Protect PDF

Add real AES-256 password protection in your browser. Round-trip verified: the result is test-opened with your password before download.

Runs in your browser. No account, no upload, no watermark.

How to protect pdf

  1. Drop a PDF
  2. Type the password to lock it with
  3. Protect & download — the file asks for the password when opened

Questions

How strong is the encryption?

AES-256, revision 6 — the strongest standard PDF encryption. Approved by modern readers.

Can I recover a lost password?

No — there is no backdoor, by design. Keep the password somewhere safe.

Does it restrict printing or editing?

No — anyone with the password gets full use. This tool protects opening, not permissions.

Related tools

All LocalPDF tools