Book page
Live nowA shareable profile page for your book — cover, blurb, buy links, retailer availability — generated from an ISBN or a title in under a minute.
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The specifics
other guides skip
Free tools and researched guides for publishing your book — no vague advice, no hidden sponsors.
01Tools
Cover mockup
Coming soonFlat cover art to a paperback, hardcover, or e-reader render at the exact dimensions retailers and press kits ask for.
02Guides — four topics
ISBN & registration
Single ISBNs: what the $125 fee actually gets you
And why a block of ten costs $295 — the arithmetic of buying more than you need.
Copyright
The copyright page, line by line
Seven lines that belong there, three that don’t, and the notice format courts recognize.
Amazon & KDP
KDP categories, from top-level to exact-match nodes
How to request the three you actually want, with the node strings to paste in.
Piracy & protection
DMCA takedowns: one bad listing to a sitewide sweep
The notice template, where to send it, and what to do when the host ignores you.
03Every guide ends with this
“A single ISBN costs $125. Ten cost $295. If you will ever publish a hardcover, a paperback, and an ebook of the same title, you have already needed three.”
From Single ISBNs: what the $125 fee actually gets you
ISBN & registration · Guide 04
§ Colophon
- Word count
- 3,842
- Last fact-checked
- 14 August 2026
- Primary sources cited
- 11
- Revisions since publication
- 3
No affiliate links · No sponsors · No paid placements
Checked against Bowker’s published fee schedule, ISBN.org’s registration terms, and each source’s own governing documents.
04About
If you have ever finished an article about ISBNs and still not known whether you needed one, this site is for you.
Most publishing advice is written to sell something — a formatting service, a course, a distributor with a referral fee. It stays vague on purpose, because the specifics would make the recommendation harder to defend. Colophon exists because we got tired of that. Every guide here names the fee, the form number, the deadline, and the exact wording, and every guide tells you where the answer came from so you can check it yourself.
Nobody pays us to say anything. If we get something wrong, write in and we will fix it, and the colophon will say we did.