Quba-Viewer

Quba‑Viewer is an open‑source application that displays electronic invoices in a human‑readable format. It supports common e‑invoice standards such as ZUGFeRD 1, allowing users to view the content and semantics of invoices without needing to parse the underlying XML or PDF structures. The program runs on macOS, Linux and Windows, and includes features like search and drag‑and‑drop handling, with recent releases fixing printing and page‑order issues.

The tool is aimed at professionals and businesses that receive electronic invoices and need a straightforward way to inspect, validate, and verify the details visually. It complements a related project that focuses on automated extraction and validation by providing a dedicated viewer for manual review.

What distinguishes Quba‑Viewer is its cross‑platform availability, free licensing, and focus on presenting the invoice data clearly for semantic checking. The project is actively maintained, with regular updates that address platform‑specific bugs and add support for newer invoice formats.