Best AI Word Add-In: 6 Options for Editing Real Documents
Compare six AI tools that work with Microsoft Word by editing scope, review controls, access, and a worked proposal-editing example.
The best AI Word add-in is the one that can make the edit you need inside the document you will send. For proposals, memos, and reports, shortlist Deckary, Copilot, and GPT for Word. For sentence cleanup, consider Grammarly or QuillBot. For centrally managed company templates, evaluate Templafy.
Updated 26 September 2026. This comparison uses official product and support pages. Deckary is our product. The example below is an original editing exercise with a proposed answer, not a vendor benchmark or a recorded product result.
Six AI tools that work with Microsoft Word
| Tool | Word workflow | Good evaluation task | Access and pricing notes |
|---|---|---|---|
| Deckary | Office add-in | Rewrite selected text, insert a section, apply styles, add comments | Premium: $19/month or $180/year; free 14-day trial with 10 AI prompts, no card |
| Microsoft Copilot | Microsoft's in-app assistant | Draft and revise within the Microsoft 365 environment | Eligible subscription and organization settings determine access |
| GPT for Word | Word sidebar | Preview prompt-based changes; evaluate Track Changes compatibility | Confirm Word-specific terms; the public pricing page now describes Excel/Sheets plans |
| Grammarly | Desktop writing assistance in Word | Grammar, tone, and sentence rewrites | Free and paid tiers; local currency and billing period matter |
| QuillBot | Word add-in | Paraphrasing and grammar checks | Check account feature limits; requires an internet connection |
| Templafy | Enterprise document platform | Draft within approved organizational templates and content | Confirm deployment and commercial terms with the vendor |
Browser writing tools can still be useful, but they are a different comparison. If your document can live outside Word, use the broader AI document editor guide. If you want to learn the workflow first, see how to use AI in Word.
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Create and edit Word documents with AI
Draft new content and edit professional documents directly in Word. 10 free AI prompts. No credit card required.
Which add-in fits your document job?
Draft, restructure, and comment on business documents
Deckary can read document context, rewrite a selected passage, insert structured content, apply formatting, and add review comments. It is a useful candidate when a document needs several different edits in one working file. Inspect the changed text and comments before sending it; native editing does not remove the need for editorial review. See the Word agent.
Microsoft documents in-place revision and formatting with Copilot. Evaluate it if Microsoft 365 is already your team's working environment. Availability and supported actions can depend on your account and Word version. Microsoft's editing guidance.
Review proposed wording before insertion
GPT for Word documents selected-text prompting, a preview in its sidebar, rich-text support, and compatibility with Word's Track Changes mode. If tracked revisions are essential, test that exact path on a copy of your document. GPT for Word capabilities.
Do not assume comments mean tracked revisions. A comment explains a concern; a tracked deletion or insertion records a textual change. Ask for the mechanism your reviewer actually uses.
Polish sentences or standardize company documents
Grammarly and QuillBot are relevant when the main job is wording, grammar, or paraphrasing. Templafy's enterprise offering addresses a different purchasing question: whether a company can control the templates and approved material people use. Compare these by the job, rather than marking every missing feature as a weakness. Grammarly, QuillBot, Templafy.
Worked example: revise a proposal without inventing a commitment
Paste this fictional paragraph into a copy of a Word document:
We will analyze the customer data and provide recommendations very quickly. The team expects a 20% revenue increase. The client should provide the data soon. The project fee is €18,000.
Select it and use this prompt:
Rewrite this proposal paragraph in plain English. Preserve the €18,000 fee. Do not add a delivery date, revenue guarantee, or new scope. Add review comments asking for the data deadline and evidence behind the 20% forecast. Leave the rest of the document unchanged.
A suitable proposed rewrite is:
We will analyze the customer data and recommend actions to improve revenue. The project fee is €18,000. The delivery schedule will be agreed once the required data and its availability are confirmed.
The reviewer should also see two unresolved questions: when will the data arrive, and what evidence supports the 20% forecast? The unsupported forecast belongs in a review question until it has a source, not in a stronger promise.
A successful result preserves the fee, makes no new guarantee, and leaves other sections untouched. Check comments separately from the replacement paragraph. If you require tracked revisions, verify those in Word as well.
Start for Free and draft or edit in Word. Signup leads to the Office add-in; open your document in Word to use the agent. You get 10 free AI prompts, no credit card required.
Before you choose an AI Word add-in
Run three small jobs in your actual Word environment: revise one paragraph, add one formatted section, and leave comments without changing the text. Then reopen the document and inspect its headings, tables, numbering, and reviewer comments.
For a team rollout, confirm the supported operating systems, add-in installation policy, AI data handling, and the exact plan. A writing assistant that fits one author's laptop may still need a different deployment path for your organization.
If the finished document needs to become slides, use the Word-to-PowerPoint guide after the narrative and numbers are approved.
Create and edit Word documents with AI
Draft new content and edit professional documents directly in Word. 10 free AI prompts. No credit card required.