Quba is a free, open-source e-invoice viewer for Windows, macOS, and Linux that displays XRechnung, Factur-X, ZUGFeRD, UBL, CII, and Peppol invoices offline, letting accountants and businesses read and check electronic invoices without uploading sensitive data.
Quba is a desktop application for opening and reading electronic invoices in the formats European businesses now exchange. Instead of printing a raw XML file or trusting a web portal, you drop an invoice into the viewer and see a laid-out document: seller and buyer details, line items, tax breakdowns, totals, and the payment terms that matter for approval. The same window handles structured XML files such as XRechnung, UBL, and UN/CEFACT CII, hybrid Factur-X and ZUGFeRD PDFs where the visual page and the embedded data sit side by side, and Order-X order documents. Everything runs locally on your machine, so nothing leaves your computer.
Businesses that receive e-invoices often need a quick way to check what a supplier actually charged before the document moves into their bookkeeping system. Quba answers that need without a subscription, because the viewer is free and open source. Because it also inspects the underlying data rather than only the rendered page, a reader can compare a printed-looking PDF against the numbers an automated system would import. Teams pairing this with tools such as Kasir POS keep the reading and checking stage separate from payment and stock handling, so a malformed invoice gets caught by a human before it reaches the till.
The clearest benefit is confidence. When an invoice arrives as data rather than as a picture, mistakes hide easily: a wrong tax rate, a duplicated line, a total that does not match the sum of its parts. Quba renders structured content into a familiar invoice layout, so anyone in the office can review it, not just a developer who knows how to read XML. Working offline is the second advantage. Invoices carry prices, bank details, and customer names, and there is no reason to send that material to a third-party website just to look at it. Keeping everything on the desktop also means the viewer keeps working when the connection does not. Support for many formats in one place removes the need to install a separate tool for each trading partner, and cross-platform builds mean colleagues on different operating systems see the same layout. Finally, being open source allows IT teams to audit the tool, build it themselves, and adapt the visualization to their own rules.
Key capabilities and highlights.
Opens XML invoices such as XRechnung, UN/CEFACT CII, and UBL alongside hybrid Factur-X and ZUGFeRD PDFs and Order-X order documents. One viewer covers the formats suppliers actually send, so reviewers do not have to install or learn a separate tool for each trading partner that changes its invoice output.
Shows the human-readable invoice page next to the extracted structured data in the same window, making it easy to spot a mismatch between what the document looks like when printed and what an automated bookkeeping system would import. Reviewers can slide the divider and confirm fields, tax rates, and totals line by line.
Processes every file locally with no upload step, keeping prices, bank details, and customer names inside the organization instead of on an external server. That matters for finance teams handling confidential supplier terms, and it means the viewer still works on a laptop with no usable network connection.
Checks invoices and orders against syntax rules and recalculates key amounts when an online validation service is reachable, reporting problems in a clear dialog instead of hiding them. This gives an approval step something concrete to act on before a flawed document is accepted into the accounting workflow.
Open several invoices at once by dropping files onto the window, passing them as arguments from a script, or working through tabs during a long review session. Handling a batch this way removes the repeated open-and-close cycle that slows down month-end checks.
A search function and an integrated handbook let reviewers jump straight to a specific field or look up a business term without leaving the application. That shortens onboarding for staff who are new to electronic invoices and reduces the back-and-forth with technical colleagues.
Prints the rendered invoice for filing or physical sign-off and previews embedded attachments such as images or PDFs inside the viewer. Support documents therefore stay visible next to the invoice they belong to, which is useful when a purchase order or delivery note is attached to the file.
Interface texts are available in several languages and coded field values are resolved into readable descriptions, so reviewers see what a code actually means instead of a bare identifier. This turns cryptic code lists into understandable invoice details and reduces misinterpretation during manual checks.
Browse historical releases and previous builds.
Common questions about Quba.
Quba is used to open, read, and check electronic invoices that arrive as data files or hybrid PDFs. It renders the underlying invoice content into a readable layout so staff can verify supplier details, line items, and totals before the document enters bookkeeping.
No. Reading and viewing invoices works fully offline. A connection only matters if you deliberately want to validate an invoice or order through a remote validation service.
It handles the formats common in European trade, including XRechnung, UN/CEFACT CII, UBL, Peppol invoices, and Factur-X or ZUGFeRD hybrid PDFs, plus Order-X order documents.
Yes. It is free and open source, so there is no licence fee or subscription for reading invoices, and organizations can review the code or build it themselves.
It can validate invoices and orders when an online validation service is available. That check examines the syntax and recalculates important amounts, and any issues are reported rather than silently ignored.
Not for viewing. Files are processed on your own machine. Data leaves the device only when you explicitly request online validation.
Yes. Desktop builds are provided for those platforms, including a Flatpak package, and the viewer interface behaves consistently across them.
Yes. Quba supports tabs, drag-and-drop, and opening files passed as command-line arguments, so a batch of incoming invoices can be worked through without closing and reopening the application.
Quba is a free, open-source e-invoice viewer for Windows, macOS, and Linux that displays XRechnung, Factur-X, ZUGFeRD, UBL, CII, and Peppol invoices offline, letting accountants and businesses read and check electronic invoices without uploading sensitive data.
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