Protect PDF
Add password protection to your PDF files. Encrypt with 256-bit AES. Free, no signup — files are auto-deleted after processing.
Drag & drop your file here, or click to browse
Accepts PDF
Done!
DownloadProcessing your file...
This may take a moment. Your file is encrypted in transit and auto-deleted after processing.
How to Protect PDF
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1
Upload your PDF
Drag and drop your PDF or click to browse.
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2
Set a password
Enter a password to protect your PDF. Optionally set an owner password to restrict editing and printing.
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3
Download protected PDF
Click "Protect PDF" to encrypt. Your password-protected PDF downloads automatically.
Frequently Asked Questions
Upload your PDF to ChangeThisFile, enter a password, and click Protect. The PDF is encrypted with 256-bit AES and downloads automatically.
ChangeThisFile uses 256-bit AES encryption, the same standard used by banks and governments. This is the strongest PDF encryption available.
The user password is required to open the PDF. The owner password restricts actions like printing, copying text, and editing — even for someone who can open the file.
Yes. Your file is encrypted during transfer, processed on our server, and automatically deleted immediately after. We never store your files or passwords.
Yes. Use our Unlock PDF tool to remove password protection from any PDF — you just need to know the password.
Related Tools
Ready to protect pdf?
Add password protection to your PDF files. Encrypt with 256-bit AES. Free, no signup — files are auto-deleted after processing.