ZUGFeRD Generator Comparison 2026: API, Library, or Office Suite?

What this page is

This is a buyer's guide for ZUGFeRD generator tools in 2026. Instead of comparing just one provider, we look at the whole landscape: managed API services, open-source libraries, office suites, free online tools. Goal: help you make the right choice for your use case — even if that's not invoice-api.xhub.

ZUGFeRD primer (in 30 seconds)

ZUGFeRD isn't a standalone format — it's a combination of two standards:

1. PDF/A-3 (ISO 19005-3): an archive-grade PDF that allows attachments
2. CII XML (UN/CEFACT Cross-Industry Invoice): the structured XML with invoice data

ZUGFeRD = PDF/A-3 + embedded CII XML. The recipient sees a normal invoice as PDF but can simultaneously parse the structured data programmatically. This solves the problem that many recipients still don't have pure XML processing — they just see the PDF.

ZUGFeRD exists in multiple versions (1.0, 2.0, 2.1, 2.2, 2.3) and three profiles (BASIC, COMFORT, EXTENDED). Most tools today target ZUGFeRD 2.3 with COMFORT profile — the sweet spot for B2B invoices.

What to look for

Before tool selection, clarify 5 questions:

1. Stack: do you have a Java backend? PHP? TypeScript? — determines library options
2. Self-host vs managed: do you need strict-local data, or is a vendor service ok?
3. Volume: how many ZUGFeRD PDFs per month?
4. Profile: is COMFORT enough, or do you need EXTENDED?
5. International: only Germany, or also Factur-X for France?

These 5 answers usually lead to the right architecture choice.

Architecture options

Option 1: Managed API service (e.g., invoice-api.xhub)

• How it works: REST call with JSON data, ZUGFeRD PDF returned
• Pro: no setup, no hosting, automatic compliance updates, multi-country
• Con: vendor lock-in, monthly cost, external API calls
• Ideal for: SaaS backends, fast prototyping, multi-country use cases

Option 2: Open-source library (e.g., Mustang Project, ferd-php)

• How it works: integrate library into your own stack, generate ZUGFeRD locally
• Pro: free, fully controlled, no vendor lock-in, no external calls
• Con: setup effort, own maintenance, stack-specific (Java/PHP), no multi-country
• Ideal for: Java/PHP teams with engineering capacity, high volume, strict data protection

Option 3: Office suite with ZUGFeRD function (e.g., Lexware, sevDesk, easybill)

• How it works: web UI for invoice creation, ZUGFeRD export as a feature
• Pro: all-in-one with dunning, bank reconciliation, etc.
• Con: not optimized for programmatic use cases; API is an office side feature
• Ideal for: solopreneurs, small teams without dev capacity

Option 4: Free online tool (e.g., eu-rechnung.de, xrechnungs.de)

• How it works: fill out web form, download ZUGFeRD PDF
• Pro: free, no signup, instantly usable
• Con: manual, no API, often only BASIC profile, no volume scaling
• Ideal for: one-off manual creation, test validation

Top picks by use case

Pick A: You need ZUGFeRD programmatically in your own product

→ invoice-api.xhub. API-first, free tier for testing, multi-country, EXTENDED profile, standalone validator. Time-to-First-Invoice under 5 minutes.

Alternative: Mustang Project (if Java stack present, self-host requirement, DE-only). See /compare/mustang-project-alternative.

Pick B: You have a Java codebase and engineering capacity

→ Mustang Project. Open-source, free, EXTENDED profile, active community. Trade-off: 1–3 days setup, your own compliance update maintenance.

Alternative: invoice-api.xhub on Enterprise plan (On-Premise/Hybrid) if you need multi-country but must host locally.

Pick C: You need an office suite with bookkeeping + ZUGFeRD

→ Lexware or sevDesk (DE) or easybill (DE solopreneur focus). E-invoicing is part of the office suite, but the main need is bookkeeping workflow.

See full comparisons: /compare/lexoffice-alternative, /compare/sevdesk-alternative, /compare/easybill-alternative.

