KDP Title and Subtitle Rules

By SmartKDPAugust 9, 2026

Amazon KDP treats title and subtitle as metadata fields with hard rules, not as free-form SEO boxes. The title must be the real name on the cover. The subtitle is a separate optional field with the same prohibited patterns. Series name and volume are different controls again. Break the match rules and you risk rejection, a broken detail page, or a forced new edition later.

This guide is the field rulebook: what each field is for, the combined character budget, the banned patterns that trigger metadata problems, series vs volume, and cover/manuscript match. For craft (how to divide promise vs search language), see How to Title a Book for Amazon KDP. For draft names, use the free Book Title Generator. For a free pass over title/description/keywords, use the KDP Listing Checker.

Not affiliated with Amazon. Rules below paraphrase public KDP help: Books Titles & Editions, Metadata Guidelines for Books, Create a Book, and related update pages. Confirm against the live help and your Bookshelf before you publish.

The constraint that bites

The title field must equal the title on the cover — character for character as the product name, not “close enough.”

KDP’s metadata guidelines: the title field should contain only the actual title of your book as it appears on your book cover. Cover-image guidance repeats the same idea for title, subtitle, author, and series on the art. Create-a-book help adds that title, subtitle, author, series, and ISBN in the manuscript must match title setup.

Mismatch is not a style choice. It is a metadata quality failure: wrong search results, impaired buying decisions, and support or review pain.

cover text  =  KDP title + subtitle fields  =  interior title page
series name field  ≠  book title field
volume number  ≠  series name

Match rule: cover, KDP metadata fields, and interior title page must show the same title and subtitle

Field map: title, subtitle, series, volume

Field	Required?	Job	Key rule
Book title	Yes	Primary product name	Exact cover title; most-used search attribute
Subtitle	Optional	Additional content information	Same prohibited list as title; auto-colon on detail page
Title + subtitle length	—	Display budget	Fewer than 200 characters combined
Series name	Optional (if eligible)	Links volumes	Title-style guidelines; not for low-content/public domain where disallowed
Series number / volume	With series	Order	Enter digits per KDP’s series flow (not “Book 3 of 4” jammed into the series name on flows that separate number)

HTML tags are not accepted in title, subtitle, author, contributors, or keywords fields (Create a Book).

Title rules (what goes in the title field)

Must

Be the actual title on the cover
For print: appear on the cover (spine or front) and match metadata if it appears in the manuscript
Be accurate enough that search results are not misleading

Must not (examples KDP lists)

Prohibited patterns include, but are not limited to:

Prohibited pattern	Examples of the shape
Repeating generic keywords	“notebook,” “journal,” “gifts,” “books,” etc. stuffed as spam
Unauthorized other titles or authors	Riding a famous name you do not control
Unauthorized trademarks	Brand terms you are not allowed to use
Fake contribution claims	Implying people/entities who did not work on the book
Sales-rank / quality promo	“bestselling,” similar rank boasts
Ad / promo language	“free,” etc.
Placeholder-only titles	“unknown,” “n/a,” “null,” punctuation-only titles
HTML	Any tags in the title field

Collections of multiple stories should accurately reflect contents (e.g. “Collection,” “Compilation,” or “Series” where appropriate) and list stories in metadata when required by KDP’s multi-story guidance.

Subtitle rules

From KDP titles and metadata help:

Subtitle is optional.
It is a subordinate title with additional information about the content.
It must follow the same guidelines as the title.
Title + subtitle fewer than 200 characters together.
On the Amazon detail page, a colon is inserted automatically between title and subtitle — do not invent display punctuation that fights that layout.

What a subtitle is not

A second copy of the title
A keyword dump (“romance enemies to lovers billionaire free”)
A place for claims banned in the title field
A substitute for the seven backend keyword boxes

If a phrase is true discovery language but not part of the product name on the cover, put it in keywords or natural description sentences — not as illegal title stuffing.

