Book metadata is the structured information that describes your book — title,
subtitle, author, ISBN, publisher, publication date, format, price, categories, keywords,
description, series and page count. It is everything about the book except the book
itself. Retailers, libraries and distributors use it to file your title, match it to
searches, and show it to the right readers.
The longer version
If the manuscript is the product, metadata is the label, the shelf position and the sign
above the aisle. A reader who finds your book has almost always been routed there by
metadata rather than by the text.
It divides into three kinds, and confusing them is where most metadata advice goes wrong.
1. Identifying metadata — fixed, factual, and mostly permanent
- Title and subtitle
- Author and contributor names
- ISBN per format, and ASIN on Amazon (how they differ)
- Publisher or imprint
- Publication date
- Format, page count, trim size, language
These describe which product this is. They should be entered once, correctly, and then
recorded somewhere you can retrieve them, because you'll be asked for them repeatedly and
they must match across every platform. Inconsistency here is how one book turns into three
unlinked listings.
2. Discovery metadata — the part you can actually optimize
- BISAC categories. The standard subject codes used across the North American trade,
maintained by the Book Industry Study Group. Retailers map their browse categories to
them.
- Retailer categories. Related but not identical to BISAC. Amazon lets you select
categories directly in KDP, and its browse structure is its own.
- Keywords. Amazon KDP provides seven keyword fields. These are phrases readers
actually type, not single words, and not repeats of words already in your title.
- Series name and number. Materially affects whether readers find book two.
- Comparable titles, where a platform accepts them.
This is the tunable layer. It rewards research and it can be changed after publication —
which most authors don't realize, and which means a poorly categorized book is a fixable
problem rather than a permanent one.
3. Selling metadata — the copy that converts
- The book description or blurb, plus its HTML version, which is a separate thing you
will re-paste more often than you expect
- Editorial reviews and endorsements
- Author biography
- Price by market and format
Why it matters more than it sounds like it should
Three concrete effects:
- Findability. Categories and keywords determine which searches and browse paths your
book appears in at all. A book in the wrong category is invisible to the readers who'd
buy it, no matter how good it is.
- Ranking context. Bestseller ranks are per-category. Category choice affects
visibility, chart placement and the badges readers notice.
- Trust. Mismatched metadata across retailers — a different subtitle here, a wrong page
count there — reads as carelessness and creates duplicate or unlinked listings.
Metadata is also the cheapest lever an indie author has. Changing categories and keywords
costs nothing and can be done in an afternoon. Changing the book costs months.
Common exceptions
- Print and ebook metadata differ legitimately — page count, format, price and ISBN are
format-specific. Title, author and series should match exactly.
- Some fields lock after publication on some platforms. Title and author are usually
the hardest to change; categories and keywords are usually the easiest.
- BISAC codes are revised periodically. A code that existed when you published may have
been deprecated.
- Non-US territories use different subject schemes — BIC and Thema are common outside
North America.
Sources
- Book Industry Study Group, BISAC Subject Headings.
- Amazon KDP Help, categories and keywords.
Verified 9 August 2026.