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PDF password protection

Add an AES-256 opening password to a PDF entirely on your device.

YOUR WORKSPACEProcessed on your device

Add an AES-256 password required to open the PDF. Processing stays on this device. Choose an unencrypted original, up to 10 MB and 200 pages. Save your password separately; this tool cannot recover a forgotten password.

Choose a file from your device

Unencrypted PDF up to 10 MB and 200 pages.

Opening passwordConfirm opening password

Show passwords

Use at least 8 characters, up to 127 UTF-8 bytes. No printing or copying restrictions are added. Rewriting a PDF can invalidate digital signatures. Inputs and passwords are not automatically saved by the app.

Processed on your device. Your files are never uploaded by Justility.

How privacy works

How it works

Select an unencrypted PDF, enter and confirm an opening password, then generate and download the protected PDF.

Supported formats

PDF input up to 10 MB / 200 pages. AES-256 encrypted PDF output; no password removal.

Good to know

Use at least eight characters and at most 127 UTF-8 bytes. Keep the password separately. Rewriting invalidates digital signatures; no password recovery or viewer-enforced printing restrictions are offered.

Worked example

Before

An unencrypted two-page contract and a confirmed opening password

After

A two-page PDF that requires the supplied password to open

Page content is rewritten without rasterizing images or text; the output encryption and page count are verified.

Keep access details separate from the document

Files and passwords exist only during this browser workflow. Download the output, save the password separately and use Reset to clear the workspace. Check the protected document in your intended viewer.

PDF metadata remover

Troubleshooting

Why was my protected PDF rejected as input?

This tool only adds protection to an unencrypted original. Export an unencrypted copy from its source using your authorized access first.

Common questions

Can this recover a forgotten PDF password?

No. This tool adds an opening password and does not remove protection, guess passwords or provide recovery.

Can I use this without an internet connection?

Yes, after you prepare this tool from Offline help and the browser retains its assets. Installation is optional. All processing dependencies are bundled locally.