Protect PDF — Protect PDF encrypts your document with a password using AES — the same standard used by banks and governments. Readers must enter the password to open the file, and you can restrict what they may do: printing, copying text, modifying, or filling forms.
Your PDF and password are encrypted locally in your browser and never uploaded.
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What is protect pdf?
Protect PDF encrypts your document with a password using AES — the same standard used by banks and governments. Readers must enter the password to open the file, and you can restrict what they may do: printing, copying text, modifying, or filling forms.
Encryption happens on your device. The password never travels over the network, so you can safely protect sensitive documents like tax forms, medical records, or legal agreements.
How to use it
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Choose the PDF
Pick the document you want to encrypt.
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Set the password
Optionally add a separate owner password and permissions.
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Encrypt and download
The protected PDF opens only with the password.
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Last reviewed: 2026-09-24