Protect PDF

Add a strong password and enforce permissions on your PDF

Password-protecting a PDF is the simplest way to make sure a sensitive document is unreadable to anyone you didn't intend to share it with. OkFarsi's Protect PDF tool encrypts your file with AES-256 — the same grade of encryption used for online banking and modern disk encryption — and lets you optionally set owner permissions that restrict printing, copying, editing, and page extraction. The resulting file opens normally in every major PDF reader; it just requires a password to do so.

Two passwords are available. The user password (also called the open password) is what someone types to open the file at all. Without it, the file is encrypted on disk and unreadable. This is the password that carries real security weight. The owner password controls what you can do once the file is open — print, copy text, edit content, extract pages, fill forms. Owner restrictions are a polite layer enforced by well-behaved readers; determined attackers can bypass them. For genuinely sensitive material, use a strong user password. Use owner restrictions only as an additional convenience layer on top.

A few practical notes. First, pick a strong password and store it in a password manager. A weak password on a strongly encrypted PDF gives you weak security — the algorithm doesn't save you from a password an attacker can guess in minutes. Second, deliver the password through a different channel than the file. Emailing the PDF and the password together cancels the protection. Third, keep a plaintext backup somewhere safe — a PDF with a password you've forgotten is as good as lost.

How to password-protect a PDF in 4 steps

1. Upload the PDF you want to protect

   Drag the file onto the upload area or click to browse. The tool reads the current file and prepares the protection options.

2. Set a strong user password

   Generate a long random password with your password manager. Avoid dictionary words, birthdays, or anything reused on other accounts.

3. Pick permissions (optional)

   Optionally block printing, copying, editing, or page extraction by setting an owner password and toggling the restrictions you want.

4. Download the protected PDF

   Run the job and download the encrypted file. Test it in a PDF reader to confirm it prompts for the password before opening.

Common use cases

• Send sensitive files by email

  Encrypt a contract, payslip, or financial statement before attaching it to an email. Deliver the password by a separate channel.

• Share confidential internal documents

  Protect board materials, HR letters, or merger-related PDFs so they remain unreadable if the email is forwarded by mistake.

• Block copy-paste on a draft

  Use owner-only restrictions to discourage casual copying from a draft that's under review, while still allowing the reviewer to read the file.

• Preserve long-term archive privacy

  Encrypt old records (tax documents, medical files) before moving them to cloud storage so a cloud breach exposes only ciphertext.

Privacy & security

Protection jobs run on isolated workers. The password you enter is used once to encrypt the file and is never logged, stored, or transmitted to third parties. The uploaded PDF and the encrypted output are both deleted from our servers shortly after your download completes. We retain only an anonymous job identifier. A practical reminder: we cannot recover a password once it's applied. If you forget the password you set, the encrypted file cannot be opened — not by you, and not by us. Store passwords in a password manager before you apply them.

Frequently asked questions