Protect PDF
Add password protection to your PDF files
Drop files here or click to browse
Supports: .pdf (max 50.0 MB)
Password Protect PDF Online - Encrypt PDF Files Free
Add password protection to your PDF files with FileMuncher's free PDF encryption tool. Secure sensitive documents like contracts, financial records, medical files, or personal data with strong encryption. Set a password that recipients must enter before they can open or view the document contents.
All encryption happens entirely in your browser. Your PDF and password are never transmitted to any server, making this the most secure way to protect documents online. Unlike cloud-based services that handle your files on remote servers, FileMuncher ensures your sensitive data never leaves your device during the encryption process.
The tool uses standard PDF encryption that is compatible with all PDF readers including Adobe Acrobat, Preview, Chrome, and mobile PDF apps. Once encrypted, the PDF can only be opened with the correct password. Share the protected file via email or cloud storage knowing that unauthorized viewers cannot access its contents without the password.
How to Password Protect a PDF
Upload PDF
Add the PDF file you want to protect
Set Password
Enter a strong password for the document
Encrypt
Click Protect to encrypt the PDF
Download
Save the password-protected PDF
Frequently Asked Questions
How secure is the PDF encryption?
FileMuncher uses standard PDF encryption that is supported by all major PDF readers. For maximum security, use a strong password with a mix of letters, numbers, and special characters.
Is my password stored anywhere?
No. The password is used only during the encryption process in your browser and is never stored or transmitted. Make sure to remember your password, as it cannot be recovered.
Can I open a protected PDF on any device?
Yes. Password-protected PDFs work with all standard PDF readers including Adobe Acrobat, Apple Preview, Google Chrome's built-in viewer, and mobile PDF apps. Just enter the password when prompted.
Is this a free feature?
PDF protection is a Pro feature. Upgrade to a Pro subscription for unlimited access to PDF encryption and all other premium tools.
Is my PDF uploaded to any server during encryption?
No. All encryption happens locally in your browser. Neither your PDF nor your password ever leave your device, providing the highest level of security possible.