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Ultramarin eRechnung Viewer is a lightweight Windows utility developed by Alexander Spieß that addresses the growing need to display electronic invoices issued in the German XRechnung format. Positioned within the Business & Productivity / Document Viewers category, the program provides a straightforward graphical interface for opening and inspecting XML-based XRechnung files without requiring the user to possess specialized accounting or EDI software. Its single purpose is to render the structured invoice data—such as supplier details, line items, tax breakdowns, payment information and digital signatures—in a human-readable layout, making it immediately accessible to accounting clerks, freelancers, small-business owners and public-sector employees who must verify incoming e-invoices before booking or archiving them. Because XRechnung is mandated for all federal contracting authorities in Germany and is increasingly adopted by municipalities and private companies, the viewer serves as a quick validation tool that complements any ERP or invoicing workflow. Version 1.1, the only release published to date, focuses on core stability and accurate parsing of the CIUS (Core Invoice Usage Specification) and extension schemas defined by the German administration, ensuring that even complex invoices with multiple allowances, charges or references are displayed correctly. The application launches rapidly, requires no installation routine, and leaves no traces in the registry, so it can be carried on a USB stick for mobile use. By translating technical XML content into a concise visual replica of a conventional paper invoice, Ultramarin eRechnung Viewer reduces training effort and helps organizations meet legal transparency obligations while keeping their software stack minimal. The software is available for free on get.nero.com, with downloads provided via trusted Windows package sources (e.g. winget), always delivering the latest version, and supporting batch installation of multiple applications.
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