Types of PDF passwords
A PDF can have two distinct passwords. An open password (sometimes called a user password) is required to open and view the document. Anyone without this password sees only a password prompt, not the content.
A permissions password (owner password) is a second layer that controls what someone can do once they've opened the document. You can use it to prevent printing, copying text, or modifying the file — even for people who have the open password.
You can set one or both types. For most use cases — like sharing a confidential report — just an open password is enough.
How to password-protect a PDF on Irreva
Go to the PDF Protect tool. Upload your PDF and enter the password you want to set. Optionally, toggle the permissions restrictions — you can disable printing, copying, and editing independently.
Click Protect and download the encrypted PDF. The encryption is applied using pdf-lib in your browser. Your document is never sent to a server.
Choose a strong password that you'll remember or store safely. If you lose the password, there's no recovery option — the file stays locked.
Choosing a good PDF password
A strong password uses a mix of uppercase and lowercase letters, numbers, and symbols. Avoid simple words, names, or obvious sequences like '12345'. A password like 'Annual2026!Report' is much harder to guess than 'report2026'.
PDF encryption is generally strong (AES-128 or AES-256 depending on the tool), but a weak password can be brute-forced. The encryption is only as good as the password protecting it.
For shared documents in a team, consider whether everyone who needs access should have the password, and whether you'll need to rotate it in the future.
- At least 12 characters
- Mix of letters, numbers, and symbols
- Avoid dictionary words or names
- Unique — don't reuse passwords from other accounts
Limitations of PDF password protection
PDF password protection is a deterrent, not an absolute guarantee. Permissions restrictions (like 'no printing') can be worked around by determined users with the right software. Open password encryption is more robust — the content is genuinely encrypted and unreadable without the key.
For highly sensitive documents, consider additional measures alongside PDF passwords: watermarking the document, using a secure document sharing platform, or limiting distribution to specific recipients.