Microsoft, Google, and IBM Style Guides Compared: Which One Should You Adopt?
Almost nobody should write a technical writing style guide from scratch. The three biggest technology companies have already spent decades and enormous research budgets producing public, free, battle-tested guides — and the smartest move for most teams is to adopt one as a parent and layer only your specifics on top. But the three differ in tone, philosophy, and coverage in ways that matter for the choice.
This comparison is written for the person who has to decide: Microsoft, Google, or IBM? We will look at what each does best, where each falls short, and how to extend whichever you pick into a house guide. If you want the full build-and-adopt process afterward, see our guide to crafting a style guide your team will use, and the beginner's guide to technical writing for underlying craft.
Why the Big Three Matter
These guides matter because they are public, maintained, and enormous in scope — covering everything from comma usage to accessibility to how to document an error message. Adopting one instantly answers thousands of questions you would otherwise argue about internally. They are also widely known, so a writer joining your team likely already knows one, cutting onboarding time dramatically. And because they are actively maintained by dedicated teams, they stay current with evolving norms like inclusive language and accessible formatting.
Crucially, they are free and citable. When a style dispute arises, "the Google style guide says X" ends the argument in a way "I prefer X" never will. You inherit not just the rules but the authority behind them. The only real question is which philosophy fits your product and audience — which is what the rest of this article decides.
The Microsoft Writing Style Guide
The Microsoft Writing Style Guide is the warmest of the three. Its guiding principle is "warm and relaxed, crisp and clear, ready to lend a hand" — it explicitly favors a conversational, human tone, encourages contractions, and reads like a helpful colleague. It is exceptionally strong on user-interface documentation: how to refer to buttons, menus, gestures, and touch interactions, plus a deep, opinionated word list (its A-Z term entries are a goldmine).
Its bias toward consumer and product experiences makes it ideal for software with a broad, non-specialist user base — apps, SaaS products, anything where the reader is a customer rather than a fellow engineer. Where it is thinner is deep developer-reference territory like API documentation conventions; for a product with a large end-user surface and a friendly brand voice, though, Microsoft is often the most natural fit.
The Google Developer Documentation Style Guide
The Google developer documentation style guide is the developer's choice. It is crisp, concise, and unambiguous, written specifically for documenting developer products — APIs, SDKs, command-line tools, code. It excels at the mechanics developers hit constantly: how to format code samples, placeholders, command syntax, code in text, and API reference conventions. Its rulings are decisive and example-heavy, which makes it easy to apply and easy to lint against.
Google's tone is professional and direct rather than warm — less "helpful friend," more "clear colleague who respects your time." It is opinionated about concision and active voice, and it treats accessibility and inclusive language as first-class. For any team documenting a technical product aimed at developers, Google is usually the strongest default parent guide, and its formatting rules pair naturally with a docs-as-code workflow using Markdown and a linter like Vale.
The IBM Style Guide and Its DITA Heritage
The IBM Style guide is the most rigorous and structured of the three, with roots stretching back through decades of enterprise and hardware documentation. It is exhaustive and prescriptive, and it is deeply intertwined with structured authoring — IBM was central to the creation of DITA, and the guide reflects a topic-based, single-sourced, highly consistent authoring philosophy. If you produce large, long-lived, heavily-reused documentation across many products and languages, this heritage is a genuine advantage.
Available primarily as a published book rather than a free website, IBM Style suits enterprise environments with complex products, strict consistency requirements, and formal localization pipelines. It is more than most small teams need — its thoroughness can feel heavy for a lean SaaS product — but for regulated industries, hardware, or large documentation sets managed in DITA, its structured discipline is exactly the point. Its emphasis on reuse connects directly to the single-sourcing ideas in our article on sustainable documentation practices.
Head-to-Head: Tone, Structure, Coverage
On tone: Microsoft is warmest and most conversational, Google is crisp and direct, IBM is formal and precise. On audience: Microsoft leans consumer and end-user, Google leans developer, IBM leans enterprise and structured-authoring teams. On accessibility: Microsoft and Google both offer free, frequently-updated web resources; IBM is a paid book with less public visibility. On format coverage: Google is best for code and API mechanics, Microsoft best for UI and voice, IBM best for large-scale reuse and structured content.
They agree far more than they differ — all three favor active voice, second person, present tense, sentence-case headings, and concise task-based writing. The disagreements are mostly at the margins. That agreement is good news: whichever you pick, you inherit the same sound modern-documentation foundation, and switching costs later are low.
Choosing and Extending One for Your Org
Decide by matching audience to guide: developer product, choose Google; consumer or mixed end-user product with a strong brand voice, choose Microsoft; large enterprise documentation set with DITA and heavy localization, choose IBM. Then write a thin house overlay — 15 to 25 pages — that says "we follow [parent] except for the following" and covers only your product names, domain terminology, voice specifics, and deliberate departures. Never re-document what the parent already covers.
Wire the combined guide into your workflow with a linter and pull-request reviews so it is enforced, not just published. Darlo Technical Writing's Style Guide Mastery course walks through adopting and extending each of the big three, with side-by-side rule comparisons, and ships with a downloadable house-guide overlay template pre-mapped to all three parents. Explore the full library at /courses.
House-Guide Overlay Template (Mapped to Google, Microsoft & IBM)
A style-guide overlay template pre-structured to sit on top of any big-three parent guide, so you document only your exceptions instead of re-deciding everything.
Which is the best technical writing style guide: Microsoft, Google, or IBM?
There's no single best — match the guide to your audience. Choose Google for developer products (APIs, SDKs, code), Microsoft for consumer or end-user software with a warm brand voice, and IBM for large enterprise documentation sets using DITA and heavy localization. All three share a modern, sound foundation.
Are the Microsoft and Google style guides free?
Yes. Both the Microsoft Writing Style Guide and the Google developer documentation style guide are free, publicly available websites that are frequently updated. The IBM Style guide is published primarily as a paid book with less public web visibility.
Should I adopt a big-three guide or write my own?
Adopt one as a parent and write only a thin 15-25 page house overlay covering your product names, terminology, voice, and deliberate exceptions. Writing from scratch wastes months re-deciding questions these guides already answer, and adopting a known guide speeds new-hire onboarding.