Protect PDF Online with Password
Secure your PDF documents by adding password protection. Encrypt your files using AES-256 and keep your important documents protected from unauthorized opening.
Protect Your PDF
Add a password to secure your PDF document.
Your PDF is encrypted with AES-256 password protection. Your password is used to process the file and is not stored by this endpoint. Keep your password safe because it cannot be recovered if lost.
How to Protect a PDF with a Password
- Upload the PDF document you want to protect.
- Create a password with at least 6 characters.
- Enter the same password in the confirmation field.
- Click the Protect PDF button.
- Download your password-protected PDF.
Why Password-Protect Your PDF?
Password protection adds a layer of security to PDF documents containing confidential or personal information. It helps prevent unauthorized users from opening the document without knowing the password. Share the password securely with authorized recipients.
Frequently Asked Questions
How do I password-protect a PDF?
Upload your PDF, enter a password, confirm it and click Protect PDF. Download the resulting encrypted PDF file.
What encryption does this PDF tool use?
The tool requests AES-256 encryption through its PDF processing backend.
What is the minimum password length?
The password must contain at least 6 characters and cannot exceed 128 characters.
Can I protect an already password-protected PDF?
No. You must first unlock the existing PDF before uploading it.
Is there a file size limit?
The maximum supported PDF upload size is 100 MB.
Can I recover my password if I forget it?
No. Your password is not stored by the protection endpoint. Keep it safely because it cannot be recovered if lost.