PDF password generator
Generate strong random passwords using your browser's cryptographic RNG. Copy one and use it with the Protect PDF tool.
Your password
—
Strength: —
How to use
- Choose a length and character set.
- Click Generate new password.
- Copy the password and use it with the Protect PDF tool.
- Store the password in a password manager, not in a notebook.
How it works
OmniPDF uses window.crypto.getRandomValues() to generate truly random bytes, then converts them to characters. Nothing is sent to a server, and refreshing the page erases the password.
Privacy
Runs in your browser. Generated passwords never leave your device.
Known limitations
- OmniPDF does not store your password. If you lose it, you cannot recover the PDF it protects.
- Use a password manager to store passwords safely.
Frequently asked questions
Does OmniPDF store generated passwords?
No. Passwords are generated locally and never sent anywhere. Refresh the page and they are gone.
How long should a PDF password be?
At least 16 characters for sensitive documents, ideally 20 or more with a mix of uppercase, lowercase, numbers and symbols.
Is a longer password always better?
For random passwords, yes — each additional character multiplies the search space. A 20-character random password is far stronger than an 8-character one.