Protect PDF
Encrypt with a password & permissions.
- Files never leave your device
- Free & unlimited
- No upload, no sign-up
Drop a PDF here
or click to browse — files stay on your device
Options
Encryption is AES-256 and runs locally. First use downloads the encryption engine (~1.3 MB, once) — your file and password never leave the device.
Done
How to Protect PDF
- 01
Add the PDF you want to protect.
- 02
Set the password (and an optional owner password), then press Encrypt.
- 03
Download the protected PDF — it now opens only with the password.
Protect PDF — questions
How strong is the encryption?
AES-256 — the strongest standard PDF encryption. Any modern reader (Acrobat X and later, browsers, Preview) opens it with the password.
What is the owner password?
The password you set opens the file. An optional separate owner password is aimed at editors and lets the author manage permissions; if you leave it blank, it is the same as your password.
The engine downloads from a CDN — is my file uploaded?
No. Only the encryption engine code (~1.3 MB, one-time) is fetched from a public CDN. Your PDF and password never leave your device — encryption runs locally inside your browser.
Can I set fine-grained permissions (printing, copying)?
This version focuses on the open password with all permissions retained. Permission-only restrictions without a password are on the roadmap.