Style Guides — the rules Amazon doesn't tell you.

For every browse node category, Amazon publishes a Style Guide — typically a PDF, sometimes a webpage, that defines what is allowed and what is forbidden in titles, bullets, images, A+ Content, descriptions, and backend keywords within that category. The Style Guides are the contract Amazon enforces. Violating them does not always produce a visible error message. Most violations result in silent consequences: titles rewritten on save, listings demoted in organic rank, ASINs suppressed from search, and in repeat-offender cases, ASINs removed from the catalogue entirely. Most brand teams never read the relevant Style Guides until they are in the middle of a suppression event.

Where to find them

The official source is Seller Central → Help → search "Style Guide [your category]". The same PDFs are also linked from the Add a Product flow when you select a browse node. Vendor Central has parallel access through Vendor Central → Items → Catalog Item Templates → Style Guide downloads. Three rules for finding the right Style Guide:

• Always use the marketplace-specific version. The US Beauty Style Guide differs materially from the DE Beauty Style Guide, which differs from the UK and JP versions. Forbidden-word lists, capitalisation rules, and byte limits diverge across locales.
• Always use the most recent version. Amazon updates Style Guides quarterly; old versions are often still cached and still indexed by Google but no longer reflect what the validator enforces.
• Match the Style Guide to the exact browse-node category. "Kitchen" and "Kitchen & Dining" can be separate Style Guides, and a multi-category catalogue often needs three or four Style Guides on the team's desk simultaneously.

What Style Guides control

• Title formula. The required structure — what goes first (brand, model, key spec, variant, size, colour), what separator characters are allowed (typically the en-dash), the capitalisation rule (title case in most categories, sentence case in a few), and the byte limit (200 characters baseline, with category-specific tighter caps as low as 80 in some apparel subcategories). Module 3 Episode 02 covers the title in depth; the Style Guide is the per-category instance of the rules described there.
• Bullet points. Count (5 in most categories, more in a few, fewer in some apparel subs), maximum length per bullet (200 characters baseline, 500 in Beauty and Health), capitalisation rules for the 2–4 word lead-in, forbidden phrases, allowed punctuation.
• Images. Main image background (pure white RGB 255,255,255 — Module 3 Episode 03), product fill percentage (85% minimum), watermarks and text overlays (forbidden on the main, allowed on secondaries), allowed file formats and minimum resolution, category-specific additional rules (apparel on-model requirements, jewellery lay-flat rules, grocery nutritional-fact visibility).
• Description and A+ Content. Maximum length, allowed HTML (essentially none in description; A+ has its own module schema), forbidden claims (medical, environmental, performance superlatives).
• Forbidden words and phrases. Superlatives ("best", "#1", "top-rated"), claims requiring substantiation ("doctor recommended", "FDA approved" without registration, "lifetime guarantee"), competitor brand names, retailer references ("as seen on Amazon"), promotional language ("free shipping", "sale", "discount"), urgency manipulation ("limited time", "last chance"), prohibited content categories per locale (some wellness claims forbidden in the EU, certain cosmetic claims forbidden in the US).
• Variation theme rules. Which themes are valid in the category (color, size, flavour, etc.) and the variation-family integrity requirements (every child must differ from siblings only along the theme axis).
• Compliance attributes. Per-category required certifications, hazmat declarations, age-restriction flags, country-of-origin requirements.

The consequences of a violation

Violations trigger one of four enforcement actions, each with its own visibility:

1. Silent rewrite. The most common outcome — the validator quietly rewrites your input (Module 4 Episode 09 documented the common patterns: capitalisation normalisation, duplicate-word stripping, forbidden-word removal). Your submission succeeds; the stored value differs from what you typed. The PDP shows the rewritten version.
2. Search suppression. The listing remains live on the PDP but is removed from search results and category browse. Existing direct links still work, but new organic discovery stops. Reviews keep flowing, ad spend keeps charging, but new organic traffic falls to near zero. Resolves automatically within 24–72 hours of the violation being fixed.
3. Listing suppression. The PDP itself becomes inaccessible — the URL returns "Currently unavailable". Existing customers cannot reorder, ad campaigns serving the ASIN throw errors, and inventory becomes stranded. Resolves on fix + Seller Support re-validation.
4. Catalogue removal. The ASIN is deleted from the catalogue. Inventory becomes unfulfillable, the URL returns a generic "page not found", and the listing must be re-created from scratch (with the loss of reviews and rank covered in Episode 14).

Amazon's automated systems run Style Guide checks continuously — typically nightly batch passes plus event-driven checks on every catalogue edit. A suppressed listing reappears only after the underlying violation is fixed and Amazon's re-validation pass confirms the fix, which can take 24–72 hours after the edit lands.

The categories with the strictest Style Guides

• Health & Personal Care, Supplements, Beauty (parts of), Baby. Tightest forbidden-word lists, strictest claim-substantiation requirements, mandatory ingredient and warning fields.
• Grocery & Gourmet Food. Nutritional information requirements, allergen disclosure rules, organic and certification claim restrictions.
• Toys & Games. Age-grade requirements, choking-hazard warnings on relevant SKUs, regulatory compliance fields (CPSIA, EN 71).
• Apparel. Strict size-chart requirements, mandatory care-instruction attributes, gender and target-shopper fields.
• Electronics & Appliances. Certification fields (FCC, CE, RoHS, ENERGY STAR), wattage and voltage disclosure, region-specific safety attributes.
• Medical Devices. The strictest gate of all — Style Guide violations here often produce immediate listing suppression with little tolerance for rewrite-and-resubmit cycles.

Per-marketplace divergence — the rules are not the same in every locale

The Style Guide that approves a listing in the US can simultaneously reject the localised version in DE. The most common cross-marketplace divergences:

• Wellness and health claims — EU rules are dramatically stricter than US. "Boosts immunity", "supports detox", "anti-aging" are accepted with substantiation in some US listings; the same claims are forbidden in DE/FR/IT/ES regardless of substantiation.
• Environmental claims — "Eco-friendly", "biodegradable", "carbon-neutral" require formal certification in EU (the EU Green Claims Directive); they are accepted with looser substantiation in US.
• Pricing language — "Sale", "discount", "best price" are restricted across all marketplaces but enforced more strictly in EU.
• Cosmetic claims — vary heavily by locale. UK accepts "anti-wrinkle"; FR requires it phrased as "reduces appearance of wrinkles".
• Children's product claims — locked down hard in DE, looser in US.

The operational rhythm

• Read the Style Guide before creating the first ASIN in any new category. Twenty minutes of reading prevents weeks of suppression cycles.
• Re-download Style Guides quarterly. Updates often introduce new forbidden words or tightened claim rules.
• Maintain a per-marketplace forbidden-word list internally as a content-team checklist. Anyone writing or translating copy checks against it before submission.
• Run a Style Guide audit pass on the existing catalogue quarterly. Rules change; existing listings that were compliant six months ago can become non-compliant after a Style Guide update.
• Audit after every major Amazon policy change announced in Seller Central → News.

What to take into the next episode

The Style Guide tells you what Amazon allows. The next episode shows how to read what Amazon currently stores — the reverse feed export, the single most useful audit tool in the entire Module 4 stack.