Turn your invoices into Peppol-compliant XML — before it becomes mandatory.

Slovakia requires structured EN 16931/UBL2.1/Peppol e-invoicing for B2B from 1 January 2027. Check and convert your invoices yourself, no sales call needed.

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Check compliance instantly

Paste or upload an invoice and get a plain-language report of exactly which mandatory rule it fails, in Slovak or English.

Get a real Peppol XML file

A valid invoice converts to EN 16931 / UBL 2.1 / Peppol BIS Billing 3.0 XML, ready to hand to your access-point provider.

Simple API, no sales calls

One API key, two endpoints, JSON in. Built for developers and the accountants/SMBs who need this before the 2027 deadline.

Slovak Law 385/2025 Z.z. makes structured e-invoicing voluntary from May 2026 and mandatory for domestic VAT-registered B2B/B2G transactions from 1 January 2027.

Example: validate an invoice via the API

curl -X POST https://einvoicing.bluezero.sk/v1/invoices/validate \
  -H "Authorization: Bearer <your_api_key>" \
  -H "Content-Type: application/json" \
  -d '{
    "invoice_number": "INV-2026-0001",
    "issue_date": "2026-09-06",
    "currency_code": "EUR",
    "seller": {"name": "Acme s.r.o.", "vat_id": "SK1234567890", "country_code": "SK"},
    "buyer": {"name": "Beta s.r.o.", "vat_id": "SK9876543210", "country_code": "SK"},
    "lines": [{"description": "Consulting", "quantity": 1, "unit_price": 500, "vat_rate": 20}]
  }'