🔒Protect PDF
Add password protection to your PDF.
🆓 Free🔒 Secure⚡ Instant📱 Mobile-friendly🚫 No signup
Password protect your PDF files online for free. Encrypt PDF with a password to prevent unauthorized access.
Drop files here or click to upload
Max 1 file · 50 MB each
How to Use Protect PDF — Step by Step
- 1Upload the PDF you want to password-protect
- 2Enter a strong password in the field below (minimum 4 characters)
- 3Click 'Protect PDF' — AES encryption is applied instantly
- 4Download the secured PDF — recipients will need the password to open it
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Frequently Asked Questions
What encryption is used to protect the PDF?
ToolNest uses AES-128 or AES-256 encryption to password-protect the PDF, the same standard used by Adobe Acrobat.
Can I set permissions like restricting printing?
Yes. You can set an owner password to restrict printing, copying, and editing separately from the open password.
Can I remove the password later?
Yes. Use the Unlock PDF tool with the correct password to remove protection.
Is my PDF stored after protecting it?
Files are deleted within 2 hours. We never read the contents of your PDF.