Peppol BIS 3.0 invoice validator
Validate a Peppol electronic invoice (UBL XML): the mandatory fields of the EN 16931 standard, the Peppol BIS Billing 3.0 rules, and the consistency of the totals and the VAT. From 1 January 2026, Belgian B2B e-invoicing goes mandatory, and a clean error report tells you exactly what to fix. The invoice XML is analysed on your device, so a draft invoice never leaves your machine.
- 100% local
- Free · no account
- Instant result
This tool runs entirely in your browser — nothing is sent to a server.
Since 1 January 2026, structured e-invoicing has been mandatory between VAT-registered businesses in Belgium, via the Peppol network and the Peppol BIS Billing 3.0 format (UBL XML compliant with the European EN 16931 standard). An invoice rejected by the network means a delayed payment — better to validate it before sending.
This validator analyses your XML file and checks the key rules: mandatory fields (number, dates, parties, lines), Peppol addressing (EndpointID and EAS schemes), VAT categories and above all the arithmetic consistency of the totals (sum of lines, VAT breakdown, amount due). Each issue is reported with the official rule identifier (BR-xx, PEPPOL-EN16931-Rxxx) and an explanation.
How it works
Type the figures or drop the file you want to process — the tool checks them as you go.
Everything is computed directly in your browser. Nothing is sent to a server.
The result appears instantly, with the detailed breakdown ready to copy, download or keep.
Why use this tool
No account, no download, no limit: the result appears as soon as you enter your data.
Every rule, algorithm and check reflects what we use ourselves every day at Flexina.
The calculations follow the official standards, and the step-by-step detail lets you double-check the outcome.
What does running it locally bring you?
Files, figures and documents never leave your device: nothing is stored, nothing is sent.
Once the page is loaded, you can cut the network: the tool keeps working.
No upload, no account, no third-party server in between: results stay fast and fully private.
Frequently asked questions
Does this tool replace the official Schematron validation?
No. Official validation covers several hundred rules; this tool checks the most important ones — those that cause the vast majority of rejections. For certified compliance, then pass through a Peppol access point or a full Schematron validator.
Which file formats are accepted?
UBL 2.1 XML files of type Invoice or CreditNote, as exchanged on the Peppol network (BIS Billing 3.0 profile). For Factur-X PDFs, a dedicated tool is planned.
What do the BR-xx and PEPPOL-EN16931-Rxxx codes mean?
They are the official business rule identifiers: BR-xx and BR-CO-xx come from the EN 16931 standard, the PEPPOL-EN16931-Rxxx rules are Peppol-specific. Citing them makes the dialogue with your software publisher easier.
Is my invoice sent to a server for validation?
No, the analysis is performed entirely in your browser. Your invoice — and the data it contains — never leaves your device.