August 4, 2026
Self Published Books on Amazon: 2026 Glossary (40+ Terms)
A complete 2026 glossary for self published books on Amazon: 40+ KDP terms—royalties, KU, ISBN vs ASIN, ads. Learn fast and publish smarter.
TL;DR
More than 1.4 million self published books on Amazon hit the marketplace every year, and the terminology can be overwhelming. This glossary breaks down 40+ essential terms across platform setup, book formats, royalties, distribution, and marketing. Whether you’re trying to understand KDP Select, figure out the difference between an ASIN and an ISBN, or decode Amazon’s royalty tiers, every term is explained in plain English with current numbers and practical advice.
Every year, over 1.4 million books are self-published on Amazon. That number keeps climbing, and so does the wall of jargon standing between aspiring authors and their first published title. ASIN, BSR, KENP, KDP Select, going wide, delivery fees, backend keywords. The terminology alone can make you feel like you need a degree just to upload a manuscript.
This glossary exists to fix that. Below you’ll find every important term related to self published books on Amazon, organized by category, defined in plain language, and paired with the real numbers and practical context that actually matter. If you want a step-by-step KDP publishing guide, we have that too. But start here to build the vocabulary that makes everything else click.
Looking for professional help with the entire process, from manuscript to marketplace? Explore Alpaca Authors’ publishing services for upfront pricing and full creative control.
Amazon Platform and Account Terms
Kindle Direct Publishing (KDP)
Amazon’s free self-publishing platform. KDP allows authors and publishers to distribute digital ebooks, print-on-demand paperbacks, and hardcover books directly to Amazon customers worldwide. There is no cost to create an account or upload a book. You earn royalties on each sale.
KDP is the dominant force in self-publishing. It holds roughly 70% of the self-pub market share, and 90% of self-published authors use the platform. If you’re publishing a book in 2026, this is almost certainly where you’ll start.
KDP Select
A 90-day program that requires your ebook to be sold exclusively on Amazon. In exchange, your ebook is automatically enrolled in Kindle Unlimited and you gain access to promotional tools like Kindle Countdown Deals and Free Days.
The exclusivity requirement only applies to ebooks. You can still sell paperback and hardcover editions anywhere you want. This is one of the most commonly misunderstood rules in Amazon self-publishing.
Practical note: Practitioners on Reddit’s self-publishing communities generally agree that KDP Select works best for romance, fantasy, sci-fi, and thriller series, where readers consume books quickly and KU’s subscription model encourages sampling new authors. For non-fiction, literary fiction, or books priced above $6.99, going wide often makes more sense.
Kindle Unlimited (KU)
Amazon’s ebook subscription service. Readers pay a monthly fee for unlimited access to a large catalog of ebooks and audiobooks. Authors enrolled in KDP Select earn money based on pages read, not copies sold.
The payout comes from Amazon’s KDP Global Fund, which hit $58.6 million in January 2025 alone (including $3.4 million in bonuses). A full read-through of a typical novel earns roughly $1.35.
Author Central
A free Amazon service that gives you control over your author profile page. You can add a bio, photos, blog posts, and link all your titles under one author page. It also provides sales data through the Author Central dashboard.
Think of it as your Amazon storefront. Readers who click your name on any book listing land here.
Amazon Advertising (AMS)
Amazon’s self-serve advertising platform for books. You create Sponsored Product ads that appear in search results and on competitor book pages. You set a daily budget, choose keywords or product targets, and pay per click.
Amazon Ads are the primary paid discovery channel for self published books on Amazon. They are available to all KDP authors, not just those enrolled in KDP Select.
Book Identifiers You Need to Know
ASIN (Amazon Standard Identification Number)
A 10-character alphanumeric code that Amazon assigns to every product on its marketplace. Every Kindle ebook gets an ASIN automatically. It is Amazon-specific and cannot be used anywhere else.
ISBN (International Standard Book Number)
A global book identifier recognized by bookstores, libraries, and distributors worldwide. The key difference: an ISBN is industry-wide, while an ASIN only works on Amazon.
If you are publishing a Kindle ebook only on Amazon, you do not need an ISBN. Amazon assigns an ASIN instead. For print books, you have a choice.
