PDF Password Protector — Frequently Asked Questions
Everything you need to know about using PDF Password Protector.
Is my PDF or password uploaded?
No. PDF encryption happens entirely in your browser using pdf-lib. Both the PDF and the password stay on your device — nothing is sent to any server.
What kind of encryption is used?
PDF’s built-in 128-bit AES encryption — the standard used by Adobe and other PDF viewers. Strong enough for confidential business documents.
Will the password protect against modification?
The password gates *opening* the PDF. It also prevents printing/editing in most viewers unless the recipient knows the password. For tamper-proof distribution, use our PDF Signer in addition.
Can the password be removed later?
Yes — with the password, our PDF Unlocker can strip it. Without the password, the file is genuinely locked.
Why does the PDF look the same after protecting?
Encryption is invisible until the PDF is closed and reopened. Try sending the file to yourself or a colleague — they’ll be prompted for the password when opening it.
Try PDF Password Protector now
Add password protection to PDFs. Free, no signup, 100% private.
Open PDF Password Protector