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Protect PDF

Encrypt a PDF with a password so only people who know it can open the document, using real AES-256 encryption.

Professional PDF Studio

All PDF tools in one place

Every tool you need to organize, edit, convert, compress, protect and analyze PDF files right in your browser. Fast, 100% free and completely secure.

Merge PDF Files

Merge multiple PDF documents into a single file, in the order you want.
Processed in your browser · your file is never uploaded
Select PDF files or drop them here

Supports multiple PDF files at once. Processing happens locally in your browser to protect your privacy.

Selected documents (0):
Extracted content / summary:

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How PDF password protection works

A protected PDF is genuinely encrypted: without the password its content cannot be read at all, not merely hidden. Choose a password you can share through a different channel from the file itself — sending both in the same email defeats the purpose of protecting it.

FAQ

The document cannot be recovered. That is the whole point of encryption. Store the password somewhere safe before sending the file.
Real encryption needs an engine that the site owner has to enable. Rather than hand you a file that looks protected but is not, the tool refuses to run until that engine is available — and it is already enabled on this site.
About this tool

Encrypt a PDF with a password so only people who know it can open the document, using real AES-256 encryption.

Times used: 20
Related tools: PDF Security
Unlock PDF Redact PDF Compare PDF