Greg Halpern Books

Harvard Works Because We Do

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"Since 1998, Greg Halpern has been photographing Harvard University's lowest-paid service workers - its custodians, security guards, and food-service employees - while at the same time collecting r...

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By Greg Halpern

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The photographer s playbook

By Mike Slack, Jason Fulford, Greg Halpern

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ZZYZX

By Gregory Halpern

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Omaha Sketchbook

By Gregory Halpern

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13 Lives

By Greg Halpern

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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.