Protect Your PDFs

Encrypt your PDF files with password protection to secure sensitive documents.

Set a password *

Select PDF files

or drag & drop your PDFs here

Choose PDFs

About the Protect PDF Tool

Sensitive documents — contracts, financial statements, personal records — often need a layer of protection before you share them. PDF Reducer's Protect tool encrypts a PDF with a password so that only someone who knows the password can open it, using industry-standard AES-256 encryption.

How to password-protect a PDF

1. Upload the PDF you want to protect.
2. Choose a password to secure the file.
3. Submit the request to encrypt the document.
4. Download your password-protected PDF.

Why use PdfReducer's Protect PDF tool

Uses AES-256 encryption, a widely trusted standard for protecting sensitive files.
The protected file requires the password to be opened in any standard PDF reader.
Your original file and password are not retained on our servers once the protected download is complete.
No account or software installation needed.

Frequently asked questions

What encryption does this tool use?

Files are protected with AES-256 encryption, the same strength used by many enterprise and government systems.

What if I forget the password I set?

There's no way to recover a lost password — keep it somewhere safe, since it will be required to open the file afterward.

Can I remove protection later?

You'll need the password to open the file first; from there, most PDF readers let you save an unprotected copy if you choose to.