// The guide

Claude for Word: tracked changes and contract review.

2026-07-15 · 4 min read · by Nabil BA-MOH

The counterparty's redline lands at 6:40 pm. Forty-two pages, a hundred tracked changes, and somewhere in there — always — two edits that actually move money or risk, camouflaged among ninety-eight cosmetic ones. Your evening is now a needle hunt.

And the AI you'd like to throw at it gives you text in a chat bubble — which you'd have to paste back, re-format, and re-mark as changes by hand. Useless where it counts.

Claude for Word is the version that works where lawyers and operators actually live: inside the document, in native tracked changes. It's Anthropic's official add-in, generally available since May 7, 2026 as part of Claude for Microsoft 365.

Native tracked changes: the whole ballgame

When Claude edits your document, the edits arrive as real Word tracked changes — the same revision marks a human editor would leave. Which means:

• You review with the tools you already trust: accept, reject, next.
• Nothing is silently rewritten. Every proposal is visible, attributable, reversible.
• The document's styles, numbering and formatting survive. Claude edits selected passages preserving all three — no more pasting AI text and watching your heading numbers explode.

This is the line between "AI wrote me some text" and "AI is a colleague in my revision workflow."

The contract-review workflow

The feature built for that 6:40 pm redline: counterparty redline synthesis. Claude reads the marked-up contract and summarizes what the other side changed — flagging the revisions worth contesting, so you start from the two edits that matter instead of wading through a hundred.

Around it, the supporting cast:

• Document Q&A with clickable citations — ask "what did they change about liability?" and the answer links to the exact sections. Verify by click, not by faith.
• Comment-thread handling — Claude edits the anchored text and replies inside the thread, keeping the negotiation trail where it belongs.
• Template filling that inherits styles — your engagement letter or proposal template, populated, still looking like yours.

Standard caution stands: this accelerates legal review; it doesn't replace legal judgment. The tracked-changes format is exactly what keeps the human accountable.

Cross-app: the numbers walk in from Excel

Claude for Word is part of one conversation across Microsoft 365: it can read figures in Excel and write them into your Word document — or feed a PowerPoint deck — without copy-paste. The caveats: it works on open files only, it can't create, open or close files itself, and cross-app chat history doesn't persist between sessions.

Install and availability

1. Word → Insert → Get Add-ins → search "Claude by Anthropic" (Word listing WA200010453; there's also a bundled Excel+PowerPoint+Word listing).
2. Sign in with a paid Claude account — Pro, Max, Team or Enterprise, no surcharge. On Team/Enterprise an admin must enable it.
3. Works on Word for the web, Windows and Mac. Not on 2016/2019 perpetual licenses or Android.

An Outlook add-in shipped the same day in public beta, if your redlines arrive by email.

Fine print worth knowing

• By default, inputs and outputs are auto-deleted within 30 days (with exceptions); custom retention policies are Enterprise-only. If you handle privileged documents, that's a conversation with your admin before adoption, not after.
• Documents from outside parties are a prompt-injection surface — a hostile file can carry hidden instructions. Treat unknown documents with the same suspicion you'd give their attachments.

FAQ