Chad Helder Books

Unspeakable horror

By Vince A. Liaguno, Chad Helder

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Plan 9 From Outer Space Strikes Again

By Darren G. Davis, Giovanni P. Timpano, Chad Helder

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Vincent Price Presents

By Bang Thai, Darren Davis, Chad Helder

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Vincent Price presents

By Darren G. Davis, Chad Helder

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The Gothic horror tradition of film icon Vincent Price is revived in these twisted comic book one-shots that transplant the best of the horror genre into innovative and bizarre landscapes for a new...

Pop up book of death

By Chad Helder

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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.