PDF
Password Protect a PDF
Set a password and your document is encrypted, so it can only be opened by someone who knows that password.
Frequently asked questions
How strong is the encryption?
Your PDF is secured with 256-bit AES encryption, a strong modern standard for protecting documents.
Is this tool really free?
Yes — completely free, with no sign-up, no ads and no artificial limits.
Are my files kept or shared?
No. Processing happens on our servers, then the file is deleted immediately and an automatic cleanup removes any residue. Nothing is stored or sold.