Volker Lorenz Menze Books

Center province and periphery in the age of Constantine VII Porphyrogennetos

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"This comprehensive volume offers new insights into a seminal period of medieval Eastern Roman imperial history: the rule of Constantine VII Porphyrogennetos (913/945-959). Its fifteen chapters are...

Justinian and the Making of the Syrian Orthodox Church

By Volker Lorenz Menze

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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.