Roger Johnson Books

Exploring the fascinating and enigmatic world of Sherlock Holmes, this miscellany examines his place in literary history, his popularity, and how he has become the iconic, timeless character who is...

Incredible Legend of the Golden Years

By Roger Johnson

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Mammoth Books Presents the Adventure of the Grace Chalice

By Roger Johnson

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Tooth for an Eye

By Roger Johnson

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How to Convert ISBN-10 to ISBN-13 (and Vice Versa): A Complete Guide

If you’re in the world of books—whether as a publisher, librarian, bookseller, or avid collector—you’ve likely come across the terms ISBN-10 and ISBN-13. Understanding these formats and knowing how to convert between them is essential for maintaining consistency and compatibility in book records. In this post, we’ll cover everything you need to know about ISBN conversions, step by step.

What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.