Free KDP ISBN vs. Purchasing Your Own
KDP offers a free ISBN for print editions. The catch: Amazon becomes your publisher of record, and your imprint will display as “Independently Published.” You cannot transfer this ISBN to another platform.
Buying your own ISBN (through Bowker in the US) lets you list your own imprint name and distribute through any retailer or library system. If you plan to sell through bookstores or distribute beyond Amazon, owning your ISBN matters. For a detailed walkthrough, see our guide on how to obtain an ISBN number.
Book Formats on Amazon
Ebook (Kindle Edition)
The digital version of your book, sold through the Kindle Store. You can upload your manuscript as a .docx, .epub, or .kpf file, and KDP converts it for Kindle devices and apps. Ebooks have no printing cost and no inventory.
Paperback (KDP Print)
A trade paperback printed through Amazon’s print-on-demand infrastructure. Books are manufactured one at a time as orders arrive. You never hold inventory, and Amazon handles fulfillment.
Hardcover (KDP)
Available since 2021 for the 6×9 inch trim size. Hardcovers carry a higher print cost but support higher retail prices and are perceived as premium by readers and gift buyers.
Print-on-Demand (POD)
The manufacturing model behind KDP Print. Instead of ordering 500 or 1,000 copies upfront, each book is printed individually when a customer orders it. No warehouse, no risk of unsold copies. This model is central to how self published books on Amazon keep startup costs low. For a deeper comparison of POD platforms, read our print-on-demand services guide.
Trim Size
The physical dimensions of your printed book. Common options include 5×8 inches, 5.5×8.5 inches, and 6×9 inches. Your choice of trim size affects spine width, page count, printing cost, and how the book feels in a reader’s hand.
Bleed vs. No Bleed
Bleed means images or design elements extend to the very edge of the page. If your book has full-page illustrations or photographs that reach the margins, you need bleed formatting. No bleed means all content stays within a defined margin. Bleed adds slightly to file dimensions and printing cost.
ePub
The industry-standard file format for ebooks. Most retailers accept ePub directly. Amazon’s Kindle system converts ePub files into its own format during upload, so you can use ePub as your master file across platforms.
Audiobook
The spoken-word edition of your book. Amazon sells audiobooks primarily through Audible. Self-published authors can produce and distribute audiobooks through various platforms. If you’re interested in this format, our audiobook self-publishing guide covers costs, narrators, and distribution options.
Royalties and Pricing Terms
This is where the money lives, and where most confusion starts for authors publishing self published books on Amazon.
70% vs. 35% Ebook Royalty
KDP offers two royalty tiers for ebooks. The 70% option is available for books priced between $2.99 and $9.99. The 35% option applies to all price points, including books priced below $2.99 or above $9.99.
The difference between pricing at $2.98 and $2.99 is the difference between earning 35% and 70% on every sale. For context, here’s what an author earns per ebook sale on the 70% tier (after delivery fees): approximately $2.01 at $2.99, $3.41 at $4.99, and $6.91 at $9.99.
Pricing wisdom from the community: Practitioners on Reddit frequently warn that new authors pricing at $9.99 kill their discoverability. The consensus: start at $2.99 to $3.99 to build initial traction and reviews, then raise prices as your catalog grows.
Delivery Fee
A cost deducted from your 70% royalty earnings. Amazon charges $0.15 per megabyte of your ebook’s file size for each sale. A text-only novel might cost $0.05 to $0.15 per sale. Image-heavy books can see delivery fees of $1.00 or more, which is why some illustrated ebook authors choose the 35% tier instead.
Print Royalty (50% and 60% Tiers)
Starting June 10, 2025, Amazon introduced tiered print royalty rates. Books priced at $9.99 (US) or above earn a 60% royalty. Books priced below $9.99 earn only 50%. This was a significant structural change. Previously, all print books earned 60%.
Your actual payout is this royalty percentage applied to the list price, minus the printing cost.
Printing Cost
The manufacturing cost Amazon deducts before calculating your print royalty. For a black-and-white paperback, the formula is $0.85 fixed cost plus $0.012 per page. A 300-page paperback costs approximately $4.45 to print. Color interiors and hardcovers cost substantially more.
For a full breakdown of what authors spend on publishing, including editing, covers, and formatting, our self-publishing cost breakdown covers the numbers.
