Lock PDF
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About Lock PDF
What does Lock PDF do?
Add a password to one PDF with 256-bit, 128-bit or 40-bit protection. Your file stays on your device.
Keep your PDF private with a password. Upload your file, set a password, and the tool locks the PDF so only people with the password can open it — ideal for sensitive documents. Free to use and no signup required.
What it does
Adds a password to your uploaded PDF so it can't be opened without it.
How to use
- Upload your PDF file.
- Set a password.
- Download the locked PDF.
Key features
- Password-protects any PDF
- Keeps sensitive files private
- Quick, one-step locking
- Free, no signup, quick download
When to use it
- Sending confidential documents
- Protecting personal records
- Sharing files securely
Tips for best results
- Use a strong, memorable password.
- Store the password safely.
- Share it separately from the file.
Frequently Asked Questions
What does it do?
Adds a password to protect your PDF.
Can it open without the password?
No — the password is required.
Is my file safe?
It is processed for your download only.
Is it free?
Yes, free with no signup.
Does it work on mobile?
Yes, it works in any browser.
Try other tools
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