Validate XRechnung, ZUGFeRD and Factur-X locally in your browser

Open an XML or PDF invoice and check PDF/A, the hybrid container, XML Schema, EN 16931, XRechnung, ZUGFeRD profiles and invoice totals. Your file never leaves your device.

🔒 All processing runs locally in your browser. No data leaves your device.

Runs locally
No registration
Versioned standards packs
Downloadable reports

Drop a ZUGFeRD/Factur-X PDF or an XRechnung XML here, or click to select

.pdf or .xml — nothing is uploaded

Loads a synthetic, anonymized test invoice — not real data.

What you receive

Technical validation

PDF/A where applicable (PDF/A-3A, PDF/A-3B, PDF/A-3U)
PDF container and structure
ZUGFeRD/Factur-X hybrid container
XML security and well-formedness
XML Schema (XSD)
EN 16931 business rules
XRechnung CIUS rules
ZUGFeRD profile rules
Invoice arithmetic (line, tax and total amounts)

Readable invoice view

Seller and buyer
Line items
Taxes and totals
Payment information
References (order, contract, buyer reference)
Attachments
Raw XML
PDF metadata

Understandable findings

Which validation layer produced each finding
Rule ID
Severity (error, warning, incomplete)
XPath or technical location
Errors, warnings and incomplete checks are always kept separate — never merged or auto-interpreted

Local exports

Embedded XML
Normalized JSON
Line-item CSV
Validation JSON
HTML report
Text report

What is checked

Layer	Applies to	What the result means
PDF signature and structure	PDF only	The file is a well-formed PDF the tool can parse safely.
PDF/A conformance	PDF only — n/a for standalone XML	The declared PDF/A level (3A, 3B or 3U) is verified in full by the local veraPDF engine, with every failed rule listed.
ZUGFeRD/Factur-X container	PDF only — n/a for standalone XML	The embedded-file name tree, Catalog /AF array and attachment metadata correctly reference the invoice XML.
XML security	XML and embedded XML	The XML is checked against known hostile patterns (external entities, DTDs, XInclude) before further parsing.
XML well-formedness	XML and embedded XML	The document is syntactically valid XML.
XML Schema (XSD)	XML and embedded XML	The document matches the CII or UBL schema for its declared type.
EN 16931	XML and embedded XML	The invoice satisfies the European semantic data model's business rules.
XRechnung	XML and embedded XML	The invoice satisfies the German XRechnung CIUS rules on top of EN 16931.
ZUGFeRD profile	PDF (ZUGFeRD/Factur-X) only	The declared ZUGFeRD/Factur-X profile's own rule set is satisfied.
Invoice arithmetic	XML and embedded XML	Line, tax and total amounts are recomputed with exact decimals and must match the declared values.
PDF/XML consistency	PDF only — informational	A heuristic comparison between PDF text and XML values. This is an aid only, not a semantic or legal identity proof.

How it works

Open the file locally.
Detect format and profile.
Run the applicable technical checks.
Review readable invoice data and findings.
Download reports or extracted XML.

Private by design

Invoice bytes are read by the browser.
They are not sent to Konvi.ch or another validation server.
Static validation engines and standards packs are loaded from Konvi.ch.
Document processing begins only inside the browser.
Invoice content and validation results are not written to localStorage, sessionStorage or IndexedDB.
Closing or reloading the tab clears the current session.
Reports and extracted XML are generated locally when the user requests a download.

How can I verify this?

Open your browser's DevTools before loading a file. In the Network panel, only requests to konvi.ch for the page's own static application assets (scripts, engines, standards packs) appear — no request carries your invoice data, and no request goes to a third-party host. In the Application/Storage panel, localStorage, sessionStorage and IndexedDB stay empty of invoice content while you work. No document data is transmitted.

What validation statuses mean

Valid: Every mandatory applicable check completed successfully.
Valid with warnings: Mandatory checks passed, but non-blocking findings remain.
Invalid: Validation completed and at least one mandatory rule failed.
Incomplete: A required check could not run or did not finish. No complete technical verdict was issued.
Failed: An unexpected processing error prevented a trustworthy result.
Cancelled: The user stopped processing before completion.

Konvi performs technical validation against the displayed standards and rulesets. The result is not legal, tax or accounting advice and does not guarantee that an invoice will be accepted by every recipient or authority.

FAQ

Are my invoice files uploaded?

No. Everything runs locally in your browser; no invoice data is transmitted.

Which formats can I open?

Standalone XRechnung XML (CII or UBL) and ZUGFeRD/Factur-X PDF invoices with an embedded invoice XML.

Which checks are performed?

PDF/A (where applicable), the ZUGFeRD/Factur-X container, XML security and well-formedness, XML Schema, EN 16931, XRechnung, the ZUGFeRD profile, invoice arithmetic and an informational PDF/XML consistency check.

What is the difference between XRechnung, ZUGFeRD and Factur-X?

XRechnung is the German EN 16931 CIUS for invoices to public authorities. ZUGFeRD (Germany) and Factur-X (France) are hybrid PDF/XML formats sharing the same technical specification; a ZUGFeRD invoice only follows XRechnung when it declares the XRECHNUNG profile.

What does PDF/A validation mean?

The exact declared PDF/A level (3A, 3B or 3U) is validated in full by the local veraPDF engine; every failed rule is shown with its clause and context.

What does incomplete mean?

A required check could not run or did not finish, so no complete technical verdict was issued — this is different from invalid or failed.

Can I choose an older XRechnung ruleset?

Yes, when more than one standards pack is installed you can select and compare an older or newer XRechnung ruleset in the validation basis section.

Can I download the embedded XML?

Yes, from the Attachments tab and the export buttons.

Is the result legally binding?

No. Technical validation does not replace legal, tax or accounting advice.

Which browsers are supported?

Chromium, Firefox and WebKit-based browsers with WebAssembly support.

Does Konvi store my invoice?

No. Invoice content and validation results are never written to localStorage, sessionStorage or IndexedDB; closing or reloading the tab clears the session.

Can I verify the local processing myself?

Yes — use your browser's Network and Application/Storage panels; see “How can I verify this?” above.