Password Protect PDF
Add a password and encrypt your PDF securely.
How to Protect a PDF File with a Password
Select Your PDF File
Click 'Select File' or drag and drop your PDF. Your file is securely transmitted to our server for encryption.
Set a Strong Password
Enter and confirm your desired password. A strong password (6-32 characters) is recommended for better security.
Encrypt Your PDF
Click 'Protect PDF'. Our tool will instantly apply strong AES encryption to your document.
Download the Secured File
Once processed, a download button will appear. Click it to save your new password-protected PDF file.
The Most Secure Way to Password Protect PDFs
Maximum Security & Privacy
We use robust 256-bit encryption. The uploaded file is processed temporarily in memory and is not intentionally saved to persistent disk.
Globally Accessible
Our tool is available worldwide on any device. No geo-restrictions.
Fast and Efficient
Optimized backend processing ensures the encryption process is incredibly fast.
Works On All Devices
Use PDFsphere on any operating system—Windows, Mac, Linux, iOS, or Android.
Frequently Asked Questions (FAQ)
Is it safe to protect my PDF online?
Yes. Your PDF is securely uploaded to our server and processed temporarily in memory. The uploaded PDF is not intentionally saved to persistent disk during the protection process. After processing, the protected PDF is returned to you for download.
Is this tool free?
Yes, our tool for adding passwords to PDFs is completely free with no hidden charges.
Do I need to install any software?
No software installation is required. The tool works through your web browser, while PDF encryption is performed securely on our server.