KDP Global Fund
The monthly pool of money Amazon sets aside to pay KDP Select authors for Kindle Unlimited page reads. The fund size varies monthly based on total KU subscriptions. In January 2025, Amazon reported $55.2 million in the Global Fund plus $3.4 million in bonuses.
KENP (Kindle Edition Normalized Pages)
Kindle Edition Normalized Pages. Amazon’s standardized way of measuring pages read in Kindle Unlimited. Because books have different formatting, font sizes, and layouts, KENP normalizes everything to a consistent page length. Authors in KDP Select are paid per KENP read.
The per-page rate fluctuates monthly but has hovered around $0.004 to $0.005 per page in recent years.
Minimum List Price
The lowest price Amazon allows you to set while still covering printing costs and a minimum royalty. For ebooks on the 70% tier, the floor is $2.99. For print books, the minimum is calculated based on your printing cost plus Amazon’s cut. You can’t price below what it costs Amazon to produce and sell the book.
If you’re wrestling with the pricing math, Alpaca Authors’ book marketing team can help you find the sweet spot between discoverability and profitability.
Sales, Ranking, and Discoverability
Best Seller Rank (BSR)
A number Amazon assigns to every product that has made at least one sale. It ranks your book against other products in the same category. A lower number means more sales.
Amazon updates BSR roughly every one to two hours, so the number is volatile. A book that sells five copies in the morning might have a BSR of 15,000, then drift back to 80,000 by evening if no more sales come in.
BSR benchmarks worth knowing: Under 10,000 indicates strong daily sales. Under 100,000 suggests consistent movement. Above 500,000 usually means infrequent sales.
A book becomes an Amazon bestseller by having the lowest BSR in its category, not by hitting a specific sales number. This is why category selection matters so much.
Amazon Book Categories
When you publish through KDP, you assign your book to categories: nodes in Amazon’s merchandising tree like “Science Fiction > Space Opera” or “Business > Marketing.” Categories influence where your listing appears in browse, which other titles Amazon treats as close substitutes, and how easy it is to earn a bestseller badge.
One of the most common beginner mistakes is choosing wrong categories and effectively burying the book in a mismatched section where the target audience never looks.
Backend Keywords
Seven keyword fields in KDP (each up to 50 characters) that influence search visibility but are invisible to shoppers. These are your chance to tell Amazon’s algorithm what your book is about using terms that don’t appear in your title or subtitle.
Use specific phrases readers actually search for. Avoid stuffing author names or trademarked terms, which violate KDP policy.
Metadata
The collective term for your book’s title, subtitle, description, keywords, and categories. Metadata is the engine of discoverability for self published books on Amazon. Get it wrong, and even a great book sits unseen. Practitioners on Reddit’s self-publishing communities frequently note that the platform itself isn’t the bottleneck; presentation and discoverability are.
A+ Content
Enhanced product page content available to authors through Author Central. A+ Content lets you add formatted text, comparison charts, images, and banner graphics below the standard book description. It’s free and can improve conversion rates, especially for non-fiction.
Also-Boughts
The “Customers who bought this item also bought” section on an Amazon product page. These recommendations are algorithmically generated based on purchasing patterns. Strong also-boughts (appearing alongside popular books in your genre) can drive significant organic traffic.
Distribution Strategies
Going Wide
Publishing your book across multiple platforms beyond Amazon: Apple Books, Barnes & Noble, Kobo, Google Play, libraries, and more. Going wide means your ebook is not enrolled in KDP Select.
In PublishDrive’s aggregated 2025 distribution data, Amazon.com and Amazon Print together still accounted for 77% of total book sales revenue. But that remaining 23% represents real money, especially for authors building long-term careers.
For a complete breakdown of multi-platform options, see our guide on publishing on Amazon and other platforms.
Exclusive (Amazon-Only)
When an author says they’re “exclusive,” they typically mean their ebook is enrolled in KDP Select, which requires 90-day exclusivity with Amazon. Remember: this exclusivity only applies to ebooks. Your print and audiobook editions can be sold anywhere.
KDP Select can be worth it if your primary audience lives in the US and UK and you write in high-volume genres. It is not worth it if your target market is outside those regions, your genre does less well in Kindle Unlimited, or you want to build steady revenue across diverse markets.
