Coming Soon

Protect PDF with Password

Encrypt a PDF with a user-defined password to restrict access.

What to expect:

Set a password to open the PDF
Optional owner password for editing restrictions
Choose permissions (print, copy, edit)
AES-256 encryption for maximum security
Back to PDF Tools

About This Tool

Free PDF password protect tool online — add password encryption to any PDF document to restrict who can open and read it. 100% browser-based: the PDF never leaves your device. Set an open password (required to view the document) to protect sensitive contracts, financial documents, personnel files, medical records, and confidential reports before sharing by email or file transfer. The tool uses AES-128 encryption applied directly to the PDF in your browser. Share the password securely with intended recipients through a separate channel.

How to Use

  1. 1

    Upload your PDF

    Upload the PDF you want to protect.

  2. 2

    Set a password

    Enter a strong password. Use at least 12 characters with mixed uppercase, numbers, and symbols.

  3. 3

    Download the protected PDF

    Click Protect PDF and download the encrypted file.

Frequently Asked Questions

What encryption does it use?+
The tool applies AES-128 encryption to the PDF open password, which is the standard for PDF password protection and supported by all major PDF viewers.
Can I remove the password later?+
If you know the password, you can remove it using a PDF editor. If you forget the password, the document is permanently inaccessible — store it securely.
Does it prevent printing or copying?+
This tool sets an owner password to restrict opening. Permissions restrictions (print, copy) require a separate owner password — look for a PDF editor with full permissions control for that use case.

Related Tools

PDF Watermark

Try it free →

AES Encryption

Try it free →

Password Generator

Try it free →