Does the password prevent copying or printing?
No. This tool protects opening with a password; it is not DRM and cannot prevent someone who can open the file from copying its contents.
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Protect PDF
Encrypt a PDF with an open password.
Add a PDF to get started
Drag and drop files here, or choose from your device.
Choose a file to add it to this workspace.A practical guide
How to use Protect PDF
Choose a PDF and enter a new open password twice.
Apply password encryption in your browser.
Download the protected PDF and keep the password somewhere safe.
Opening password and permissions
The tool encrypts the PDF with AES-256 and sets an open password. It does not provide digital-rights management: anyone who knows the password can open and decrypt the document. Keep an unprotected original in a safe place in case you lose the password.
Processing and limits
The PDF is processed in your browser and is not uploaded for conversion. The source file limit is 100 MB. Very large files may be constrained by device memory.
Frequently asked questions
Can PDF64 recover a forgotten password?
No. Keep the password you set. Use Unlock PDF only when you already know the password for a protected file.