# E-Invoicing Resources

Browse practical resources for electronic invoicing, from compliance guidance to format comparisons and reference pages.

## E-Invoicing Resources

Browse practical resources for electronic invoicing, from compliance guidance to format comparisons and reference pages.

## How to use this documentation

Pick a path by intent: understand a format (compliance guides), fix a validator error, look up a field or code list, or ship automation via the API. Use search (⌘K) to jump straight to a topic.

## When to start here

Start here when you first need to decide whether the next step is format selection, country routing, validator triage, or ERP integration. This page is meant to shorten that decision, not just list documentation.

## Choose your next path

### Compliance Guides
Step-by-step guides to XRechnung, ZUGFeRD, and EU compliance requirements

### Country Guides
Country-by-country basics: formats, routing, and recipient identifiers

### XRechnung Field Guide
Complete reference for XRechnung fields, business terms, and requirements

- convert
- validate
- api
- playground

## Featured Resources

- [Compliance Guides](/resources/compliance) (8+ Standards): Step-by-step guides to XRechnung, ZUGFeRD, and EU compliance requirements
- [EU E-Invoicing](/resources/eu) (4 Guides): Long-form guides for the largest EU markets and delivery models (PEPPOL, portals, clearance)
- [Country Guides](/resources/countries) (10+ Countries): Country-by-country basics: formats, routing, and recipient identifiers
- [Glossary](/resources/glossary) (40+ Terms): Clear definitions of e-invoicing terms, standards, and validation concepts
- [Code Lists](/resources/code-lists) (6+ Lists): Common code lists for e-invoices: VAT categories, payment means, units, and more
- [ZUGFeRD Profiles](/resources/zugferd/profiles) (5 Profiles): Choose the right ZUGFeRD/Factur-X profile, from MINIMUM to EXTENDED
- [XRechnung Field Guide](/resources/xrechnung) (165+ Fields): Complete reference for XRechnung fields, business terms, and requirements
- [KOSIT Validator Errors](/resources/kosit-validator-errors) (21+ Errors): KoSIT validation errors and how to fix them
- [Tool Comparisons](/resources/comparisons) (2+ Comparisons): Compare Invoice-Converter with alternatives such as PDF24 and sevDesk
- [Trust & Security Center](/resources/trust-center) (Updated 2026): Security, privacy, and data-handling details for Invoice-Converter.com
- [External API Documentation](/developer-api) (V1 contract): Closed beta API contract documentation for approved partner IT review, including decisions and onboarding checklist.

## Recommended starting points

Use these shortcuts when you already know the task you need to finish this week.

- [Compliance Guides](/resources/compliance)
- [Country Guides](/resources/countries/de)
- [KOSIT Validator Errors](/resources/kosit-validator-errors)