Is it safe to password-protect my PDF here?

Yes. Your file is processed using our secure ephemeral cloud architecture. The document is permanently auto-deleted from our server the exact millisecond the encryption is complete.

What type of encryption is used?

Optimax PDF applies enterprise-grade AES-256 encryption to your PDF, rendering it impossible to open, copy, or print without the correct password.

Protect PDF — Add Password Encryption Online

Free Tier Limit Reached

You are currently using the Free Tier of Optimax PDF, which supports file uploads up to 30 MB for this tool. This helps us maintain lightning-fast, stable processing for all free users.

Your file size:

Need to protect this file? You can easily reduce its size using our compression tool first.

Compress File First

File Already Protected

This PDF file is already encrypted with a password. You must unlock it before applying a new password.

Unlock PDF First

PDF Protected Successfully!

Your document is now encrypted and requires a password to open.

Download Protected PDF