ISBN checker and converter
Validates the check digit on an ISBN, converts between the 10 and 13 digit forms, and formats it the way a copyright page should show it.
Check an ISBN
Check a list
This ISBN
ValidDoes the check digit agree–
13 digit formWhat a barcode carries–
10 digit formBlank for 979 prefixes, which have none–
Registration group–
How it is put together
Also for production
All tools →
Spine Width Calculator
Building a cover wrap that will not be rejected at upload.
Cover Template
Handing a designer the exact canvas instead of a page count and good luck.
Copyright Page
The page nobody remembers until the file is being uploaded.
Audiobook Estimator
Deciding whether the audio edition pays for itself.
Tools will only take you so far
Send what you have. Even a half-written manuscript is enough for a reader to tell you what it needs.