Password Protection

Password Protection

Password Protection

Open Publisher allows you to fully encrypt any document with a password using the industry-standard AES-GCM encryption algorithm, implemented natively in the browser via the Web Crypto API. Once protected, the file saves as an encrypted binary blob rather than a readable .html or .opub structure – the content is completely unreadable to anyone who does not have the correct password.

How to Protect a Document

  1. How to Protect a Document

    Go to File > Protect Document, or click the Protect Document button in the ribbon.

  2. Enter a password and confirm it in the dialog.

  3. Click Protect.

Once protected, a Protected badge appears in the top-right area of the canvas, giving you immediate visual confirmation that the active document is secured.

Opening a Protected Document

  1. Open the .opub file as normal.

  2. A decryption prompt immediately appears.

  3. Enter the correct password. If it matches, the document decrypts and loads instantly.

  4. If the password is incorrect, the document remains locked.
    Opening a Protected Document and Pritecting a document

Important: No Password RecoveryNo Password Recovery

There is no password recovery mechanism. If you lose or forget the password, the document cannot be recovered under any circumstances. Always keep a backup copy of the unprotected source file stored securely before applying password protection.