E-Invoice Viewer - Klarbon

Klarbon is an e-invoice viewer for XRechnung, ZUGFeRD and Factur-X: it turns the e-invoice into a readable invoice instead of XML text. Open XRechnung (CII and UBL, including credit notes) and ZUGFeRD / Factur-X straight from your mail or file app, read everything clearly and check the e-invoice with a traffic light. Everything works offline on your phone.

OPEN AN E-INVOICE WITH ONE TAP
Open XRechnung files: tap "Share" or "Open with" in your mail or file app and pick Klarbon, or choose the file inside the app. For ZUGFeRD and Factur-X, Klarbon reads the XML from the PDF itself. Nothing to unpack, no account.

A READABLE VIEW INSTEAD OF XML
Seller, buyer, invoice number, date, due date, all line items, VAT breakdown, totals, payment details with IBAN and payment reference, notes and attachments, laid out the way you want to read an invoice. One tap on the IBAN, amount, payment reference or invoice number copies the value, for example into your banking app.

CHECK THE E-INVOICE WITH A TRAFFIC LIGHT
Klarbon checks the most important business rules of EN 16931 and XRechnung offline, with its own implementation. The traffic light shows green, warning or error at once, with the number of errors and warnings and the first finding in plain language. You see quickly whether something is wrong with an e-invoice before you process it.

FREE - NO ACCOUNT, NO HURDLE
• View every e-invoice (XRechnung, ZUGFeRD, Factur-X)
• Copy single values with a tap: IBAN, amount, payment reference, invoice number
• Quick check with traffic light, number of errors and warnings and the first finding
• History of the last 3 invoices
So you can view e-invoices for free as often as you like. Free with light ads; Pro removes all ads.

KLARBON PRO
• No ads anywhere in the app
• Full check report with all findings, rule ID (EN 16931 / XRechnung BR-DE) and explanation
• Export as a readable PDF (view and check report) to forward
• Copy all line items and totals as a table or share them as CSV
• Unlimited history with search
• Batch import of several files with a traffic-light list
Pro is available monthly or yearly; Google Play shows the price in your currency. There is no trial. Cancel any time in Google Play.

YOUR INVOICES STAY ON YOUR DEVICE
Klarbon works fully offline. Your invoices never leave the device and there is no account. The app uses the network for Google Play Billing, for anonymous usage counters without a device or user ID (for example app start, Pro page seen, purchase steps) and, in the free version, for ads via our ad partners, personalized only with your consent. See the privacy policy for details.

WHY E-INVOICES? THE LAW (GERMANY)
Receiving e-invoices in domestic B2B has been mandatory since 1 January 2025. Issuing them becomes mandatory from 2027 if the previous year's turnover exceeded EUR 800,000, and from 2028 for everyone (section 27 (38) UStG). Sources:
Section 27 (38) UStG, wording in the Growth Opportunities Act (Bundestag printed paper 20/10410, p. 18 f.; BGBl. 2024 I No. 108): https://dserver.bundestag.de/btd/20/104/2010410.pdf
XRechnung standard (KoSIT): https://xeinkauf.de/xrechnung/
EN 16931 / Directive 2014/55/EU: https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX:32014L0055

IMPORTANT
Klarbon is a viewing and checking tool. It checks the most important business rules of EN 16931 and XRechnung with its own implementation and replaces neither the official KoSIT validation nor tax advice. For tax questions, please ask your tax adviser. Klarbon is not a government app and is not affiliated with any authority.

For everyone who receives e-invoices: freelancers, offices, bookkeeping and clubs. E-invoice viewer, ZUGFeRD reader and e-invoice check in one app. Open XRechnung and Factur-X files on your phone.

Questions? [email protected]