Protect PDF
Add a password to a PDF so it can only be opened with the password.
Drag & drop file(s) here, or click to browse
Select one file
Information
How to use Protect PDF
Set a password for the file, then share it separately from the document itself.
Why it helps
Uses real AES-256 encryption, so the protection holds up even if the file ends up somewhere it shouldn't.
No installation required
No standalone encryption or redaction software — protection happens right here in the browser.
Your files stay private
Especially relevant for this group: passwords and redacted content are processed only for your request, then gone.
Works on any device
Protect or unlock a file from any device — the encryption itself doesn't depend on your operating system.
Frequently asked questions
How do I add a password to a PDF?
Set a password for the file on the Protect PDF page, then share that password with recipients separately from the document.
What encryption does password protection use?
It uses real AES-256 encryption, so the protection holds up even if the file ends up somewhere it shouldn't.
Can I remove the password later if needed?
Yes — use Unlock PDF with the same password to remove the protection whenever it is no longer needed.