E‑Rechnungs-Studio
E-Rechnungs-Studio is a German web app for creating, converting, validating and viewing electronic invoices.
Users can upload an existing invoice PDF and convert it into an EN 16931-compatible e-invoice, including XRechnung and ZUGFeRD. The tool also includes an online validator for XRechnung XML files and ZUGFeRD PDFs, plus a viewer that makes structured invoice data readable.
It is designed for small businesses, freelancers, agencies, service providers and companies in Germany that need to handle individual e-invoices without installing full accounting software.
Core functions include PDF to XRechnung conversion, PDF to ZUGFeRD conversion, XRechnung validation, ZUGFeRD validation and readable e-invoice viewing.
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xSuite
E-invoicing is gathering momentum all over the world. With Interface E-Invoice, you’ll be all set for this transformation. Our solution gathers incoming XML invoices, captures their content, and automatically transfers the relevant information into the appropriate fields of your ERP system. For convenient further processing, the machine-readable document is also converted into an easy-to-read PDF. With Interface E-Invoice, you don’t have to choose between XRechnung and ZUGFeRD, as the solution supports both formats. It also supports PEPPOL BIS Billing 3.0 (which is standard in several European countries), the French Factur-X format, and InvoiceNow from Singapore. Other formats are currently being prepared.
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InvoiceXML
InvoiceXML is an API-first platform for European e-invoice compliance. A single REST API generates, validates, and converts every major format covered by EN 16931: Factur-X, ZUGFeRD, XRechnung, UBL, and CII.
Generation accepts clean JSON input and returns a compliant XML document, or a PDF/A-3 hybrid invoice with the XML embedded according to format-specific rules. Validation runs the official Schematron rulesets, and returns structured results plus user-friendly plain-language explanations alongside the raw rule output.
Format conversion (POST /v1/convert/{from}/to/{format}) maps any supported format to any other through a canonical internal representation. A separate /v1/transform/ namespace handles AI-assisted extraction from legacy PDF invoices into structured XML.
No-Code integrations expose the core operations to non-developers. MCP server provides the compliance toolkit for AI Agentic workflows. Always up to date with the latest standard requirements - zero maintenance.
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Clozo
Clozo is an EU-first billing tool for freelancers: send a professional proposal with a legally-binding e-signature, collect a deposit, and get paid in one link via Stripe (card/iDEAL/Bancontact) or SEPA. It validates client EU VAT live (VIES), applies cross-border reverse-charge automatically, and generates compliant e-invoices in one click — ZUGFeRD, Factur-X, Peppol UBL, FacturaE, ebInterface, FatturaPA. Plus recurring billing, time tracking, expenses with DATEV export, and GDPR data export. Built for EU freelancers and micro-studios who want proposals, signatures, invoices, payments and expenses in one place instead of four separate tools.
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