PDF Password Protector
Add a password to your PDF. Processing happens entirely in your browser — your file is never uploaded.
100% Browser-Based: Your PDF never leaves your device. All encryption is done locally using pdf-lib.
Drag & drop your PDF here
or click to browse
Select PDFHow PDF Encryption Works
1. Select PDF
Choose the PDF file you want to password-protect from your device.
2. Set Password
Enter a strong password. The file is encrypted locally in your browser.
3. Download
Download the protected PDF. Anyone opening it will need your password.
Encryption Standard: This tool uses PDF 1.7 / RC4 128-bit encryption via pdf-lib, the same standard used by many PDF readers. For highly sensitive documents requiring AES-256, we recommend Adobe Acrobat Pro. Always store your password safely — there is no recovery option.
Frequently Asked Questions
Is my file safe to use here?
Yes — this tool processes your PDF entirely in your browser using JavaScript. The file is never sent to any server, and nothing is stored after you close or refresh the page.
What happens if I forget the password?
There is no recovery option. Password-protected PDFs are encrypted and the password cannot be retrieved. Always store your password in a password manager.
Can I remove a password from a PDF?
If you know the current password, you can open the protected PDF in Adobe Reader, go to File > Print > Print to PDF to create an unprotected copy.
Does password-protecting reduce file quality?
No — adding a password only encrypts the file access. The PDF content, formatting, images, and quality remain identical.
Is RC4 encryption secure enough?
For most use cases (protecting personal documents from casual access), RC4 128-bit PDF encryption is adequate. For classified or highly sensitive data, use AES-256 via Adobe Acrobat or 7-Zip.