Ryuho Okawa Books

Challenge of the Mind

By Ryuha Okawa, Ryuho Okawa

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The Challenge of Enlightenment: Realize Your Inner Potential

By Ryuho Okawa

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Change your life change the world

By Ryuho Okawa

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We all have the power to work as God's angels, even as we live on earth. True and lasting happiness is not to be found within the material world but rather in acts of unconditional and selfless lov...

The Moment of Truth

By Ryuho Okawa

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Invincible Thinking

By Ryuho Okawa

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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.