Editorial Style Guide Template: The 9-Section Spec Marketing Teams Actually Use

Most editorial style guides fail the same way. They are 60 pages, they cover every imaginable case, and nobody reads them. The marketing manager opens the doc once during onboarding and never again. The freelance writer ignores it entirely. The AI brief does not reference it because the brief writer also has not read it.

The fix is a much shorter, much more opinionated guide. Nine sections, fits in a single document, settles the arguments that actually come up. Below is the template I use with marketing teams that want a style guide their team will actually consult.

Free to copy. Pairs with the AI content brief template for production workflows.

Why most style guides fail

Three failure modes account for almost every unused style guide.

Too long. A style guide longer than the average article it governs will not get read. Length signals 'reference document, look up answers as needed,' which means the writer guesses instead.

Too abstract. 'Be authentic and human' is not enforceable. 'Write in second person ('you'), not third person ('users')' is enforceable.

No examples. Every rule needs a do-this/not-that example. Rules without examples produce arguments. Examples are how the rule lives in the editor's head.

The 9-section editorial style guide

How to use each section

Voice

The reference brands are the most important part. Editors and writers do not internalize an abstract voice description. They internalize 'we sound like X, not Y.' Pick brands the team can actually pull up and read.

For this site, the reference is seoroundtable.com (news-style, direct, sourced, skeptical) and not breezy lifestyle blog voice. Two brands as anchors, not five.

Tone

Voice is constant. Tone shifts. A customer support email and a long-form article use the same voice but different tone. Naming the tone per content type prevents the writer from defaulting the article tone onto the transactional email or vice versa.

Person, tense, perspective

Pick defaults. If long-form articles default to 'you' and transactional defaults to 'we,' write that down. Without a default, every piece becomes a small voice argument with editing.

Sentence and paragraph rules

The single most-violated section in every style guide I have seen. AI drafts default to uniform-length sentences. Human writers default to long paragraphs. Specific numeric limits (sentence under 30 words, paragraph under 3 sentences for long-form) give the editor something to point at.

Words we use and do not

The replace-with table is the most-referenced part of the guide in practice. Writers consult it. Editors apply it. AI brief writers paste it into prompts. Make it long and specific.

Include the AI-tells words from the humanizer skill explicitly: utilize, leverage, robust, seamless, holistic, ecosystem, paradigm. Replace-with values for each.

Formatting

The headings rule alone settles arguments that would otherwise eat editor time. Decide once whether headings are sentence case or title case. Apply forever.

Link style is more important than people think. Generic anchor text ('click here', 'learn more') hurts SEO and AEO. The rule should require descriptive anchor text matching the linked page's topic.

Evidence and sourcing

The rule that distinguishes serious editorial work from content marketing volume. If every specific number must have a source, the team self-selects out of unverifiable claims at the brief stage instead of at the editing stage.

AI usage

Most marketing teams do not have a documented AI usage policy in mid-2026 even though every team uses AI for some part of content production. The gap produces inconsistency, brand risk, and editor frustration. Documenting where AI is allowed and where it is not closes the gap.

Examples

The most-skipped section in every draft I have seen. Five real do/not examples teach more than ten pages of rule text. The examples should update as the team produces work; freeze them in the document, refresh annually.

Running the style guide as an AI editor

The same style guide can be loaded into an AI prompt to score and edit drafts against the guide. The prompt below works for any of the major models.

Maintaining the guide

Three rhythms keep the guide useful instead of stale.

Quarterly: read the guide top to bottom. Edit what no longer matches what the team is producing. Trim ruthlessly. The guide should get shorter over time, not longer.

Per major content category launch: add the tone description for the new content type to section 2. Add formatting rules if they differ from the default. Otherwise the rules will get invented inconsistently.

Annually: refresh the examples in section 9 with do/not pulled from the year's actual edits. Old examples lose relevance. New examples teach the most-common current mistakes.

What this template does not do

Brand identity (logo, color, typography). That is a separate brand guide. Editorial style sits inside the brand guide but should not try to absorb it.

Content strategy. The guide governs how content sounds. It does not say what to publish or why. Pair with the marketing brief template and editorial calendar template for those layers.

SEO and AEO best practices. The guide can reference them but should not duplicate them. Keep one canonical source for those rules elsewhere in the team's documentation.

Done well, the style guide takes one afternoon to write the first draft and a few hours per quarter to maintain. The leverage is enormous: every piece of marketing content the team ships uses it as the reference. Which of the nine sections is least documented for your team today? Start there.