Password Protect PDF
Add a password and encrypt your PDF. **Your file is processed securely in memory, never stored on disk.**
How to Protect a PDF File with a Password
Select Your PDF File
Click 'Select File' or drag and drop your PDF. **For maximum privacy, your file is processed directly in the server's memory and is never written to a disk.**
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 to ensure your documents remain private and secure.
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?
Absolutely. Files are transmitted securely via SSL and **deleted from server memory immediately after processing.** We never store your files on disk.
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 needed. Our tool works entirely in your web browser.