Lock PDF
Password-protect a PDF to restrict viewing and editing.
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How it works
Upload your PDF and set a password. The tool encrypts the file using AES-256 standard so it can only be opened with the correct password. Download the password-protected PDF instantly.
Why use this tool?
Use this free PDF locker to protect sensitive documents like financial statements, legal agreements, and medical records before emailing them. Prevents unauthorized viewing and editing.
Frequently Asked Questions
What does locking a PDF do?
Locking adds a password that must be entered before the PDF can be opened. Without the password, the file cannot be viewed, edited, printed, or copied.
What encryption does this tool use?
The tool uses AES-256 encryption (the same standard used by banks and governments) for PDF password protection. This is virtually impossible to brute-force with a strong password.
Will the password work in all PDF readers?
Yes. The password protection follows the PDF standard and works in Adobe Acrobat Reader, Chrome's PDF viewer, Preview (macOS), Foxit, and all other major PDF readers.
Is this free?
Yes, completely free. Your PDF is encrypted locally in your browser.
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