Lock PDF
Encrypt your PDF with a password. A password stops anyone without it from even opening the file, which is stronger than a permissions-only restriction. It's completely free, with no account needed.
Click or drop your file here
.pdf
How it works
1
Upload
Drop your PDF
2
Password
Choose your password
3
Download
Get the protected PDF
Features
Strong PDF encryption
— protection required to open the document.Secure
— processed securely, with automatic deletion after processing.Simple and free
— no sign-up, no limits.Why protect a PDF?
Password-protecting a PDF helps prevent unauthorized access to sensitive documents. Whether you're sharing contracts, invoices, financial reports, or personal records, adding a password ensures that only people who know it can open the file.
When should I use a password?
Before sending documents by email
Before uploading files to cloud storage
For contracts shared with clients
For personal records or financial information
Common use cases
Adding a password before emailing a confidential contract
Protecting a financial report shared with a client
Restricting access to a personal document before storing it online
Your files are handled securely
Your document and password are used only to create the protected file, then removed from our servers right after processing.
Frequently asked questions
What encryption level is used?
The PDF is protected using standard PDF password encryption. Anyone opening the file must enter the correct password before accessing its contents.
What if I forget the password?
It will be impossible to open the file: keep your password safe, there is no recovery.
Is my password sent anywhere?
Yes, encryption is processed securely on our servers; the file is automatically deleted after processing.
Do I need to install anything?
No, it works directly in your browser.
Is it free?
Yes, with no account required.
Can I protect a PDF on mobile?
Yes, the tool works on mobile browsers.
Can I change or remove the password later?
Yes, if you know the current password, you can remove it or replace it with a new one using the Unlock PDF tool.