Self-Publishing Metadata Guide: KDP, Categories & Keywords
Your book's metadata is the invisible infrastructure of discovery — the categories, keywords, descriptions, and codes that determine whether Amazon's algorithm shows your book to readers who are searching for exactly what you wrote. Most self-published authors underinvest here, and it costs them more visibility than any marketing spend could recover.
Build Reviews That Support Your Metadata →KDP Metadata Field Guide
Title and Subtitle
Subtitle is prime keyword real estate — include your most important search phrase here if your title isn't keyword-rich
Book Description
Opening hook, character and conflict, escalation, genre call-to-read — use HTML bold and line breaks for visual conversion
7 KDP Keywords
Phrases (3-5 words), not single words — research autocomplete for actual reader search language, include tropes and sub-genre terms
Amazon Categories
Choose the most specific sub-category that fits — you can request up to 10 categories via KDP customer service
Series Information
Series name and book number improve discovery and read-through — always complete this for series titles
BISAC Codes
Primarily matters for wide distribution via aggregators; Amazon uses its own category tree but BISAC affects non-Amazon platforms
Reviews Amplify Your Metadata Investment
Metadata gets readers to your book page — reviews convert them into buyers. A book with optimized metadata and 50 quality reviews performs dramatically better than the same book with great metadata and 5 reviews. ARC campaigns build the review base that makes your metadata work.
Start Your ARC Campaign →Frequently Asked Questions
What are the most important metadata fields for KDP self-publishing?
KDP metadata priority order: (1) Book title and subtitle — Amazon's algorithm weights title and subtitle keywords heavily; include your most important keyword in the subtitle if your title is not keyword-rich; (2) Book description — the primary sales copy that converts browsers to buyers; also keyword-weighted in Amazon search; (3) 7 KDP keywords — these directly affect search visibility; use long-tail phrases (3-5 words) rather than single words; (4) Amazon categories — two primary categories on KDP; choose the most specific sub-category you can legitimately claim, not the largest parent category; (5) Series information — series name and position improves discovery and read-through; (6) Author bio — affects author page discovery. Each field affects both search ranking and conversion.
How do I choose the right Amazon categories for my book?
Amazon category strategy: choose the most specific sub-category available that accurately describes your book — specific sub-categories have fewer competing titles and are easier to rank in. Browsing the Amazon Best Sellers in specific sub-categories tells you what's currently ranking — if a sub-category has books selling ranked 50,000-100,000 reaching the Top 10, that's an achievable ranking that can drive meaningful discovery. You can request additional categories beyond the standard two through KDP customer service — up to 10 categories total is possible for strategically important books. Misrepresenting your category (placing a thriller in a cooking category for the lower competition) violates Amazon's guidelines and risks account suspension.
How do I choose effective KDP keywords?
Effective KDP keyword strategy: use all 7 available keyword slots; use phrases (3-5 words), not individual words — 'cozy mystery series' is more effective than 'mystery'; research what readers actually search for by checking Amazon autocomplete for your genre ('paranormal romance...' and seeing what completes); include tropes and sub-genre terms that readers actively use to find books ('enemies to lovers fantasy', 'slow burn romance mystery'); avoid using author names or book titles in keywords (this violates Amazon guidelines); and include format-relevant terms for series ('complete series', 'first in series'). Keyword research tools like Publisher Rocket can identify high-search, lower-competition keyword phrases in your genre.
How do I write a book description that converts browsers to buyers?
KDP book description conversion structure: opening hook (1-2 sentences that establish stakes and intrigue — the most important sentences in your description); character and conflict (who is the protagonist and what impossible situation are they in — be specific, not generic); escalation (what makes the situation worse, what is at risk — the reader needs to feel why this story matters); and call to read (a line that positions the book in its genre and makes the reader feel this is exactly what they're looking for — genre-signal phrases like 'perfect for fans of...' are effective here). Use HTML formatting in KDP descriptions (bold for key phrases, line breaks for readability) — it displays in the product page and improves visual conversion.
What are BISAC codes and do they matter for KDP?
BISAC (Book Industry Standards and Communications) codes are standardized subject codes used across the publishing industry for categorization. For KDP specifically: BISAC codes primarily affect distribution to retailers, libraries, and databases beyond Amazon — they matter more for wide distribution than for Amazon-exclusive publishing. The BISAC code hierarchy maps roughly to Amazon's category structure but is not identical. For KDP authors, the Amazon category selection process doesn't require direct BISAC code entry — you select from Amazon's own category tree. BISAC codes become more important when distributing through aggregators (Draft2Digital, IngramSpark, Smashwords) that use them to place your book correctly across multiple retail platforms.
How often should I update my book metadata?
Metadata optimization is not a one-time task. Update triggers: when your book isn't ranking in searches despite adequate reviews; when the genre develops new popular tropes or keywords (the metadata language evolves — 'romantasy' and 'dark romance' became valuable keywords after they didn't exist); when a comparable author or book becomes very popular (using comparable author names in keywords or descriptions can be a discovery strategy); and when you notice via Amazon search autocomplete that readers are using different language to find your genre than you're currently targeting. Quarterly metadata review for active titles is a reasonable maintenance cadence — more frequently for new releases in their first 90 days.