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Password Protect a PDF Online — AES-128, Browser-Only

Lock a PDF with a password so only someone you share the password with can open it. WT-PDF encrypts the file locally in your browser using AES-128 — the same standard Acrobat uses — and never transmits the file to a server.

You can also restrict printing and copying with an owner password while letting anyone open the file with a user password.

Open the editor

How it works

Open wt-pdf.com and drop in your PDF.
Click the Lock button in the toolbar.
Enter a user password (required to open) and optionally an owner password (for permissions).
Toggle print/copy permissions, then Apply & Download.

User password vs owner password

The user password is required to open the file. The owner password is required to change permissions or remove encryption. You can set both or just one.

Why encrypt in the browser?

If your PDF is a contract, tax return, medical record, or HR document, uploading it to a "free PDF encryptor" site is a real exfiltration risk. WT-PDF processes the PDF locally using pdf-lib.

Remove a password later

If you know the password, use Remove PDF Password to strip the protection.

FAQ

What encryption strength is used?

AES-128, the default Acrobat uses for general-purpose PDFs. Supported by every modern PDF viewer.

Can I forget the password and recover it?

No. Encryption is real — if you forget it, the file can't be opened. Store the password in a password manager.

Is this free?

Yes — advertiser supported, no signup required.

Does encryption change the content?

No. Only the storage format changes. Content, signatures, and metadata are preserved.