E-Invoice Validator & Creator

XRechnung · ZUGFeRD

Validate, inspect, create and convert electronic invoices directly in ChatGPT.

XRechnung 3.0 and ZUGFeRD 2 / Factur-X, checked against the official rules.

What it does

ValidateChecks an uploaded XML or PDF e-invoice with the official KoSIT validator and returns rule codes such as BR-DE-15 with clear messages.

InspectTells you which format a file is (XRechnung, EN 16931, ZUGFeRD profile, CII or UBL) and reads number, dates, parties and totals.

CreateBuilds an XRechnung 3.0 as CII or UBL XML or as a ZUGFeRD PDF/A-3 from your invoice data. It is validated before you get it.

ConvertXRechnung CII → UBL, CII → ZUGFeRD PDF with a readable view, or extracts the XML from a ZUGFeRD/Factur-X PDF.

Supported formats

XRechnung 3.0 (UN/CEFACT CII and UBL, invoice and credit note)
EN 16931 (CII and UBL)
ZUGFeRD 2 / Factur-X: MINIMUM, BASIC WL, BASIC, EN 16931, EXTENDED, XRECHNUNG
PDF/A-3 with embedded XML

How it works

You upload the invoice in ChatGPT and ask for a check. ChatGPT passes the file to this plugin, which sends it over an encrypted tunnel to our validation server in Germany. The server runs the official validators and returns a structured result that ChatGPT explains to you.

How your data is handled

Invoices are processed only to answer your request and are not stored. They are held in memory for the duration of the check.
Invoices you create or convert are kept in memory for at most one hour so you can download them, then deleted. A server restart deletes them earlier.
Invoice content is never logged and never used for training. We only record technical usage data such as which function ran, whether it succeeded and how long it took.
Processing server: IONOS SE (data centre in Berlin, Germany) as our processor. Website and plugin hosting: Cloudflare.

FAQ

Is a “valid” result legal or tax advice?

No. It is a technical standards validation against EN 16931, XRechnung and ZUGFeRD rules. Whether an invoice meets all legal requirements (e.g. § 14 UStG) can depend on facts the file does not show.

Which validator is used?

KoSIT Validator 1.6.3 with the XRechnung 3.0.2 configuration (2026-08-31) for XRechnung and EN 16931, and Mustangproject 2.26.0 with veraPDF for PDF/A-3 and the other ZUGFeRD profiles.

Why is a ZUGFeRD MINIMUM or BASIC WL invoice flagged?

These profiles lack information required by EN 16931. In Germany they do not count as e-invoices (BMF letter of 15 October 2024).

Can it read plain PDF invoices?

No. A PDF needs an embedded e-invoice XML (ZUGFeRD/Factur-X). Scanned or plain PDFs are not e-invoices.

MCP endpoint

https://e-invoice.plugins.stosse.group/mcp