Protect PDF

Protect a PDF with a password

Add modern AES-256 encryption in a temporary browser worker. Keep the password somewhere safe—FileIvy cannot recover it.

The selected PDF and password are processed by a temporary browser worker and are not included in a URL.

Your files never touch our servers.Your PDFs are processed on your device — no file upload or storage.

Before you choose a PDF

Modern password protection.

  • 01AES-256 only

    No weak RC4 or legacy encryption choices.

  • 02One-use worker

    The worker is terminated after success, failure, cancellation, or timeout.

  • 03PDF content stays as PDF

    Pages are rewritten structurally, not flattened into images.

CompatibilityCertificate-encrypted PDFs are not supported. Very old PDF readers may not support AES-256 files.

Encryption

AES-256 only

FileIvy uses the modern PDF standard security format. It does not offer weak 40-bit or RC4 compatibility modes.

Passwords

Choose a long passphrase

PDF encryption is only as strong as its password. Use a unique passphrase and save it in a trusted password manager.

Compatibility

Made for current PDF readers

AES-256 works in modern readers. Very old PDF software may need an upgrade before it can open the protected file.

Signatures

Encryption changes invalidate signatures

Protecting a file rewrites its PDF structure. Existing digital signatures will no longer verify, even when the visible pages look unchanged.