Series title vs book title vs volume

KDP separates series identity from book title:

Series name identifies the set of connected books (must follow book-title guideline spirit; no promo spam).
Book title is still the individual volume’s name.
Series number places the volume in order (enter the number as the series flow requires — typically digits, not a full phrase like “Book Three of Four” in the number field).

Eligibility: public domain and low-content books (notebooks, journals, etc.) are not eligible for creating a series (series help, low-content).

Do not paste the series name into the book title field “for SEO,” and do not leave series off the cover if the cover claims series branding — match across surfaces.

Title field rules vs subtitle rules vs series: separate fields, shared prohibited list, combined 200-character budget

What triggers a metadata problem

Common failure modes tied to KDP’s quality and metadata guidance:

Cover ≠ metadata (title/subtitle/author/series mismatch)
Manuscript title page ≠ setup fields
Promo or misleading tokens in title/subtitle (free, bestseller, other authors, unauthorized brands)
Keyword stuffing with generic repeated terms
HTML or URLs in title/subtitle
Series claims on products that cannot use series (e.g. low-content)
Length: combined title + subtitle at or over 200 characters

KDP’s Kindle content quality notes also flag metadata that contains URLs, promotions, or references that impair good buying decisions. Treat the title fields as identity, not as an ad unit.

Pre-publish checklist for title fields

Cover front (and spine, if used) shows the exact title string
KDP Title field matches that string
KDP Subtitle matches cover subtitle (or is empty if cover has none)
Combined length under 200 characters
No prohibited promo, brand, or spam patterns
No HTML
Interior title page matches setup
Series name and volume filled only if eligible and accurate
Backend keywords do the leftover discovery work

Optional: generate alternate framings with the Book Title Generator, then validate the winner with the KDP Listing Checker.

After publish: what the rules imply

Title and subtitle are among the least flexible fields after go-live. Print titles may allow a 72-hour edit window for title/subtitle/primary author after initial publication leaves In Review; beyond that, non-typo renames often need a new edition. Typos may be fixable via Support. Cover updates must still display the current title and author. Details: Update your book details and the companion craft post on titling.

FAQ

Does the KDP title have to match the cover?

Yes. The title field should be the actual title as it appears on the cover. Cover art guidance also requires title/subtitle/author/series on the cover to match the corresponding metadata fields.

How long can title and subtitle be?

Together, fewer than 200 characters. There is no free pass for a short title plus a stuffed 500-character subtitle.

Is a subtitle required?

No. It is optional. If you use one, it must follow the same prohibited-item rules as the title.

Why is there a colon between title and subtitle on Amazon?

KDP documents that a colon is automatically added between title and subtitle on the detail page. You do not need to put the colon in the title field yourself.

Can I put keywords in the subtitle?

Only if they are true additional title language that appears as the subtitle on the cover. Subtitle is not a keyword list. Use the seven keyword fields for extra discovery phrases.

What is the difference between series title and book title?

Series name labels the set; book title names the individual volume; series number orders volumes. Do not conflate them in one field.

Can low-content books use series titles?

No. Low-content books are not eligible for creating a series under KDP’s series and low-content help pages.

What if my title is rejected or blocked?

Check match across cover/metadata/manuscript, remove prohibited promo or misleading terms, fix length, and re-read the live metadata guidelines. For post-publish renames, use the update/new-edition paths KDP documents rather than forcing a mismatched cover.

Related tools and guides

Book Title Generator — draft original title ideas
KDP Listing Checker — free guideline pass on title, description, keywords
How to Title a Book for Amazon KDP — craft and post-publish lock shape
A KDP Listing Optimization Checklist — full field order
All free KDP tools

Disclaimer

Amazon, Kindle, KDP, and related marks are trademarks of Amazon.com, Inc. or its affiliates. SmartKDP is not affiliated with, endorsed by, or sponsored by Amazon. Metadata rules change; always re-check current KDP help pages and your account before you publish or rename a title.