Password Protect PDF
Encrypt and secure your PDF document with a password. 100% client-side encryption.
Drag & drop a PDF here
We'll load it entirely on your device.
What is PDF Password Protection?
PDF password protection encrypts a PDF document so that it can only be opened with the correct password. This is essential for securing confidential documents like financial reports, legal contracts, medical records, and personal documents before sharing via email or cloud storage. Our free online PDF protector encrypts your document entirely in your browser — the PDF and password never leave your device.
How to Password Protect a PDF Online
- 1Upload your PDF
Select or drag and drop the PDF file you want to protect.
- 2Set a password
Enter a strong password that will be required to open the document.
- 3Encrypt the PDF
Click "Protect" to encrypt the PDF with your chosen password.
- 4Download protected PDF
Download the encrypted PDF. It will require the password to open.
Frequently Asked Questions
What encryption is used?
DevDeck uses pdf-lib to apply PDF encryption. The document is encrypted so that it requires the password to open and view the contents.
Can I remove password protection?
This tool adds password protection. To remove protection, you would need the original password and a PDF decryption tool.
Is my password stored anywhere?
No. Your password is used only in your browser to encrypt the PDF. It is never transmitted, logged, or stored on any server.
Will recipients need special software?
No. Password-protected PDFs can be opened with any standard PDF reader (Adobe Acrobat, Chrome, Preview, etc.) by entering the correct password.
Why Use DevDeck?
Most online PDF encryption tools upload your sensitive documents to their servers — a massive security risk. DevDeck encrypts PDFs entirely in your browser. Your documents and passwords never leave your device.