IngramSpark
A major print distributor used by about 25% of print self-publishers. IngramSpark connects your book to bookstores, libraries, and wholesalers worldwide. If you want your paperback on the shelves of independent bookstores or listed in library catalogs, IngramSpark is typically the path.
Draft2Digital
An ebook and print-on-demand aggregator that distributes to over 400 stores for indie authors. Instead of creating separate accounts on Apple Books, Kobo, Barnes & Noble, and others, you upload once to Draft2Digital and they handle distribution.
Expanded Distribution
A KDP option that makes your print book available through third-party retailers, online stores, and libraries beyond Amazon’s own marketplace. The royalty rate on expanded distribution sales is lower than direct Amazon sales, but it broadens your reach without requiring a separate IngramSpark account.
Marketing and Launch Terms
ARC (Advance Reader Copy)
An early version of your book sent to reviewers before the official publication date. The goal is to generate reviews that go live on launch day or shortly after. Reviews are critical social proof for self published books on Amazon, especially in the first few weeks.
For practical tips on timing ARCs and building your launch calendar, check out our book launch planning guide.
Kindle Countdown Deal
A time-limited price promotion available only to KDP Select authors. Your ebook’s price drops on a countdown timer, and you still earn the 70% royalty rate even if the promotional price is below $2.99. This is one of the key perks of exclusivity.
KDP Free Days
KDP Select authors get 5 days per 90-day enrollment period to offer their ebook for free. Free days can drive thousands of downloads, boost your also-boughts, and push readers into a series. The tradeoff: you earn $0 on those downloads.
Pre-Order
You can set up a Kindle ebook for pre-order up to 12 months before your release date. Pre-orders let you build anticipation, run early marketing campaigns, and have all pre-order sales count toward your BSR on launch day. Print pre-orders are not available on KDP.
Book Blurb
The brief, compelling summary that appears as your book’s product description on Amazon. It is not a synopsis. A blurb is a sales pitch: its job is to make the reader want to buy. Most successful blurbs are 150 to 250 words with a hook, a setup, and a cliffhanger or promise.
BookTok
TikTok’s book community, where short-form video reviews, recommendations, and reading vlogs drive massive sales spikes. Viral BookTok attention has turned unknown self-published titles into Amazon bestsellers overnight. In 2026, demand is increasingly driven by this kind of algorithmic social discovery, where trends translate directly into BSR spikes.
Author Platform
The collective reach an author has: email list, social media following, website, blog, podcast, speaking engagements. Practitioners on Reddit repeatedly flag one regret above all others. As one author put it: “I published 8 books before starting an email list. Biggest regret.” Your platform is the only marketing asset you fully own.
Backend Keywords vs. Metadata (Revisited)
Together, your title, subtitle, description, categories, and backend keywords form your book’s complete metadata package. This is what Amazon’s search algorithm reads to decide where to show your book. Optimizing metadata is the single highest-ROI marketing activity for most indie authors.
Publishing Models: Know the Difference
Self-Publishing
The author handles (or hires help for) editing, cover design, formatting, and distribution. The author retains full copyright and creative control. Costs vary, but self-published authors spend an average of $2,300 per title on production.
Self-published titles now outnumber traditionally published books in the US by more than 5 to 1. The global self-publishing market reached approximately $1.85 billion in 2024 and is projected to grow to $6.16 billion by 2033.
Assisted Self-Publishing
A model where authors receive professional help with editing, design, formatting, and distribution but retain full ownership of their work and creative control. This is distinct from vanity publishing because the author keeps all rights and makes all final decisions.
Alpaca Authors operates in this space, providing professional book publishing services with editorial, cover design, ISBN setup, and distribution to 40+ global platforms, while authors retain full IP and copyright ownership.
Vanity Press
A company that charges authors a fee to publish their books, often without providing meaningful editorial or marketing support. The red flags: they accept every manuscript, upsell constantly, and may claim partial rights to your work. Self-publishing is not a vanity press. Know the difference before signing anything.
Hybrid Publishing
A model that blends elements of traditional and self-publishing. The author typically pays for production services, but the publisher provides editorial curation, distribution infrastructure, and sometimes an advance. Quality varies enormously. Some hybrid publishers are excellent; others are vanity presses with better marketing.
