Password Protect a PDF Online — 100% In Your Browser
100% local processing — your images never leave your browser.
Upload a PDF
Drag a PDF here, or click to choose a file
PDF files up to 100 MB
Set a password
At least 6 characters — mix letters and numbers
Write the password down
The password exists only in your browser and we cannot recover it. If you forget it, this PDF cannot be opened — keep a copy somewhere safe.
Features
Fully local
The PDF and password never leave your browser. No server, no upload.
AES-256 encryption
The 256-bit AES from the PDF 2.0 standard — the contents can't be opened without the password.
Opens everywhere
Adobe Acrobat, Chrome, Edge, macOS Preview and other mainstream readers prompt for the password.
Frequently asked questions
Is my PDF uploaded when I add a password?
No. Encryption runs inside your browser, so neither the PDF nor the password is sent to a server. You can go offline first and get the same result.
What encryption does it use, and is it secure?
AES-256, the algorithm specified by PDF 2.0. Real-world strength depends on the password — use 10+ characters mixing letters and numbers, and avoid guessable things like birthdays or phone numbers.
Can I recover the PDF if I forget the password?
No. The password is only in your browser and we keep no copy, and AES-256 has no back door. Store the password separately — never in the same email as the encrypted PDF.
How reliable is "block printing, copying and editing"?
It's a flag inside the PDF that reader apps choose to honor; some apps and converters ignore it. Treat it as a reminder, not protection. The open password is what keeps people out.
Can I change the password on an already-protected PDF?
Not yet. Remove the existing password with the original one first, then encrypt again.
Will the encrypted PDF open on a phone?
Mainstream mobile readers do — the Files app and Safari on iPhone, Chrome and Google Drive on Android — and ask for the password on open. A few very old readers may not support AES-256, so check with the recipient before sending.
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