Which encryption is used?
The downloaded file uses PDF-standard AES-256 encryption.
No login · No sign-up · Free to use
Password Protect PDF
Add a password to a PDF with AES-256 encryption and download the protected copy in your browser.
- AES-256 password encryption
- Processed in your browser
- No account required
Choose your PDF
Choose a PDF and set a password in this workspace.
No login · No registration · No PDF sent to our app server · Up to 100 MB
Frequently asked questions
How do I add a password to a PDF?
Choose the PDF, enter and confirm a password, then select Lock PDF.
Choose your PDFHow to use Password Protect PDF
Create a password and download a locked PDF without leaving this page.
- 01
Choose your PDF
Select the PDF you want to protect.
- 02
Create a password
Enter the password twice to prevent typing mistakes.
- 03
Lock the PDF
Apply AES-256 password protection in your browser.
- 04
Download the locked PDF
Save the copy that requires your password to open.
Frequently asked questions
Is the password sent to a server?
No. The PDF and password are processed in your browser.
Can I remove the password later?
Yes. Use the Unlock PDF page with the current password.