Frank Koolen Books

A 21st century mirage

By Frank Koolen, Paul Segers, Oscar Larik

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A 21st. Century Mirage focuses on Segers' drawing process in developing his sculptural works, performances and video's. This extensive view into the mind of the artist is insightful, funny and intr...

Painted Bird. Dreams and Nightmares of Europe

By Gijs FRIELING, Frank Koolen, Mirthe Kluck, Natasja Kensmil, Klaas Kloosterboer

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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.