Before converting a PDO file, understand the copyright.
This is the most frequent use case. A PDO file contains a 3D model and its "unfolded" 2D paper pattern. PDO File Extension - What is .pdo and how to open? pdo file converter
Key features to look for
Converting patterns to PDF for printing; Converting to vector images (BMP -> SVG via Illustrator). Before converting a PDO file, understand the copyright