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E-Invoicing API

Generate, validate, convert and render 11 EU and national e-invoice formats — UBL, CII, Peppol, XRechnung, FatturaPA, Facturae, KSeF and more — behind one API key.

Try it live → Get your free API key

Generate Validate Convert Render

Generate in your browser — no code →

Pan-EU France Germany Italy Spain Poland Romania

Capabilities

Generate compliant XML (UBL/CII) or PDF (Factur-X) invoices from structured JSON.
Validate against the official rule sets — every finding with its rule ID.
Convert losslessly between UBL and CII, or embed/extract Factur-X.
Render a clean HTML/PDF view of any invoice, including the official KoSIT layout.

Where it fits

SaaS platforms bolting on e-invoicing without hiring a compliance team.
Accounting teams pre-flighting invoices before a Plateforme Agréée or Access Point.
Developers building a custom ERP or billing system on one format-agnostic engine.

What comes out

invoice.xmlUBL 2.1 / CII, structured JSON in

IN · UBL XML

OUT · PDF (also CII, Factur-X, PDF/A-3)

Try it live

Drag and drop your invoice file here — .xml or .pdf (Factur-X/ZUGFeRD)

Choose file No file chosen

Test here — paste your invoice XML (UBL or CII), or use our sample

Live call to the real validator · max 200 KB (XML) / 10 MB (PDF) · nothing is stored

Same engine as the full validator page — more profiles, plus a downloadable PDF report.

Doing this repeatedly? Automate it via the API →

Call it from your code

curl -X POST "https://api.crateapi.com/v1/generate/ubl?profile=peppol" \
  -H "X-API-Key: YOUR_KEY" -H "Content-Type: application/json" \
  -d @invoice.json -o invoice.xml

Read the docs →

Trust & data handling

Every demo on this page runs against the live engine. Uploaded files and pasted text are processed in memory and never written to disk; nothing about your request is stored. Details: Trust & Security.

Pricing

E-Invoicing pricing follows the platform grid — Free tier forever, paid plans from a few euros a month, no per-document lock-in. See the current numbers on the pricing section.

FAQ

Do you transmit invoices to Peppol, SDI, KSeF or FACe?

No — CrateAPI makes the document valid. Getting it onto the network stays with your existing Access Point or platform (yours, or a provider's).

Which formats are covered?

UBL 2.1/Peppol BIS 3.0, XRechnung, CII, RO_CIUS, Factur-X, FatturaPA, Facturae, KSeF, plus the EHF/NLCIUS/PINT profiles — see the full format list.

Is validation really free?

Yes, unmetered, no API key required — try it now. Generation, conversion and rendering need a free or paid key.

Ready to try it?

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Validate your e-invoice freeNo signup. Paste or upload, get the report instantly.

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