Traditional Publishing
The author signs with a publisher (usually via a literary agent), receives an advance against royalties, and the publisher handles editing, design, printing, and distribution. The publisher takes the financial risk and keeps the majority of revenue. Authors typically earn 10 to 15% of the cover price on print editions and 25% on ebooks.
Common Beginner Mistakes
Understanding terminology is half the battle. Here are the pitfalls that trip up first-time authors of self published books on Amazon, drawn from author communities and practitioner experience:
Assuming Amazon equals discoverability. Uploading a book to KDP does not mean anyone will find it. On Amazon, your book will be buried under a mountain of other books unless you actively drive traffic through ads, social media, email, or category optimization.
Publishing a first draft. Skipping professional editing is the fastest way to collect one-star reviews. Readers in 2026 don’t distinguish between indie and traditionally published ebooks. What they see is quality, or the lack of it.
Skimping on cover design. Readers judge instantly. A cover that looks homemade signals amateur content, fair or not. Genre-appropriate, professionally designed covers improve ad click-through rates and conversion.
No launch plan. Publishing without ARCs, pre-orders, or a review-gathering strategy means your book launches into silence. The first 30 days matter enormously for Amazon’s algorithm.
Quitting after one book. Series momentum is real. One author on Reddit shared the trajectory plainly: “Book 1 earned $34 total. Book 2 earned $180. Book 3 earned $1,200.” Don’t evaluate the business model on a single title.
Ignoring the AI content risk. Amazon increasingly flags AI-generated content. Reddit reports accounts suspended for ChatGPT-written books without substantial human editing. If you use AI tools in your workflow, the final product needs clear human authorship and editing.
Self-Publishing Income: What to Expect
The numbers are sobering but important. Approximately 75% of self-published authors earn less than $1,000 per year from their books. That’s the broad population, including authors who published a single title and never marketed it.
The picture improves dramatically for committed indie authors who treat publishing as a business. The ALLi 2025 survey of serious self-published authors reports a median income of $13,500 per year, up 6% year over year. Self-published authors now capture 51% of overall ebook unit sales and more than 34% of ebook retail revenue.
The gap between “published a book” and “built a publishing business” is enormous. That gap is filled with the skills and terms in this glossary.
FAQ
Is it free to self-publish on Amazon?
Yes. Creating a KDP account and uploading your book costs nothing. Amazon deducts its share from your royalties on each sale. However, producing a professional book (editing, cover design, formatting) typically costs around $2,300 on average.
Do I need an ISBN to publish on Amazon KDP?
Not for ebooks. Amazon automatically assigns an ASIN. For print editions, KDP offers a free ISBN, though Amazon becomes your publisher of record. Buying your own ISBN gives you flexibility for wide distribution and your own imprint name.
What royalty does Amazon pay self-published authors?
For ebooks priced between $2.99 and $9.99, you earn 70% minus a small delivery fee. Below $2.99 or above $9.99, you earn 35%. For print books, the royalty is 60% of list price (minus printing cost) for books priced at $9.99 or above, and 50% for books priced below that threshold, as of June 2025.
What is KDP Select and should I enroll?
KDP Select is a 90-day exclusivity program that puts your ebook in Kindle Unlimited and gives you access to promotional tools. It works well for high-volume genres like romance and fantasy where KU readers are active. It’s less ideal for non-fiction, literary fiction, or authors who want multi-platform revenue.
How many self-published books are on Amazon?
More than 1.4 million self-published books are released on Amazon each year. The total catalog of self-published titles numbers in the millions.
Can I sell self published books on Amazon and other platforms at the same time?
Yes, for print and audiobook editions. For ebooks, you must choose: enroll in KDP Select (Amazon exclusive) or go wide. You cannot have an ebook in KDP Select and sell it on Apple Books or Kobo simultaneously.
What is the biggest mistake new self-published authors make?
There’s no single answer, but the most costly mistake is treating publishing as the finish line. Without a marketing plan, professional packaging, and a strategy for reviews and discoverability, even a well-written book will go unnoticed. Building an email list early and planning a proper launch are the two highest-impact actions.
Publishing self published books on Amazon is more accessible than ever, but accessibility doesn’t mean simplicity. The terminology, royalty structures, distribution decisions, and marketing channels add up fast. If you’d rather have a professional team handle the details while you focus on writing, Alpaca Authors offers integrated publishing, marketing, and audiobook services with transparent pricing and full author ownership.