Business documents & regulated formats

Invoices, payment files and customs data — where a format error means not getting paid.

🔒 Every tool here runs in your browser — your files never leave it.

E-invoicing 5
Bookkeeping & audit trail 1
Company identifiers 1
Payment references 1

E-invoicing 5

Documents that get rejected for their shape before anyone reads the amount.

Peppol Invoice Checker

Check a UBL invoice against the published Peppol BIS Billing 3.0 rules - reported under their official identifiers so every finding can be looked up.
Origin Declaration Checker

Compare the preferential origin declaration on your invoice against the wording EU law prescribes - word for word, in every prescribed language.
Supplier's Declaration Checker

Pick the right one of the four prescribed supplier's declarations, and check a long-term validity period against the limit the annex actually states.
E-Invoice Identifier

Tell UBL from CII, read the CustomizationID, and find out which profile an e-invoice declares - Peppol, XRechnung or the EN 16931 core - before you validate it.
XRechnung Checker

Check a German XRechnung invoice against KoSIT's official BR-DE rules, in UBL or CII, reported under their official identifiers.

Bookkeeping & audit trail 1

The sequences and references a tax authority expects to be unbroken.

Invoice Number Sequence Checker

Find the missing and duplicated numbers in an invoice column - with independent series split apart, so two healthy sequences are not reported as gaps.

Company identifiers 1

Codes that say which legal entity you are — and what a well-formed wrong one costs.

LEI Checker

Check the structure and check digit of a Legal Entity Identifier - and see plainly what a passing check digit does not prove.

Payment references 1

The structured codes that let an incoming payment reconcile itself against the right invoice.

RF Creditor Reference Checker

Check an ISO 11649 RF creditor reference - the structured payment reference on European invoices - including the mod-97 check digit IBAN uses.

Why the rule numbers here are not ours

Business document formats are unusual in that they publish their own numbered rules. Peppol BIS Billing 3.0 has 979 of them — BR-01, UBL-CR-002, PEPPOL-EN16931-R001 — each with a description and a severity.

So where a tool on this page checks one of those, it reports the official identifier, not one we invented. You can take a report from here straight to the specification and look the rule up. Where a rule is our own engineering judgement instead, it says so — and those carry our own prefixes.

What these tools deliberately do not do

They check shape, not substance. Whether a VAT rate is correct, whether an expense is deductible, whether your numbering satisfies your tax authority — those are questions for someone who can see your business, and no format checker can answer them.

Nor is EN 16931, the underlying EU standard, quoted here: it is a paid CEN standard this project does not hold. What is quoted is Peppol's own publicly readable restatement of the same business rules — the same discipline this site applies everywhere, which is to cite only documents a reader can actually open.

Looking for barcodes, listings or product feeds? Those live under e-commerce product data.