Pick D: You need a PHP-specific library (self-host)

→ ferd-php as open-source library. Smaller community than Mustang, but the direct match for PHP stacks. Trade-off: maintenance, BASIC/COMFORT profiles (no EXTENDED out-of-the-box).

Provider profiles

invoice-api.xhub (managed API service)

• Strength: programmatic ZUGFeRD generation in 5 min, multi-country, language-agnostic
• Format coverage: ZUGFeRD 2.3 COMFORT + EXTENDED, plus 13 other EU hybrid formats (Factur-X, etc.)
• Pricing: Free 20/mo · Starter €23/mo (2k) · Premium €79/mo (20k) · Enterprise Custom
• Additional endpoints: standalone Validator (KoSIT, 187ms), Parser API for incoming ZUGFeRD PDFs

Mustang Project (Java open-source library)

• Strength: free, self-hosted, EXTENDED profile, active community, no vendor lock-in
• Format coverage: ZUGFeRD 2.x BASIC, COMFORT, EXTENDED + XRechnung (DE focus)
• Pricing: free (hosting/maintenance on your own)
• Stack: Java only

Lexware (office suite with API)

• Strength: all-in-one DACH bookkeeping, DATEV integration, ZUGFeRD from COMFORT
• Format coverage: ZUGFeRD 2.x BASIC + COMFORT (DACH focus)
• Pricing: Office plans from ~€8/mo, Office Pro from ~€39/mo
• API: REST API available, but office-centric

sevDesk (office suite with API)

• Strength: similar to Lexware, slightly more modern REST API, transparent pricing
• Format coverage: ZUGFeRD 2.x BASIC + COMFORT (DACH focus)
• Pricing: Office plans from ~€9–37/mo
• API: REST with OAuth, similar to Lexware

ferd-php (PHP open-source library)

• Strength: PHP-native, open-source, free
• Format coverage: ZUGFeRD BASIC + COMFORT (no EXTENDED out-of-the-box)
• Pricing: free
• Stack: PHP only, smaller community than Mustang

Decision tree

1Do you need ZUGFeRD programmatically (API call, no office UI)?
2├── Yes
3│   ├── Multi-country (FR Factur-X, IT FatturaPA)?
4│   │   ├── Yes → invoice-api.xhub
5│   │   └── No, DE only
6│   │       ├── Java stack + self-host? → Mustang Project
7│   │       ├── PHP stack + self-host? → ferd-php
8│   │       └── Other stack OR managed desired → invoice-api.xhub
9│   └── EXTENDED profile desired?
10│       ├── Yes → Mustang or invoice-api.xhub
11│       └── No, COMFORT enough → all options
12└── No, I need an office UI
13    ├── DACH solopreneur → Lexware / sevDesk / easybill
14    ├── Tax-advisor DATEV handoff required → DATEV (or Lexware with DATEV bridge)
15    └── One-off manual → free online tools

Recommendation

If you came to this page because you googled "ZUGFeRD generator," the answer is probably:

• API use case: invoice-api.xhub. Free tier, monthly cancellable, multi-country, no setup.
• Java stack with self-host: Mustang Project — the established de-facto standard.
• PHP stack with self-host: ferd-php — smaller community, but direct PHP stack match.
• Office use case: Lexware or sevDesk — all-in-one with ZUGFeRD export.
• One-off manual: free web generators for one-off cases.

The decisive question: what's your main need? ZUGFeRD generation as an API call in your product, or office workflow with ZUGFeRD as a side feature? The answer almost always leads to the right choice.

Next step

A 5-minute test in the playground shows faster than any comparison table whether invoice-api.xhub fits your setup:

• Generate a sample ZUGFeRD PDF from a JSON body
• Validate it against the KoSIT schemas
• Convert XRechnung XML into a ZUGFeRD PDF/A-3
• Browse the n8n workflow template

Free tier: 20 invoices/month, no credit card. If you scale beyond that, the Starter plan begins at €23/month (or €18/month with annual billing) and includes 2,000 invoices.