How to Protect a PDF With a Password
PDF protection is widely misunderstood. Knowing what each option really does saves you from a false sense of security.
Two different passwords
An open (user) password encrypts the document: without it, the file cannot be read at all. A permissions (owner) password leaves the file readable but asks readers not to print or copy — a request that many readers simply ignore.
If confidentiality matters, you want an open password. Permission flags are a courtesy, not a control.
How to apply one
Pdflify runs in your browser and does not write PDF encryption, so we will not pretend to lock your file. Use a tool that genuinely does: Acrobat's Protect Using Password, macOS Preview's File → Export → Encrypt, or the Encrypt with a password option in Word's Save as PDF dialog.
Choosing and sharing the password
Use a long passphrase, not a word. Send it through a different channel than the file itself — a password in the same email as the attachment protects nothing.
When a watermark is the better tool
If your goal is to discourage forwarding or mark a draft, a visible watermark communicates far more effectively than encryption. Our Add Watermark tool stamps every page in your browser.
Frequently asked questions
Can Pdflify remove a password?
No. We do not provide password removal or cracking, including for files you own. Open the document with its password in your reader and save an unprotected copy.
Is PDF encryption strong?
Modern AES-256 PDF encryption is strong when the password is strong. Older 40-bit encryption is not.