Ryan Portillo Books

Carrion Crown: The Haunting Of Harrowstone

By Steve Ellis, Kieran Yanner, F. Wesley Schneider, Tyler Walpole, Dave Rapoza, Brandon Hodge, Patrick Renie, Jared Blando, Adam Daigle, Michael Kortes, Damien Mammoliti, Jean Baptiste Reynaud, Craig J. Spearing, Ryan Portillo, Emile Dennis

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Dead Man Walking When Harrowstone Prison burned to the ground, prisoners, guards, and a host of vicious madmen met a terrifying end. In the years since, the nearby town of Ravengro has shunned the...

Pathfinder Campaign Setting: Irrisen - Land Of Eternal Winter

By Robert Lazzaretti, Daren Bader, Ekaterina Burmak, Paizo Staff, Mike Shel, Dave Allsop, Eric Braddock, Ryan Portillo, Maichol Quinto, Robbie Trevino

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Far to the north lies a realm that the seasons never touch, where snow lies heavy on the ground all year and winter never releases its icy grip. A country ruled by White Witches with hearts as cold...

Demons Revisited

By James Jacobs, Paizo Staff

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Pathfinder Roleplaying Game

By Paizo Staff

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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.