tool also handles already-encrypted PDFs—simply enter the existing password to unlock, then apply new security settings.
Protect client contracts, settlement agreements, and court filings with password-only access and print restrictions.
Secure tax returns, bank statements, and investment portfolios before sharing with accountants or financial advisors.
HIPAA-compliant protection for patient records, prescriptions, and lab results shared between healthcare providers.
Prevent unauthorized sharing of premium course materials, exam papers, and proprietary research.
We use AES-256 encryption, the same standard used by the US government for classified documents and by banks for financial transactions. This encryption method has never been publicly broken and would take billions of years to crack with current computing power.
The user password (open password) is required to view the PDF. The owner password (permissions password) controls who can modify security settings. You can set both or just one depending on your needs. For maximum security, use different passwords for each.
Yes! Use our Remove PDF Password tool. You'll need the current password to unlock and save an unencrypted version. This is useful when you need to edit or merge password-protected files.
Yes! If you have the existing password, enter it in the "Existing password" field. The tool will decrypt the file using your password, then apply the new encryption settings. This lets you change passwords or update permissions on locked PDFs.
Complete your secure PDF workflow:
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