# Knowledge base about UBL and e-invoicing

The SnelUBL knowledge base provides practical answers about UBL, PDF conversion, Peppol and e-invoicing in the Netherlands and Belgium. The articles distinguish between a readable source file, structured UBL XML, accounting software and the infrastructure used to exchange an e-invoice.

## Start with your question

| Question | Article |
|---|---|
| What is a UBL file? | [What is UBL?](/en/ubl.html) |
| Which version or profile do I need? | [UBL 2.1 vs UBL 2.3 vs Peppol BIS 3.0](/en/ubl-vs-peppol.html) |
| How do I convert a PDF? | [Convert a PDF invoice to UBL](/en/pdf-to-ubl.html) |
| Can I use a photo or scan? | [Invoice photo or scan to UBL](/en/invoice-photo-scan-to-ubl.html) |
| What is Peppol? | [Peppol explained for businesses](/en/peppol-explained.html) |
| What applies in Belgium? | [E-invoicing in Belgium since 2026](/en/e-invoicing-belgium-2026.html) |
| What is the Dutch plan for 2030? | [Mandatory e-invoicing from 2030](/en/e-invoicing-netherlands-2030.html) |
| Am I looking for a Go2UBL alternative? | [Go2UBL alternative](/en/go2ubl-alternative.html) |

## Practical tools

- [Free UBL validator](/en/ubl-validator.html): a local basic check in your browser.
- [Check a UBL file](/en/check-ubl-file.html): a checklist for fields and amounts.
- [Invoice requirements in the Netherlands](/en/invoice-requirements-netherlands.html): data relevant to invoice processing.
- [Accounting packages](/en/#accounting-packages): SnelStart, Exact Online, AFAS, Moneybird, e-Boekhouden.nl, Twinfield and Yuki.
- [Documentation](/en/documentation.html): guides for Quick Mode, workflows and integrations.

## The Netherlands and Belgium

E-invoicing to Dutch government organizations is already required. The Dutch government plans mandatory B2B e-invoicing from 1 July 2030; the law has not yet been enacted. In Belgium, B2B e-invoicing through Peppol has been mandatory since 1 January 2026.

SnelUBL helps when a supplier still sends a PDF, DOCX, scan or photo. The source is converted to UBL 2.1 or UBL 2.3, and you can review and correct the data before export.

## Frequently asked questions

### Where should I start if I only have a PDF invoice?

Read [Convert a PDF invoice to UBL](/en/pdf-to-ubl.html) and test the process with one of the first 3 free conversions.

### Can I check here whether my UBL file is fully Peppol compliant?

No. The free validator provides a basic check and does not claim full EN 16931 or Peppol BIS Billing 3.0 Schematron validation.

### Which UBL versions does SnelUBL support?

SnelUBL creates UBL 2.1 and UBL 2.3 and validates the output before export.

### Can I automate invoice processing?

Yes. Workflows support a dedicated inbox, automatic attachment detection, status emails, cloud folders and API access.

### Where can I find information for accountants?

See [SnelUBL for accountants](/en/for-accountants.html) for multiple clients, organization hierarchy, batches and central billing.

Last updated: 2 October 2026.