PDF Security
Protect PDF
Encrypt PDFs with a password to prevent unauthorized access.
Drop your files here
PDF · Max 25 MB
Why trust BrainyPDF
SSL Encrypted
All transfers secured
Files Auto-Deleted
Gone after processing
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How to use Protect PDF
- Step 1
Click "Choose file" or drag and drop your PDF onto the upload area.
- Step 2
Enter a password in the password field.
- Step 3
Confirm the password in the second field.
- Step 4
Click "Protect PDF" to encrypt the document.
- Step 5
Download the password-protected PDF.
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Frequently asked questions
What encryption is used?›
AES-256 encryption is applied to secure the PDF.
Do you store the password?›
No, passwords are never stored.
Is Protect PDF free to use?›
Yes. The tool is available in the free tier with monthly operation limits and no account required. Premium users get higher file-size limits and unlimited operations.
Do I need an account to use this tool?›
No account is required. Upload your file, process it, and download the result — all without signing up.
Is my data safe? Are files uploaded to your servers?›
Most PDF operations are handled directly in-browser via WebAssembly. If server-side processing is required, files are stored in encrypted temporary storage and deleted immediately after download — within 15 minutes maximum. No files are retained.
What happens if I forget my password?›
BrainyPDF does not store passwords. If you lose your password, there is no way to recover it — the encrypted PDF cannot be unlocked without it. Keep your password in a safe place.