PDF Password Protector
Lock a PDF with a password so it cannot be opened without it.
Permissions and owner password (optional)
Permissions are honored by Adobe Reader and most apps, but some tools ignore them. The open password is the real protection.
Encryption happens in your browser with AES 128-bit, the standard supported by every PDF reader. Neither the file nor the password is uploaded.
Processing and privacy
Processing varies by tool. Check the instructions for local processing, server requests, external services and any file or request limits before entering sensitive information.
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Clear instructions
Find steps, examples and limitations below.
Use online
Open the tool in a supported web browser.
Free to use
No sign-up required. Tool-specific limits may apply.
How to use the PDF Password Protector
Lock a PDF with a password so it cannot be opened without it.
- 1 Choose a PDF file.
- 2 Enter the password twice, and optionally set permissions and an owner password.
- 3 Click Protect PDF to download the locked copy.
Example and practical tips
Lock a payslip PDF before emailing it, and send the password by text message rather than in the same email.
Frequently asked questions
Is my file or password uploaded?
No. Encryption happens in your browser.
What if I forget the password?
It cannot be recovered. Keep a copy of the unprotected original somewhere safe.
Practical guides
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How to Use PDF Password Protector
Add a password to a PDF with AES 128-bit encryption so it cannot be opened without it. Set print, copy and edit permissions, all in your browser.
Report an issue
Something broken or not quite right? Tell us and we will look into it.