PDF

How to Password Protect a PDF Online Free

Q: How do I password protect a PDF?

Open Protect PDF, upload the file, set a strong password, and download the locked PDF. Share the password through a separate channel.

Q: Can recipients edit a protected PDF?

They need the password to open it. Permissions depend on how the file was locked — treat the password as the main gate.

Q: What if I forget the password?

Keep a copy of the unprotected original. We cannot recover lost passwords.

Q: Is Protect PDF private?

Yes — encryption runs in your browser. The file is not uploaded to our servers for locking.

August 20, 2026

Add a password before you email contracts or IDs. Protect PDFs in your browser — private and free.

Email is not a vault. Before you send a contract or passport scan, password protect the PDF and share the password via a call or separate chat. Free Converter Tool’s Protect PDF locks the file in your browser.

Lock a PDF

Protect PDF — free

Step-by-step

Open Protect PDF.
Upload one or more PDFs.
Choose a strong password (long, mixed characters).
Download the protected files. Store passwords in a manager.

Good practices

Never put the password in the same email as the PDF.
Keep an unlocked master offline if you may need to edit later.
To open your own lock later, use Unlock PDF with the same password.
Merge or compress before protecting when possible.

Protect vs unlock

Protect adds a password. Unlock removes one you already know. Neither feature is for breaking into other people’s files.

Secure before you send

Start Protect PDF Unlock your own file

Frequently asked questions

How do I password protect a PDF?

Use Protect PDF, set a password, download the locked file.

Can recipients edit a protected PDF?

They need the password to open it. Share credentials separately.

What if I forget the password?

Keep an unprotected original. Lost passwords cannot be recovered here.

Is Protect PDF private?

Yes — browser-side locking on Free Converter Tool.