PDF encryption with a user password means the file cannot be opened without that password. GekiPDF applies AES-256 encryption when you use the protect-pdf tool; this is the same standard used by banks and governments. If you set a user password, anyone who tries to open the PDF will get a prompt and must type it correctly. The encryption key length is 256 bits, making brute-force attempts impractical.
There are two kinds of passwords in PDFs: user (or open) and owner (or permissions). The user password controls access to the content—without it, you see nothing. The owner password restricts actions like printing or copying, but many viewers ignore it unless enforced. Removing a user password requires knowing it first; GekiPDF can then create an unlocked copy with no password. Files up to 50 MB are accepted.
Frequently asked questions
What happens if I forget my PDF user password?
If you forget the user password, you cannot open the file at all. No tool can recover it because AES-256 makes brute force impractical. You'll need to re-create the PDF from the original source.
Can GekiPDF remove both user and owner passwords?
GekiPDF's unlock-pdf tool removes user passwords if you provide them. Owner passwords are often not needed for viewing, but if present, they may still restrict printing depending on your viewer.
Is AES-256 overkill for a simple document?
AES-256 adds negligible overhead—files stay under 50 MB and process quickly. It's useful if your PDF contains personal data or legal details, even if you only share it with one person.
Do it in the full tool
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