Some ways to tell if a book is self-published
LOOK AT THE PUBLISHER NAME (IMPRINT)
Self-published authors often use Amazon’s KDP (Kindle Direct Publishing) or other platforms like IngramSpark. If the book lists “Independently published,” “Amazon KDP,” or a personal imprint that doesn’t have a web presence beyond that author, it’s likely self-published.
Traditional publishers are usually recognizable names (Penguin Random House, HarperCollins, Simon & Schuster, etc.) or established independent presses.
CHECK THE ISBN
Traditionally published books almost always have an ISBN owned by the publishing house. If the ISBN is registered to the author, or to Amazon (sometimes you’ll see “Amazon Digital Services” as the publisher), it’s usually self-published.
DISTRIBUTION AND AVAILABILITY
Self-published books are often sold primarily online (Amazon, Barnes & Noble online) and may not be carried by physical stores unless the author has arranged it locally.
Traditional publishers distribute widely through bookstores, wholesalers, and libraries. You’ll find their books stocked in most major retailers.
PROFESSIONAL SIGNALS
Self-published books can range in quality — many are excellent, but others may show signs of amateur layout, inconsistent formatting, or weaker editing.
Traditional publishers invest in editing, design, and marketing. Covers tend to be polished, interiors are professionally typeset, and there are few typos.
PRICE AND FORMAT
Self-published books often appear only in paperback and ebook formats, sometimes at lower prices (though this isn’t always the case).
Traditional publishers often release hardcover first, then paperback. Pricing is typically higher.
RESEARCH THE PUBLISHER
If you see a company name you don’t recognize, look it up. If their website only lists the author’s books or offers paid publishing services, it’s probably a self-publishing imprint.