Which free e-invoice viewer should you use?

Five free tools make an XML e-invoice readable: Quba, an open-source desktop viewer; Media Atelier's InvoiceViewer and Klarbon, which read the file in your browser; and B2Brouter and einvoicechecker.com, which validate it on their servers as they show it. The right one depends on whether you will install software, whether the file may leave your device, and whether you need a validation result too.

Every fact about another tool comes from its own page, read on 7 November 2026. Where a page does not say something, the table says "not stated", not a guess.

How do the five viewers compare?

"Not stated" means the provider's page does not say. Klarbon's facts come from its own tool pages; the data path is described in what happens to my files.

When is Quba the right choice?

When you open many e-invoices on one computer and want to stay offline. Quba is open source, free and runs on Windows, Linux and Mac (Quba). The project says it reads XRechnung, Factur-X/ZUGFeRD, PDF, Order-X, CII and UBL (Quba 1.5.0). Since version 2.0 of 15 October 2026 it also validates offline and creates Factur-X/ZUGFeRD files when you have a PDF/A base file (Quba 2.0). You need rights to install software; the project notes that its Windows installer is not yet digitally signed.

When is Media Atelier's InvoiceViewer the right choice?

When you receive UBL or CII and want a quick look in the browser without the file leaving your computer. The page says all processing happens locally in your browser and no data is sent to any server, and it lists UBL and CII as the supported formats (Media Atelier). It displays the invoice; for conformance, the page points to a separate validator.

When is B2Brouter the right choice?

When you want the view and a validation result in one step, across many formats. B2Brouter's viewer needs no registration to view, shows the invoice in a readable layout and highlights structure or syntax errors; it lists UBL, Peppol BIS and PINT profiles, ZUGFeRD, XRechnung, Factur-X, FacturaE, Svefaktura, FatturaPA and eSPap (B2Brouter). You upload the file to B2Brouter, and a PDF copy needs a free account. B2Brouter is also a Peppol access point, if you later want to send and receive e-invoices.

When is einvoicechecker.com the right choice?

When you want a view, a validation result and the data as JSON from the same page. It reads XRechnung, ZUGFeRD, Factur-X, Peppol BIS 3.0, UBL, CII, KSeF FA(3), Facturae and more, validates against EN 16931 and national rules such as KoSIT for XRechnung, and says files are parsed in memory on its server and discarded as soon as the response is sent. It describes the viewer and validator as free without limits for manual use (einvoicechecker.com).

When is Klarbon the right choice?

When you want to open an invoice on any device, including a phone, without installing anything or uploading the file. The e-invoice viewer reads the file in your browser, needs no account and has no limit, and you can save a readable PDF through Print. The interface is in ten languages. Validation is a separate step: Check runs EN 16931 and the rules for the declared specification, in beta, free within a daily limit; it sends the file to Klarbon's servers and deletes it after the request. Klarbon is not an access point and does not send invoices.

What no viewer replaces

A readable view says nothing about validity or retention. An invoice can look complete and still fail a rule, so check it before you send or book it. Keep the XML file as the invoice; a PDF made from a viewer is a copy. For the difference between the two, see PDF or e-invoice.

Related

• Open an e-invoice
• Check an e-invoice
• Peppol or UBL?
• Free Peppol validators compared