Protect PDF
Add a password so the file asks for it every time it is opened.
Protect PDF Online Free
Protect your PDF files with a password using our free Protect PDF Online tool. Choose a password, lock the document in your browser, and download a secured PDF that opens only with the password you set.
Files never leave your device. All processing runs in your browser. We do not upload, store, or scan your documents on a server.
Anyone who opens the file will need this password. Store it safely — we cannot recover it for you. Processing stays in your browser.
How to use Protect PDF
- 1Select the PDF file you want to protect.
- 2Enter a new password and confirm it.
- 3Start the protection process.
- 4Download your password-protected PDF.
Password Protect PDF Files Online for Free
Add a password to your PDF before you share it. The lock is applied in your browser, and only people with the password can open the file.
- Set an open password on your PDF
- Keep processing on your device
- Download a protected copy instantly
- Share files more safely by email or chat
- Remove the password later with our Password Remover
What Is a Protect PDF Tool?
A protect PDF tool encrypts a document with a password so it cannot be opened without that password.
- Locks the file when someone tries to open it
- Leaves your original file unchanged on your device
- Works in the browser without installing software
- Uses a password you choose and control
Protect PDF vs Remove PDF Password
PDF Password Remover
Create an unlocked copy when you already know the password and no longer need the lock.
Tips for safer sharing
Use a strong password you do not reuse elsewhere, and send the password through a different channel than the file when you can. Keep an unlocked backup of important documents. If you forget the password, we cannot recover it for you. Need to open a locked file you own? Use PDF Password Remover with the correct password.
Protect PDF FAQs
Select your PDF, enter and confirm a password, then download the protected file.