Protect PDF with a Password
Encrypt your PDF documents with a password to prevent unauthorized access. The entire process is done securely in your browser.
- Select PDF: Click the "Select a PDF" button to upload your document.
- Set Password: Enter a strong password in both fields to confirm.
- Protect & Download: Click the "Protect & Download" button. The tool will encrypt the file and your browser will automatically start the download.
This tool uses the `pdf-lib` JavaScript library to apply standard PDF password-based encryption (RC4 or AES) to your document. This process happens entirely within your web browser. When you select a file and provide a password, the tool reads the PDF's content, encrypts it using your password, and then initiates a download of the new, protected file. Your original file is not modified, and your password and file contents are never sent to a server.
How secure is the encryption?
The tool uses standard PDF encryption algorithms. While this provides good protection against casual snooping, it can be vulnerable to brute-force attacks if a weak password is used. Always use a strong, unique password for sensitive documents.
What happens if I forget the password?
If you forget the password, there is no way to recover it. The encryption is designed to be irreversible without the correct password. Make sure you store your password in a safe place.
Can I remove a password from a PDF?
Yes, you can use our 'Unlock PDF' tool. You will need to know the current password to remove it.
Is this process secure and private?
Absolutely. Your files and the password you enter are never uploaded or transmitted. All encryption is performed on your computer, by your browser.