# 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
Requirements for XRechnung, ZUGFeRD, and EU e-invoicing

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

### XRechnung Field Guide
XRechnung business terms, field requirements, and examples

- [Convert invoice](/en/pdf-to-xrechnung)
- [Validate XML](/en/xrechnung-validator)
- [Developer API](/en/developer-api)

## Featured Resources

- [Compliance Guides](/resources/compliance) (8+ Standards): Requirements for XRechnung, ZUGFeRD, and EU e-invoicing
- [EU E-Invoicing](/resources/eu) (4 Guides): Country requirements and delivery models such as Peppol, portals, and 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): XRechnung business terms, field requirements, and examples
- [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) (Security details): Security, privacy, and data-handling details for Invoice-Converter.com
- [External API Documentation](/developer-api) (V1 contract): Self-service API contract documentation for invoice automation teams, 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)