Password Protect Word, Excel & PPT

About Office Password

Encrypts a Word, Excel or PowerPoint file with a password, the same way Office's own “Protect Document → Encrypt with Password” does. The document is rewritten as an encrypted container: without the password there is nothing readable inside it, not the text, not the formulas, not the embedded images.

Two schemes exist. Agile encryption — AES-256 with SHA-512 and 100 000 rounds of key derivation — is what Office 2010 and later write, and is used here by default. The standard scheme is AES-128 with SHA-1, and is only worth choosing when the file has to open in Office 2007. Everything runs in this tab, which is the point: a document sent to a website to be encrypted has already been read by that website.

Where it helps

• AES-256 encryption by default, the same scheme current Office versions write.
• The document and the password never leave your browser.
• Protects the whole file, so nothing inside it can be read or indexed without the password.
• Works on Word, Excel and PowerPoint files alike, including the macro-enabled variants.

Limits

• Only the 2007-and-later formats can be protected; a .doc, .xls or .ppt has to be saved as .docx, .xlsx or .pptx first.
• A document that is already protected has to have its existing password removed first.
• The password is the whole of the security: a guessable one makes AES-256 beside the point.
• There is no recovery. A password nobody remembers means a document nobody can open.

Frequently asked questions

Is this the same protection Office applies?

Yes. It writes ECMA-376 encryption, the format Office itself uses, so Word, Excel and PowerPoint ask for the password normally.

What does older Office compatibility change?

It writes the standard scheme, AES-128 with SHA-1, which Office 2007 understands. Leave it off unless you know the file has to open there.

Why does it take a few seconds?

The format derives its key from 100 000 rounds of SHA-512, which is deliberate: it is what makes a stolen file slow to attack. The work runs off the main thread, so the page stays usable while it does.

Does this stop someone editing the document?

It stops them opening it. Read-only and track-changes restrictions are a separate Office feature that a reader is merely asked to honour.

Is my document uploaded?

No. The encryption runs in this tab, which is the reason to do it here rather than on a site that would receive both the file and the password.

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