
NormAPI
E-Rechnungs-Studio.de
E-Invoice.Space
Mustang Project
InvoiceIn
Invoice-Converter
Create, edit and view e-invoices online for free. Convert PDF to e-invoice, transform invoice XML to PDF, and generate UBL 2.1 with OCR scanning, EU VAT validation, and PEPPOL BIS 3.0 compliance.

CodeBeautify
XML ValidatorBuddy
Oxygen XML Editor
Altova XMLSpy
xmllint
Peppol Validator
Schema Validator Extension
Validate XML and e-invoices up to 1 GB in your browser: XSD, DTD, RelaxNG and official business rules

Which is more popular?
Website, pricing, platforms and company facts side by side.
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| Website | aidoks.eu | xmlvalid.com |
| Pricing | ||
| Platforms | — | |
| Company | Startup from Latvia · 2026 | Startup from Ukraine · 1 - 9 employees · 2026 |
| Listed in |
In their own words, as submitted to SaaSHub.


aiDoks is a European e-invoicing platform for small businesses and accountants. Generate compliant e-invoices in PEPPOL BIS 3.0, XRechnung (UBL & CII), Factur-X/ZUGFeRD PDF, Spanish Facturae and Estonian e-arve — or upload an existing PDF and let AI extraction fill the invoice for you....
xmlvalid is an online XML validator built for production-size documents and e-invoicing. Validation XSD 1.0, DTD, RelaxNG (XML and compact syntax) 7,700+ Schematron business rules: EN 16931 (UBL and CII), Peppol BIS and PINT, XRechnung, ZUGFeRD / Factur-X, and national rules from France, Italy,...
What each product offers, as listed by its team.


An editorial look at what each product does well and who it suits.


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As answered by people managing aiDoks.eu and xmlvalid.
aiDoks.eu's answer
aiDoks covers the whole EU e-invoicing workflow — generate, validate, and convert — in one free web tool, across formats that usually require separate tools: PEPPOL BIS 3.0, XRechnung (UBL & CII), Factur-X/ZUGFeRD, Spanish Facturae and Estonian e-arve. Validation runs the official schematron rule sets used by KoSIT, PEPPOL and national authorities, including country CIUS rules for Germany, France, Romania, the Netherlands, Portugal and Spain. And you can upload an existing PDF invoice and let AI extraction fill the e-invoice for you.
xmlvalid's answer:
aiDoks.eu's answer
Most free alternatives do one thing: a validator here, a ZUGFeRD library there — and many require signup, watermark the output, or assume developer skills. aiDoks is built for non-technical users: no signup for the first use, watermark-free XML, plain-language validation errors with rule IDs, and format conversion (PDF → e-invoice, CII ↔ UBL, Facturae → UBL, e-arve → UBL) that standalone validators don't offer. Pro is $4.85/month for unlimited use — a fraction of typical e-invoicing platform pricing.
xmlvalid's answer:
aiDoks.eu's answer
Small businesses, freelancers and accountants in Europe who need to send or check compliant e-invoices without an ERP system — especially in Germany, France, Belgium, Spain and Estonia, where e-invoicing mandates are already in force or arriving (France's B2B mandate starts 1 September 2026). Also useful for developers and consultants who need a quick validator against the official rule sets.
xmlvalid's answer:
aiDoks.eu's answer
Europe's e-invoicing mandates are rolling out country by country, but the tooling was built for large enterprises — small businesses were left choosing between expensive platforms and raw XML. aiDoks started as a simple free validator and grew into a full toolset: generators, validators and converters for every major European format, with AI-powered PDF extraction so nobody has to type an invoice twice. It's built in Latvia and available in seven European languages.
xmlvalid's answer:
xmlvalid is built and run by Oleksii Babintsev, a developer from Ukraine, so questions and bug reports reach the person who builds the engine. It started as a streaming validator for XML files too large for typical online tools, and grew into e-invoicing as countries made structured invoices mandatory: business rules for EN 16931, Peppol, XRechnung and national formats in 24 countries, PDF invoices, an API, CLI and GitHub Action for CI, and monitors for XML feeds. While building it, we found and fixed a slowdown in libxml2's validation of large files and contributed the fix upstream. It launched in October 2026
aiDoks.eu's answer
Java 21 with Spring Boot on the backend, Angular on the frontend, PostgreSQL for storage. Validation uses ph-schematron with the official EN 16931, PEPPOL, KoSIT and national CIUS rule sets. PDF invoice extraction is powered by Azure AI Document Intelligence.
xmlvalid's answer:
Share your experience with using aiDoks.eu and xmlvalid. For example, how are they different and which one is better?
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