Serge Onnen Books

I am a lone monk walking in the world with a leaky umbrella

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The shadow puppet theater is the oldest form of projected moving images. These semi-transparent puppets are made of tanned animal skins which are stained with ink, and are traditionally played with...

Drawings on Writing

By Serge Onnen

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Drawings on Hands

By Serge Onnen

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The lost cent

By Serge Onnen

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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.