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How to add a password to a PDF
Protect a PDF with an open password so recipients must enter it to view the file, using File Utils locally, plus password hygiene and sharing tips.
Protect PDF
Protect PDF wraps your document with an open password (sometimes called a user password). Anyone who receives the file needs that password in their PDF reader before contents display. That gives basic confidentiality for contracts, medical summaries, or HR attachments sent over email.
How to protect a file
- Open Protect PDF.
- Upload the PDF you want to encrypt.
- Choose a strong password: long, unique, and not reused from other accounts. Password managers excel here.
- Confirm the password if the form asks twice. Typos lock you out of your own file.
- Generate and download the protected PDF.
- Share the password through a different channel than the file (SMS, call, or a secrets tool), not in the same email body as the attachment.
Expectations
- Passwords deter casual access; determined attackers with malware or forensic tools may still capture content if a machine is compromised.
- Some viewers cache passwords. Log out or close documents on shared PCs.
Local processing
Encryption runs in the browser on supported paths, which avoids uploading the raw document to a remote converter. Still use trusted devices for confidential material.
Related
- Unlock PDF when you need a non-password copy after supplying the legitimate password.
- Security & privacy for how File Utils handles files in general.